tài liệu hệ thống điều hòa ford transit

412-00-1

Climate Control System - General Information

412-00-1

.

SECTION 412-00 Climate Control System - General
Information
VEHICLE APPLICATION:2007.50 Transit
CONTENTS

PAGE

SPECIFICATIONS
Specifications......................................................................................................................

412-00-2

DIAGNOSIS AND TESTING
Climate Control System......................................................................................................
Inspection and Testing........................................................................................................
Refrigerant Circuit - Quick Check.......................................................................................
Symptom chart...................................................................................................................
System Checks...................................................................................................................

412-00-3
412-00-3
412-00-3
412-00-4

412-00-6

GENERAL PROCEDURES
Spring Lock Coupling..........................................................................................................
Air Conditioning (A/C) Clutch Air Gap Adjustment.............................................................
Fluorescent Dye Leak Detection........................................................................................
Electronic Leak Detection...................................................................................................
Refrigerant Oil Adding........................................................................................................
Contaminated Refrigerant Handling...................................................................................
Air Conditioning (A/C) System Recovery, Evacuation and Charging.................................
Vacuum Leak Detection......................................................................................................

412-00-54
412-00-56
412-00-57
412-00-58
412-00-59
412-00-60
412-00-61
412-00-63


Climate Control System - General Information

412-00-2

412-00-2

SPECIFICATIONS
Lubricants, Fluids, Sealants and Adhesives

Item

Specification

Refrigerant R134a

WSH-M17B19-A

Refrigerant oil

WSH-M1C231-B

Refrigerant Capacities (When Charging)
Grams
A/C system

750 ± 20

A/C system with Auxiliary A/C system

1400 ± 34

Refrigerant Oil Capacities (When Charging)
millilitres
A/C system

280

A/C system with Auxiliary A/C system

640

Addition of Refrigerant Oil (When new components are installed)
CAUTIONS:
The refrigerant oil top-up quantity must not exceed the refrigerant oil fill quantity.
If other A/C components are being renewed in addition to the A/C compressor, there is no
need to top up with additional refrigerant oil, apart from filling the compressor.
millilitres
When all lines and components are replaced.

Add 280.

When all lines and components have been renewed (vehicles with additional
air conditioning).

Add 640.

Air conditioning (A/C) compressor - if the quantity of refrigerant oil drained
from the faulty compressor is less than 150 ml

Drain 50 from new
compressor.

Air conditioning compressor - if the amount of refrigerant oil drained from the
faulty compressor is more than 150 ml

Drain 0 from new
compressor.

Condenser

add 30.

Evaporator

add 30.

Accumulator/dehydrator

add 90.

Always, if refrigerant was drained.

Add the same quantity as
the quantity that was
collected.

Clutch air gap
mm
Compressor clutch air gap
Tightening Torques
Description
Compressor drive plate retaining bolt

2007.50 Transit 11/2006

0.35 - 0.85

Nm

lb-ft

lb-in

13

10

–

G509357en


Climate Control System - General Information

412-00-3

412-00-3

DIAGNOSIS AND TESTING

Climate Control System
Refer to Wiring Diagrams Section412-00,for
schematic and connector information.
Special Tool(s)
Terminal probe kit
418-S035

29011A

General Equipment
Digital Multimeter (compatible with K-type thermocouple)
Thermometer - Fluke 80 PK-8 (FSE number 260
4102 001 07)
Worldwide Diagnostic System (WDS)
Refrigerant center

RECTIFY any displayed faults in accordance
with the displayed fault description. CHECK the
operation of the system.
5. For vehicles with no stored fault(s), PROCEED
in accordance with the Symptom Chart
according to the fault symptom.
6. Following checking or elimination of the fault
and after completion of operations, the fault
memories of all vehicle modules must be READ
OUT and any stored faults must be DELETED.
READ OUT all fault memories again following
a road test.

Refrigerant Circuit - Quick Check
WARNING:The air conditioning system is
filled with R134a refrigerant. Observe
"Health and Safety Precautions". For
further information
REFER to:Health and Safety Precautions
(100-00 General Information, Description
and Operation).

Vacuum pump.

Vacuum gauge

Refrigerant circuit check

Inspection and Testing
1. Check customer concern.
2. Visually CHECK for any obvious mechanical or
electrical damage.
Visual Inspection
Mechanical
•
•
•
•
•
•
•

Refrigerant lines
Condenser
Drive belt
Coolant level
Coolant hoses
A/C compressor
Vacuum lines

Electrical
• Fuses
• Wiring harness
• Connector

3. RECTIFY any obvious causes for a concern
found during the visual inspection before
performing any further tests. CHECK the
operation of the system.
4. If the concern persists after the visual
inspection, PERFORM a fault diagnosis on the
electronic engine management with WDS and

2007.50 Transit 11/2006

WARNING:Under certain circumstances,
refrigerant lines and A/C components may
be extremely hot or cold. Exercising care,
touch the refrigerant lines or A/C
components in order to check this. Failure
to observe this instruction can lead to
injury.
• The refrigerant line from the refrigerant
compressor to the condenser must be hot.
• The refrigerant line from the A/C condenser to
the fixed orifice tube must be warm, but not so
hot as the refrigerant line mentioned above.
• Determine the difference in temperature
upstream and downstream of the A/C condenser
by measuring the temperatures. Depending on
the ambient temperature, the temperature
difference should be more than 20 °C. If the
temperature difference is less, check the
condenser for contamination or damage to the

fins as well as operation of the radiator fans.

