Ford Galaxy / Ford S-MAX. Manual — part 636

Measure the voltage between A/C clutch relay
H401, socket C1BB03-A, pin 28, circuit SBB13A

(RD), wiring harness side and ground.

1

Does the meter display battery voltage?
Yes

- All except vehicles with a 2.5L engine:

GO to E7

.

- Vehicles with a 2.5L engine

GO to E8

.

No

LOCATE and RECTIFY the break in circuit SBB13A
(RD) between fuse F13 and A/C clutch relay H401
with the aid of the Wiring Diagrams. CHECK the
operation of the system.

E7: CHECK THE VOLTAGE AT THE A/C CLUTCH - ALL EXCEPT VEHICLES WITH A 2.5L
ENGINE

Disconnect Connector C1H302-C from the A/C
clutch.

1

Use a fused test cable (15 A) to bridge A/C clutch
relay H401, socket C1BB03-A, pin 28 and pin 29,

wiring harness side.

2

Measure the voltage between the A/C clutch,
connector C1H302-C, pin 1, circuit CH401A

(VT/WH), wiring harness side and ground.

3

Does the meter display battery voltage?
Yes

GO to E10

.

No

GO to E9

.

E8: CHECK THE VOLTAGE AT THE A/C CLUTCH - VEHICLES WITH A 2.5L ENGINE

Disconnect Connector C1H302-A from the A/C
clutch.

1

Use a fused test cable (15 A) to bridge A/C clutch
relay H401, socket C1BB03-A, pin 28 and pin 29,

wiring harness side.

2

Measure the voltage between the A/C clutch,
connector C1H302-A, pin 1, circuit CH401A

(VT/WH), wiring harness side and ground.

3

Does the meter display battery voltage?
Yes

CHECK the mounting of the refrigerant compressor.
If the component is securely attached, RENEW the
A/C clutch. CHECK the operation of the system.

No

GO to E9

.

E9: CHECK THE CIRCUIT BETWEEN THE A/C CLUTCH AND THE EJB FOR OPEN CIRCUIT

Disconnect Connector C1BB03-A from the EJB.

1

Measure the resistance between the A/C clutch,
connector C1H302-C (vehicles with a 2.5L engine:

connector C1H302-A), pin 1, circuit CH401A
(VT/WH), wiring harness side and the EJB,
connector C1BB03-A, pin 29, circuit CH401A
(VT/WH), wiring harness side.

2

Is a resistance of less than 2 Ohms registered?
Yes

LOCATE and RECTIFY the break in circuit CH401A
(VT/WH) between the EJB and A/C clutch relay
H401 with the aid of the Wiring Diagrams. CHECK
the operation of the system.

No

LOCATE and RECTIFY the break in circuit CH401A
(VT/WH) between the EJB and the A/C clutch with
the aid of the Wiring Diagrams. CHECK the
operation of the system.

E10: CHECK THE GROUND CONNECTION OF THE A/C CLUTCH

Measure the resistance between the A/C clutch,
connector C1H302-C, pin 2, circuit GN129D

(BK/YE), wiring harness side and ground.

1

Is a resistance of less than 2 Ohms registered?
Yes

RENEW the air conditioning clutch. CHECK the
operation of the system.

No

LOCATE and RECTIFY the break in the circuit
between the A/C clutch and ground connection
G1D129 with the aid of the Wiring Diagrams.
CHECK the operation of the system.

E11: CHECK THE PLAUSIBILITY OF THE AMBIENT TEMPERATURE

Connect the diagnostic tool.

1

Using the Ford approved diagnostic tool, select
PCM/AAT in data logger and check the ambient air

temperature.

2

Is the indicated ambient air temperature plausible?
Yes

GO to E12

.

No

GO to E51

.

E12: CHECK THE A/C SWITCH SIGNAL

Switch on the blower.

1

Switch on the air conditioning (A/C).

2

Using the Ford approved diagnostic tool, select
BCM/AC_SW in data logger and check the A/C

switch signal.

3

Is an A/C switch signal displayed in the data logger of
the BCM?
Yes

GO to E25

.

No

- All except vehicles with electronic automatic
temperature control (EATC):

GO to E21

.

- Vehicles with electronic automatic temperature
control (EATC)

GO to E13

.

E13: CHECK THE VOLTAGE AT THE EVAPORATOR TEMPERATURE SENSOR

Ignition switch in position 0.

1

Disconnect Connector C2H406-A from the
evaporator temperature sensor.

2

Ignition switch in position II.

3

Measure the voltage between the evaporator
temperature sensor, connector C2H406-A, pin 1,

circuit VH406A (all except vehicles with electronic
automatic temperature control (EATC): circuit
VH406C) (VT/BN), wiring harness side and ground.

4

Is a voltage of approx. 5 volts measured?
Yes

GO to E18

.

No

- The voltage measured is more than 6
Volts:LOCATE and RECTIFY the short to voltage in
circuit VH406A (all except vehicles with electronic
automatic temperature control (EATC): circuit
VH406C) (VT/BN) between the EATC module or
GEM and the evaporator temperature sensor with
the aid of the Wiring Diagrams. CHECK the

operation of the system.
- No voltage measured:All except vehicles with
electronic automatic temperature control
(EATC):

GO to E14

. Vehicles with electronic

automatic temperature control (EATC)

GO to E16

.

E14: CHECK THE CIRCUIT BETWEEN THE EVAPORATOR TEMPERATURE SENSOR AND
THE GEM FOR A SHORT TO GROUND

Ignition switch in position 0.

1

Disconnect Connector C1BP02-C from the GEM.

2

Measure the resistance between the evaporator
temperature sensor, connector C2H406-A, pin 1,

circuit VH406C (VT/BN), wiring harness side and
ground.

3

Is a resistance of more than 10,000 Ohms measured?
Yes

GO to E15

.

No

LOCATE and REPAIR the short to ground in circuit
VH406C (VT/BN) between the GEM and the
evaporator temperature sensor with the aid of the
Wiring Diagrams. CHECK the operation of the
system.

E15: CHECK THE CIRCUIT BETWEEN THE EVAPORATOR TEMPERATURE SENSOR AND
THE GEM FOR OPEN CIRCUIT

Measure the resistance between the evaporator
temperature sensor, connector C2H406-A, pin 1,

circuit VH406C (VT/BN), wiring harness side and
the GEM, connector C1BP02-C, pin 2, circuit
VH406C (VT/BN), wiring harness side.

1

Is a resistance of less than 2 Ohms registered?
Yes

TEST the GEM and RENEW as necessary. CHECK the
operation of the system.

No

LOCATE and REPAIR the break in circuit VH406C
(VT/BN) between the evaporator temperature
sensor and the GEM with the aid of the Wiring
Diagrams. CHECK the operation of the system.

E16: CHECK THE CIRCUIT BETWEEN THE EVAPORATOR TEMPERATURE SENSOR AND
THE EATC MODULE FOR A SHORT TO GROUND

Ignition switch in position 0.

1

Disconnect Connector C2H101-B from the EATC
module.

2

Measure the resistance between the evaporator
temperature sensor, connector C2H406-A, pin 1,

circuit VH406A (VT/BN), wiring harness side and
ground.

3