G493484en


412-00-4

Climate Control System - General Information

412-00-4

DIAGNOSIS AND TESTING
• The refrigerant line between the fixed orifice
tube and the evaporator must be cold from the
point where the fixed orifice tube is installed.
Depending on the weather, the refrigerant line
may also have ice on its surface.
• The refrigerant line between the evaporator and
the A/C compressor including the dehydrator
must be cold.
Evaporator outlet temperature test

To test the power of the A/C system, the
temperature of the evaporator outlet line must be
measured. To do this, the following preconditions
must be met:
• Open all windows.
• Set the air distribution to the defrost/dashboard
position and open all the ventilation nozzles.
• DO NOT switch on recirculated air.

• Select lowest blower switch setting.
• Select lowest temperature setting.
NOTE:The temperature measurement cannot be
done with a thermometer which makes no contact.
False measurements may arise as a result of
surface reflections.
Connect the temperature sensor (Fluke 80 PK-8)
to the outlet line of the evaporator. The temperature
sensor must be positioned as closely as possible
to the evaporator. Connect the temperature sensor
to the multimeter.
Start the engine and allow it to run at idle speed
for several minutes.
Switch on the air-conditioning system.

If the measured temperature is 5 °C (vehicles with
additional air conditioning: 2 °C) or less then the
air conditioning system is OK. If the temperature
is higher, the A/C system may be under-filled.
Frequent faults and their causes

If the customer expresses concern about
insufficient cooling performance, ensure that the
temperature control is working properly.
• No or poor cooling performance:
– Blockage or narrowing of a refrigerant line or
in the dehydrator: The location of the
blockage or narrowing can easily be located
by temperature comparisons at the
refrigerant lines and the dehydrator. The

blockage or restriction is located at the point
where the temperature difference is
identified. Note: A difference in
temperature in the area of the fixed orifice
tube is normal. Once you have found the
location of the blockage or narrowing, check
the corresponding component and replace it
with a new one if required.
• Sudden drop in cooling performance (after the
air conditioning has been switched off for
approx. 5 minutes, the cooling performance
returns to normal):
– The cause is an iced-up fixed orifice tube
because of moisture in the refrigerant circuit.
In order to ensure that moisture is completely
removed from the refrigerant circuit, the
dehydrator should be renewed and the
evacuation time should be extended to 2-3
hours. For further information

After three minutes, measure the surface
temperature of the evaporator outlet line.

Symptom chart
Symptom chart
Symptom
• Blower faulty/inoperative

•
•

•
•
•
•
•

2007.50 Transit 11/2006

Possible Sources
Fuse(s)
Circuit(s)
Blower motor
Blower switch
Blower resistor assembly
Blower relay, programmable
fuel-fired booster heater
Blower relay, air conditioning

Action
• GO to Pinpoint Test A.

G493484en


412-00-5

Climate Control System - General Information

412-00-5

DIAGNOSIS AND TESTING
Symptom
Possible Sources
• Additional blower motor faulty • Fuse(s)
/ inoperative
• Circuit(s)
• Additional blower motor
• Additional blower switch
• Additional blower resistor
• Air conditioning inoperative blower function OK

Action
• GO to Pinpoint Test B.

•
•
•
•
•

Fuse(s)
• GO to Pinpoint Test C.
Circuit(s)
Air conditioning clutch
Air conditioning clutch relay
Refrigerant high pressure
switch
• Powertrain control module
(PCM)
• Refrigerant low pressure switch

• Air conditioning control
assembly

• Refrigerant compressor inoper- • Circuit(s)
ative in "defrost" air distribution • Mechanical actuation of the
setting (function of air condidefrost switch
tioning OK)
• Defrost switch

• GO to Pinpoint Test D.

• Blower does not run automatic- • Circuit(s)
ally when the air conditioning • Blower relay, air conditioning
is switched on - vehicles with
air conditioning

• GO to Pinpoint Test E.

• Temperature control inoper• Circuit(s)
• GO to Pinpoint Test F.
ative - vehicles with air condi- • Temperature control potentioning (function of the air
tiometer
conditioning OK)
• Temperature control flap actuator
• Temperature control flap
• Air conditioning control
assembly
• Air distribution flap actuator for • Fuse(s)
• GO to Pinpoint Test G.
additional heater inoperative • Circuit(s)

(operation of additional blower • Actuator – additional heater air
motor OK)
distribution flap
• Additional heater control
assembly
• The temperature control is
inoperative when the additional
heater control assembly is
used.

•
•
•
•

Fuse(s)
• GO to Pinpoint Test H.
Circuit(s)
Additional heater control valve
Additional heater control valve
module
• Additional heater control
assembly

• Recirculated air flap inoperative • Vacuum line(s).
• GO to Pinpoint Test I.
• Actuator – recirculated air flap
• Climate control system control
assembly

2007.50 Transit 11/2006

G493484en


412-00-6

Climate Control System - General Information

412-00-6

DIAGNOSIS AND TESTING
Symptom
• No heating power

•
•
•
•
•
•

Possible Sources
Action
Cooling system
• GO to Pinpoint Test J.
Vacuum line(s).
Circuit(s)
Coolant shut-off valve
Solenoid valve, coolant shut-off

valve
Solenoid valve switch, coolant
shut-off valve

System Checks
PINPOINT TEST A : BLOWER FAULTY/INOPERATIVE
TEST CONDITIONS
DETAILS/RESULTS/ACTIONS
A1: CHECK ALL SPEED SETTINGS OF THE BLOWER MOTOR
1 Ignition switch in position II.
2 Switch the blower switch through all speed
settings.
• Is the blower motor inoperative in all the switch
positions?

→ Yes
GO to A2.

→ No
- The blower motor is inoperative in switch
position 1 and/or 2:
GO to A9.
- The blower motor is only inoperative in
switch position 3:
GO to A8.
A2: CHECK FUSE F55
1 Ignition switch in position 0.
2 CHECK Fuse F55 (standard relay box).
• Is the fuse OK?

→ Yes
GO to A3.

→ No
INSTALL A NEW fuse F55 (40 A). CHECK
the operation of the system. If the fuse blows
again, LOCATE and REPAIR the short using
the Wiring Diagrams.
A3: CHECK THE VOLTAGE AT FUSE F55
1 Connect Fuse F55 (standard relay box).
2 Ignition switch in position II.

2007.50 Transit 11/2006

G493484en


412-00-7

Climate Control System - General Information

412-00-7

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
3 Measure the voltage between fuse F55 and
ground.
• Does the meter display battery voltage?

→ Yes
GO to A4.

→ No
REPAIR the voltage supply to fuse F55 with
the aid of the Wiring Diagrams. CHECK the
operation of the system.
A4: CHECK VOLTAGE AT BLOWER MOTOR
1 Ignition switch in position 0.
2 Disconnect Connector CH123 from the blower
motor.
3 Ignition switch in position II.
4 Measure the voltage between the blower motor,
connector CH123, pin 1, circuit CB155J
(YE/RD), wiring harness side and ground.
• Does the meter display battery voltage?

→ Yes

E54403

- All except vehicles with programmable fuelfired booster heater:
GO to A5.
- Vehicles with programmable fuel-fired
booster heater:
GO to A19.

→ No
- All except vehicles with programmable fuelfired booster heater:

LOCATE and REPAIR the break in the circuit
between the blower motor and fuse F55 using
the Wiring Diagrams. CHECK the operation
of the system.
- Vehicles with programmable fuel-fired
booster heater:
GO to A14.
A5: CHECK GROUND CONNECTION OF BLOWER MOTOR
1 Ignition switch in position 0.
2 Set the blower switch to level 3.

2007.50 Transit 11/2006

G493484en


412-00-8

Climate Control System - General Information

412-00-8

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
3 Measure the resistance between the blower
motor, connector CH123, pin 2, circuit VH301B
(YE/BU), wiring harness side and ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
RENEW the blower motor. CHECK the operation of the system.
E54404

→ No
GO to A6.

A6: CHECK THE GROUND CONNECTION OF THE BLOWER SWITCH
1 Disconnect Connector CH101B from the blower
switch.
2 Measure the resistance between the blower
switch, connector CH101B, pin 4, circuit
GD115F (BK/RD), wiring harness side and
ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A7.

→ No
VFE0016022

LOCATE and REPAIR the break in the circuit
between the blower switch and ground
connection GP15 using the Wiring Diagrams.
CHECK the operation of the system.

A7: CHECK CIRCUIT BETWEEN THE BLOWER MOTOR AND THE BLOWER SWITCH FOR OPEN
CIRCUIT

1 Measure the resistance between the blower
motor, connector CH123, pin 2, circuit VH301B
(YE/BU), wiring harness side and the blower
switch, connector CH101B, pin 2, circuit
VH301A (YE/BU), wiring harness side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
RENEW the blower switch. CHECK the operation of the system.
VFE0033621

→ No
LOCATE and REPAIR the break in circuit
VH301B (YE/BU) between the blower motor
and soldered connection S2H301 using the
Wiring Diagrams. CHECK the operation of the
system.

2007.50 Transit 11/2006

G493484en


412-00-9

Climate Control System - General Information

412-00-9

DIAGNOSIS AND TESTING

TEST CONDITIONS
DETAILS/RESULTS/ACTIONS
A8: CHECK THE CIRCUIT BETWEEN THE BLOWER MOTOR AND THE BLOWER SWITCH FOR
OPEN CIRCUIT - LEVEL 3 INOPERATIVE
1 Ignition switch in position 0.
2 Disconnect Connector CH123 from the blower
motor.
3 Disconnect Connector CH101B from the blower
switch.
4 Measure the resistance between the blower
motor, connector CH123, pin 2, circuit VH301B
(YE/BU), wiring harness side and the blower
switch, connector CH101B, pin 2, circuit
VH301A (YE/BU), wiring harness side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
RENEW the blower switch. CHECK the operation of the system.
VFE0033621

→ No
LOCATE and REPAIR the break in circuit
VH301A (YE/BU) between soldered connection S2H301 and the blower switch using the
Wiring Diagrams. CHECK the operation of the
system.

A9: MEASURE THE VOLTAGE AT THE BLOWER RESISTOR ASSEMBLY
1 Ignition switch in position 0.
2 Disconnect Connector CH403 from the blower
resistor assembly.

3 Ignition switch in position II.
4 Measure the resistance between the blower
resistor assembly, connector CH403, pin 1,
circuit VH301C (YE/BU), wiring harness side
and ground.
• Does the meter display battery voltage?

→ Yes
INSTALL a new heater blower series resistor.
CHECK the operation of the system.

→ No
VFE0023419

LOCATE and REPAIR the break in circuit
VH301C (YE/BU) between soldered connection S2H301 and the blower resistor assembly
using the Wiring Diagrams. CHECK the operation of the system.

A10: CHECK THE GROUND CONNECTION OF BLOWER RESISTOR ASSEMBLY - LEVEL 1
1 Ignition switch in position 0.

2007.50 Transit 11/2006

G493484en


412-00-10

Climate Control System - General Information

412-00-10

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
2 Set the blower switch to level 1.
3 Measure the resistance between the blower
resistor assembly, connector CH403, pin 2,
circuit CH427C (BN), wiring harness side and
ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A12.

→ No
GO to A11.
VFE0008570

A11: CHECK THE CIRCUIT BETWEEN THE BLOWER RESISTOR ASSEMBLY AND THE BLOWER
SWITCH FOR OPEN CIRCUIT - LEVEL 1
1 Disconnect Connector CH101B from the blower
switch.
2 Measure the resistance between the blower
resistor assembly, connector CH403, pin 2,
circuit CH427C (BN), wiring harness side and
the blower switch, connector CH101B, pin 3,
circuit CH427B (BN), wiring harness side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
RENEW the blower switch. CHECK the operation of the system.
VFE0033622

→ No
LOCATE and REPAIR the break in the circuit
between the blower switch and the blower
resistor assembly using the Wiring Diagrams.
CHECK the operation of the system.

A12: CHECK THE GROUND CONNECTION OF BLOWER RESISTOR ASSEMBLY - LEVEL 2
1 Set the blower switch to level 2.
2 Measure the resistance between the blower
resistor assembly, connector CH403, pin 4,
circuit CH428A (GN/WH), wiring harness side
and ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
INSTALL a new heater blower series resistor.
CHECK the operation of the system.

→ No
VFE0009221

2007.50 Transit 11/2006

GO to A13.

G493484en


412-00-11

Climate Control System - General Information

412-00-11

DIAGNOSIS AND TESTING
TEST CONDITIONS
DETAILS/RESULTS/ACTIONS
A13: CHECK THE CIRCUIT BETWEEN THE BLOWER RESISTOR ASSEMBLY AND THE BLOWER
SWITCH FOR OPEN CIRCUIT - LEVEL 2
1 Disconnect Connector CH101B from the blower
switch.
2 Measure the resistance between the blower
resistor assembly, connector CH403, pin 4,
circuit CH428A (GN/WH), wiring harness side
and the blower switch, connector CH101B, pin
1, circuit CH428A (GN/WH), wiring harness side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
RENEW the blower switch. CHECK the operation of the system.
VFE0034284

→ No
LOCATE and REPAIR the break in circuit
CH428A (GN/WH) between the blower switch

and the blower resistor assembly using the
Wiring Diagrams. CHECK the operation of the
system.

A14: CHECK THE BLOWER MOTOR CIRCUIT
1 Ignition switch in position 0.
2 DisconnectBlower relay for the programmable
fuel-fired booster heater from socket CH402A.
3 Use a fused test cable (5 A) to bridge the blower
relay of the programmable fuel-fired booster
heater, socket CH402A, between pin 4, circuit
CB155G (BN/BU), wiring harness side and pin
1, circuit CB155F (BN/BU), wiring harness side.

VFE0013150

4 Ignition switch in position II.

2007.50 Transit 11/2006

G493484en


412-00-12

Climate Control System - General Information

412-00-12

DIAGNOSIS AND TESTING

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
5 Measure the voltage between the blower motor,
connector CH123, pin 1, circuit CB155A
(BN/BU), wiring harness side and ground.
• Does the meter display battery voltage?

→ Yes
GO to A17.

→ No
GO to A15.
E54403

A15: CHECK THE VOLTAGE AT THE BLOWER RELAY OF THE PROGRAMMABLE FUEL-FIRED
BOOSTER HEATER
1 Measure the voltage between the blower relay
of the programmable fuel-fired booster heater,
socket CH402A, pin 4, circuit CB154G (VT/OG)
(vehicles without air conditioning: circuit
CB154C (VT/OG)), wiring harness side and
ground.
• Does the meter display battery voltage?

→ Yes
LOCATE and REPAIR the break in the circuit
between the blower relay for the programmable fuel-fired booster heater and the blower
motor with the aid of the Wiring Diagrams.
CHECK the operation of the system.

→ No
GO to A16.
A16: CHECK THE CIRCUIT BETWEEN THE BLOWER RELAY OF THE PROGRAMMABLE FUELFIRED BOOSTER HEATER AND THE PROGRAMMABLE FUEL-FIRED BOOSTER HEATER RELAY
FOR OPEN CIRCUIT
1 Ignition switch in position 0.
2 Disconnect Relay R16.

2007.50 Transit 11/2006

G493484en


412-00-13

Climate Control System - General Information

412-00-13

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
3 Measure the resistance between the blower
relay of the programmable fuel-fired booster
heater, socket CH402A, pin 4, circuit CB154G
(VT/OG) (vehicles without air conditioning:
circuit CB154C (VT/OG)), wiring harness side
and the programmable fuel-fired booster heater
relay, pin 5, circuit CB154A (VT/OG), wiring

harness side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
CHECK and if necessary RENEW the fuelfired booster heater relay. CHECK the operation of the system.

→ No
LOCATE and REPAIR the break in the circuit
between the blower relay for the programmable fuel-fired booster heater and the
programmable fuel-fired booster heater relay
using the Wiring Diagrams. CHECK the operation of the system.
A17: CHECK THE VOLTAGE AT THE BLOWER RELAY OF THE PROGRAMMABLE FUEL-FIRED
BOOSTER HEATER
1 Measure the voltage between the blower relay
of the programmable fuel-fired booster heater,
socket CH402A, pin 3, circuit CB150P (YE/OG)
(vehicles without air conditioning: circuit
CB155G (BN/BU)), wiring harness side and
ground.
• Does the meter display battery voltage?

→ Yes
GO to A18.

→ No
LOCATE and RECTIFY the break in the circuit
between the blower relay of the programmable
fuel-fired booster heater and soldered
connection S2B150B (vehicles without air
conditioning: soldered connection S2B155)

using the Wiring Diagrams. CHECK the operation of the system.
A18: CHECK THE GROUND CONNECTION OF THE BLOWER RELAY FOR THE PROGRAMMABLE
FUEL-FIRED BOOSTER HEATER
1 Ignition switch in position 0.

2007.50 Transit 11/2006

G493484en


412-00-14

Climate Control System - General Information

412-00-14

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
2 Measure the resistance between the blower
relay of the programmable fuel-fired booster
heater, socket CH402A, pin 2, circuit GD115P
(BK/GY) (vehicles without air conditioning: circuit
GD115D (BK/GY)), wiring harness side and
ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
RENEW the blower relay for the programmable fuel-fired booster heater CHECK the

operation of the system.

→ No
LOCATE and RECTIFY the break in circuit
GD115P (BK/RD) (vehicles without air conditioning: circuit GD115D (BK/GY)) between the
blower relay for the programmable fuel-fired
booster heater and ground connection GP15
with the aid of the Wiring Diagrams. CHECK
the operation of the system.
A19: CHECK GROUND CONNECTION OF BLOWER MOTOR
1 Set the blower switch to level 3.
2 Measure the resistance between the blower
motor, connector CH123, pin 2, circuit VH301B
(YE/BU), wiring harness side and ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
RENEW the blower motor. CHECK the operation of the system.
E54404

→ No
- Vehicles with air conditioning:
GO to A20. ,
- Vehicles without air conditioning:
GO to A21.

A20: CHECK BLOWER SWITCH
1 Ignition switch in position 0.
2 Disconnect Connector CH101B from the blower
switch.

3 Set the blower switch to position 3.

2007.50 Transit 11/2006

G493484en


412-00-15

Climate Control System - General Information

412-00-15

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
4 Measure the resistance at the blower switch,
connector CH101B, between pin 2 and pin 4,
component side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A22.

→ No
RENEW the blower switch. CHECK the operation of the system.

A21: CHECK BLOWER SWITCH
1 Ignition switch in position 0.

2 Disconnect Connector CH426B from the blower
switch.
3 Set the blower switch to position 3.
4 Measure the resistance at the blower switch,
connector CH426B, between pin 2 and pin 4,
component side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A23.

→ No
RENEW the blower switch. CHECK the operation of the system.

A22: CHECK CIRCUIT BETWEEN THE BLOWER MOTOR AND THE BLOWER SWITCH FOR OPEN
CIRCUIT
1 Measure the resistance between the blower
motor, connector CH123, pin 2, circuit VH301B
(YE/BU), wiring harness side and the blower
switch, connector CH101B, pin 2, circuit
VH301A (YE/BU), wiring harness side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A24.

→ No
LOCATE and REPAIR the break in circuit
VH301B (YE/BU) between the blower motor
and soldered connection S2H301 using the

Wiring Diagrams. CHECK the operation of the
system.

2007.50 Transit 11/2006

G493484en


412-00-16

Climate Control System - General Information

412-00-16

DIAGNOSIS AND TESTING
TEST CONDITIONS
DETAILS/RESULTS/ACTIONS
A23: CHECK CIRCUIT BETWEEN THE BLOWER MOTOR AND THE BLOWER SWITCH FOR OPEN
CIRCUIT
1 Measure the resistance between the blower
motor, connector CH123, pin 2, circuit VH301B
(YE/BU), wiring harness side and the blower
switch, connector CH426B, pin 2, circuit
VH301A (YE/BU), wiring harness side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A25.

→ No

VFE0033621

LOCATE and REPAIR the break in circuit
VH301B (YE/BU) between the blower motor
and soldered connection S2H301 using the
Wiring Diagrams. CHECK the operation of the
system.

A24: CHECK CIRCUIT BETWEEN THE BLOWER MOTOR AND THE BLOWER SWITCH FOR OPEN
CIRCUIT
1 Measure the resistance between the blower
motor, connector CH123, pin 2, circuit VH301B
(YE/BU), wiring harness side and the blower
switch, connector CH101B, pin 2, circuit
VH301A (YE/BU), wiring harness side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A26.

→ No
LOCATE and REPAIR the break in circuit
VH301B (YE/BU) between the blower motor
and soldered connection S2H301 using the
Wiring Diagrams. CHECK the operation of the
system.
A25: CHECK THE CIRCUIT BETWEEN THE BLOWER SWITCH AND THE AIR CONDITIONING
BLOWER RELAY FOR OPEN CIRCUIT
1 Disconnect A/C blower relay from socket
CH402B.

2007.50 Transit 11/2006

G493484en


412-00-17

Climate Control System - General Information

412-00-17

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
2 Measure the resistance between the blower
switch, connector CH426B, pin 4, circuit
GD115A (BK/GY), wiring harness side and the
A/C blower relay, socket CH402B, pin 5, circuit
GD115A (BK/GY), wiring harness side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A27.

→ No
LOCATE and REPAIR the break in circuit
GD115A (BK/GY) between the blower switch
and the A/C blower relay with the aid of the

Wiring Diagrams. CHECK the operation of the
system.
A26: CHECK THE CIRCUIT BETWEEN THE BLOWER SWITCH AND THE AIR CONDITIONING
BLOWER RELAY FOR OPEN CIRCUIT
1 Disconnect A/C blower relay from socket
CH402B.
2 Measure the resistance between the blower
switch, connector CH101B, pin 4, circuit
GD115A (BK/GY), wiring harness side and the
A/C blower relay, socket CH402B, pin 4, circuit
GD115B (BK/GY), wiring harness side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A28.

→ No
LOCATE and REPAIR the break in circuit
GD115A (BK/GY) between the blower switch
and the A/C blower relay with the aid of the
Wiring Diagrams. CHECK the operation of the
system.
A27: CHECK THE GROUND CONNECTION OF THE A/C BLOWER RELAY
1 Measure the resistance between the A/C blower
relay, socket CH405B, pin 1, circuit GD115R
(BK/RD), wiring harness side and ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A29.

→ No
VFE0025841

2007.50 Transit 11/2006

LOCATE and REPAIR the break in circuit
GD115R (BK/RD) between the air conditioning
blower relay and soldered connection
S2D115C with the aid of the Wiring Diagrams.
CHECK the operation of the system.

G493484en


412-00-18

Climate Control System - General Information

412-00-18

DIAGNOSIS AND TESTING
TEST CONDITIONS
DETAILS/RESULTS/ACTIONS
A28: CHECK THE GROUND CONNECTION OF THE A/C BLOWER RELAY
1 Measure the resistance between the A/C blower
relay, socket CH405B, pin 1, circuit GD115U
(BK/RD), wiring harness side and ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A30.

→ No
LOCATE and REPAIR the break in circuit
GD115U (BK/RD) between the A/C blower
relay and soldered connection S2D115C with
the aid of the Wiring Diagrams. CHECK the
operation of the system.
A29: CHECK THE GROUND CONNECTION OF THE A/C BLOWER RELAY
1 Measure the resistance between the A/C blower
relay, socket CH402B, pin 2, circuit GD115Q
(BK/RD), wiring harness side and ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A32.

→ No
LOCATE and REPAIR the break in circuit
GD115Q (BK/RD) between the air conditioning
blower relay and soldered connection
S2D115C with the aid of the Wiring Diagrams.
CHECK the operation of the system.
A30: CHECK THE GROUND CONNECTION OF THE A/C BLOWER RELAY
1 Measure the resistance between the A/C blower
relay, socket CH402B, pin 2, circuit GD115Q
(BK/RD), wiring harness side and ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to A31.

→ No
LOCATE and REPAIR the break in circuit
GD115Q (BK/RD) between the air conditioning
blower relay and soldered connection
S2D115C with the aid of the Wiring Diagrams.
CHECK the operation of the system.
A31: CHECK THE VOLTAGE AT THE AIR CONDITIONING BLOWER RELAY - PIN 1
1 Ignition switch in position II.

2007.50 Transit 11/2006

G493484en


412-00-19

Climate Control System - General Information

412-00-19

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
2 Measure the voltage between the A/C blower
relay, socket CH402B, pin 1, circuit CB154E
(VT/OG), wiring harness side and ground.

• Does the meter display battery voltage?

→ Yes
RENEW the air conditioning blower relay.
CHECK the operation of the system.

→ No
LOCATE and REPAIR the break in circuit
CB154E (VT/OG) between the A/C blower
relay and soldered connection S2B154 with
the aid of the Wiring Diagrams. CHECK the
operation of the system.
A32: CHECK THE VOLTAGE AT THE AIR CONDITIONING BLOWER RELAY - PIN 1
1 Ignition switch in position II.
2 Measure the voltage between the A/C blower
relay, socket CH402B, pin 3, circuit CB155E
(YE/RD), wiring harness side and ground.
• Does the meter display battery voltage?

→ Yes
RENEW the air conditioning blower relay.
CHECK the operation of the system.

→ No
VFE0015922

LOCATE and REPAIR the break in circuit
CB155E (YE/RD) between the air conditioning
blower relay and soldered connection S2B155
with the aid of the Wiring Diagrams. CHECK

the operation of the system.

PINPOINT TEST B : ADDITIONAL BLOWER MOTOR FAULTY / INOPERATIVE
TEST CONDITIONS
DETAILS/RESULTS/ACTIONS
B1: CHECK ALL SPEED SETTINGS OF THE ADDITIONAL BLOWER MOTOR
1 Ignition switch in position II.

2007.50 Transit 11/2006

G493484en


412-00-20

Climate Control System - General Information

412-00-20

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
2 Switch the additional blower motor switch
through all settings.
• Is the additional blower motor inoperative in
all the switch positions?

→ Yes
GO to B2.

→ No
- The additional blower motor is inoperative
in switch position 1, 2 and/or 3:
GO to B9.
- The additional blower motor is only inoperative in switch position 4:
GO to B8.
B2: CHECK FUSE F57
1 Ignition switch in position 0.
2 CHECK Fuse F57 (standard relay box).
• Is the fuse OK?

→ Yes
GO to B3.

→ No
RENEW fuse F57 (30 A). CHECK the operation of the system. If the fuse blows again,
LOCATE and REPAIR the short using the
Wiring Diagrams.
B3: CHECK THE VOLTAGE AT FUSE F57
1 Connect Fuse F57 (standard relay box).
2 Ignition switch in position II.
3 Measure the voltage between fuse F57 and
ground.
• Does the meter display battery voltage?

→ Yes
GO to B4.

→ No

REPAIR the voltage supply to fuse F57 with
the aid of the Wiring Diagrams. CHECK the
operation of the system.
B4: CHECK THE VOLTAGE AT THE ADDITIONAL BLOWER MOTOR
1 Ignition switch in position 0.
2 Disconnect Connector CH123R from the additional blower motor.
3 Ignition switch in position II.

2007.50 Transit 11/2006

G493484en


412-00-21

Climate Control System - General Information

412-00-21

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
4 Measure the voltage between the additional
blower motor, connector CH123R, pin 1, circuit
CB157D (BN/GN), wiring harness side and
ground.
• Does the meter display battery voltage?

→ Yes

GO to B5.

→ No
LOCATE and REPAIR the break in the circuit
between the additional blower motor and fuse
F57 using the Wiring Diagrams. CHECK the
operation of the system.
B5: CHECK THE GROUND CONNECTION OF THE ADDITIONAL BLOWER MOTOR
1 Ignition switch in position 0.
2 Set the additional blower switch to position 4.
3 Measure the resistance between the additional
blower motor, connector CH123R, pin 2, circuit
CHA08A (GN/OG), wiring harness side and
ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
RENEW the additional blower motor. CHECK
the operation of the system.

→ No
VFE0013703

GO to B6.

B6: CHECK THE GROUND CONNECTION OF THE ADDITIONAL BLOWER SWITCH
1 Disconnect Connector CHA05A from the additional blower switch.
2 Measure the resistance between the additional
blower switch, connector CHA05A, pin 1, circuit
GD149H (BK/GY), wiring harness side and

ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to B7.

→ No
VFE0034286

2007.50 Transit 11/2006

LOCATE and RECTIFY the break in the circuit
between the additional blower switch and
ground connection GP49 using the Wiring
Diagrams. CHECK the operation of the
system.

G493484en


412-00-22

Climate Control System - General Information

412-00-22

DIAGNOSIS AND TESTING
TEST CONDITIONS
DETAILS/RESULTS/ACTIONS
B7: CHECK THE CIRCUIT BETWEEN THE ADDITIONAL BLOWER MOTOR AND THE ADDITIONAL

BLOWER SWITCH FOR OPEN CIRCUIT
1 Measure the resistance between the additional
blower motor, connector CH123R, pin 2, circuit
CHA08A (GN/OG), wiring harness side and the
additional blower switch, connector CHA05A,
pin 6, circuit CHA08F (GN/OG), wiring harness
side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
VFE0034285

RENEW the additional blower switch. CHECK
the operation of the system.

→ No
LOCATE and REPAIR the break in the circuit
between the additional blower motor and
soldered connection S4HA08 with the aid of
the Wiring Diagrams. CHECK the operation
of the system.
B8: CHECK THE CIRCUIT BETWEEN THE ADDITIONAL BLOWER MOTOR AND THE ADDITIONAL
BLOWER SWITCH FOR OPEN CIRCUIT - LEVEL 4 INOPERATIVE
1 Ignition switch in position 0.
2 Disconnect Connector CH123R from the additional blower motor.
3 Disconnect Connector CHA05A from the additional blower switch.
4 Measure the resistance between the additional
blower motor, connector CH123R, pin 2, circuit
CHA08A (GN/OG), wiring harness side and the
additional blower switch, connector CHA05A,

pin 6, circuit CHA08F (GN/OG), wiring harness
side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
VFE0034285

RENEW the additional blower switch. CHECK
the operation of the system.

→ No
LOCATE and REPAIR the break in the circuit
between soldered connection S4HA08 and
the additional blower switch with the aid of the
Wiring Diagrams. CHECK the operation of the
system.
B9: CHECK THE VOLTAGE AT THE ADDITIONAL BLOWER RESISTOR
1 Ignition switch in position 0.

2007.50 Transit 11/2006

G493484en


412-00-23

Climate Control System - General Information

412-00-23

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
2 Disconnect Connector CHA04 from the additional
blower resistor.
3 Ignition switch in position II.
4 Measure the voltage between the additional
blower resistor, connector CHA04, pin 4, circuit
CHA08B (GN/OG), wiring harness side and
ground.
• Does the meter display battery voltage?

→ Yes
GO to B10.

→ No
VFE0034288

LOCATE and REPAIR the break in the circuit
between soldered connection S4HA08 and
the additional blower resistor with the aid of
the Wiring Diagrams. CHECK the operation
of the system.

B10: CHECK THE GROUND CONNECTION OF THE ADDITIONAL BLOWER RESISTOR - LEVEL
1
1 Ignition switch in position 0.
2 Set the additional blower switch to level 1.
3 Measure the resistance between the additional

blower resistor, connector CHA04, pin 3, circuit
CHA06D (YE/VT), wiring harness side and
ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
GO to B12.

→ No
GO to B11.

B11: CHECK THE CIRCUIT BETWEEN THE ADDITIONAL BLOWER SWITCH AND THE ADDITIONAL
BLOWER RESISTOR FOR OPEN CIRCUIT
1 Disconnect Connector CHA05A from the additional blower switch.

2007.50 Transit 11/2006

G493484en


412-00-24

Climate Control System - General Information

412-00-24

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

2 Measure the resistance between the additional
blower switch, connector CHA05A, pin 2, circuit
CHA06A (YE/VT), wiring harness side and the
additional blower resistor, connector CHA04,
pin 3, circuit CHA06D (YE/VT), wiring harness
side.
• Is a resistance of less than 2 Ohms registered?

→ Yes
E69699

RENEW the additional blower switch. CHECK
the operation of the system.

→ No
LOCATE and REPAIR the break in the circuit
between the additional blower switch and the
additional blower resistor with the aid of the
Wiring Diagrams. CHECK the operation of the
system.
B12: CHECK THE GROUND CONNECTION OF THE ADDITIONAL BLOWER RESISTOR - LEVEL
2
1 Set the additional blower switch to level 2.
2 Measure the resistance between the additional
blower resistor, connector CHA04, pin 1, circuit
ZA345A (OG/GY), wiring harness side and
ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes

GO to B14.

→ No
GO to B13.

B13: CHECK THE CIRCUIT BETWEEN THE ADDITIONAL BLOWER SWITCH AND THE ADDITIONAL
BLOWER RESISTOR FOR OPEN CIRCUIT
1 Disconnect Connector CHA05A from the additional blower switch.

2007.50 Transit 11/2006

G493484en


412-00-25

Climate Control System - General Information

412-00-25

DIAGNOSIS AND TESTING
TEST CONDITIONS

DETAILS/RESULTS/ACTIONS
2 Measure the resistance between the additional
blower switch, connector CHA05A, pin 3, circuit
ZA345D (OG/GY), wiring harness side and the
additional blower resistor, connector CHA04,
pin 1, circuit ZA345A (OG/GY), wiring harness
side.

• Is a resistance of less than 2 Ohms registered?

→ Yes
RENEW the additional blower switch. CHECK
the operation of the system.

→ No
LOCATE and REPAIR the break in the circuit
between the additional blower switch and the
additional blower resistor with the aid of the
Wiring Diagrams. CHECK the operation of the
system.
B14: CHECK THE GROUND CONNECTION OF THE ADDITIONAL BLOWER RESISTOR - LEVEL
3
1 Set the additional blower switch to level 3.
2 Measure the resistance between the additional
blower resistor, connector CHA04, pin 2, circuit
CHA07D (BU/GY), wiring harness side and
ground.
• Is a resistance of less than 2 Ohms registered?

→ Yes
RENEW the additional blower resistor.
CHECK the operation of the system.

→ No
GO to B15.
B15: CHECK THE CIRCUIT BETWEEN THE ADDITIONAL BLOWER SWITCH AND THE ADDITIONAL
BLOWER RESISTOR FOR OPEN CIRCUIT
1 Disconnect Connector CHA05A from the additional blower switch.

2007.50 Transit 11/2006

G493484en