Ford Galaxy / Ford S-MAX. Manual — part 637

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

GO to E17

.

No

LOCATE and REPAIR the short to ground in circuit
VH406A (VT/BN) between the EATC module and the
evaporator temperature sensor with the aid of the
Wiring Diagrams. CHECK the operation of the
system.

E17: CHECK FOR OPEN CIRCUIT BETWEEN THE EVAPORATOR TEMPERATURE SENSOR
AND THE EATC MODULE

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

circuit VH406A (VT/BN), wiring harness side and
the EATC module, connector C2H101-B, pin 4,
circuit VH406A (VT/BN), wiring harness side.

1

Is a resistance of less than 2 Ohms registered?
Yes

CHECK the EATC module, if necessary INSTALL a
new one. CHECK the operation of the system.

No

LOCATE and REPAIR the break in circuit VH406A
(VT/BN) between the evaporator temperature
sensor and the EATC module with the aid of the
Wiring Diagrams. CHECK the operation of the
system.

E18: CHECK THE GROUND CONNECTION OF THE EVAPORATOR TEMPERATURE
SENSOR

Ignition switch in position 0.

1

Measure the resistance between the evaporator
temperature sensor, connector C2H406-A, pin 3,

circuit RH105P (all except vehicles with electronic
automatic temperature control (EATC): circuit
RH105U) (GN), wiring harness side and ground.

2

Is a resistance of less than 2 Ohms registered?
Yes

RENEW the evaporator temperature sensor. CHECK
the operation of the system.

No

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

GO to E19

.

- Vehicles with electronic automatic temperature
control (EATC)

GO to E20

.

E19: CHECK THE CIRCUIT BETWEEN THE EVAPORATOR TEMPERATURE SENSOR AND
THE GEM FOR OPEN CIRCUIT

Disconnect Connector C1BP02-C from the GEM.

1

Measure the resistance between the evaporator
temperature sensor, connector C2H406-A, pin 3,

circuit RH105U (GN), wiring harness side and the
GEM, connector C1BP02-C, pin 1, circuit RH105U
(GN),wiring harness side.

2

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 RH105U
(GN) between the evaporator temperature sensor
and the GEM with the aid of the Wiring Diagrams.
CHECK the operation of the system.

E20: CHECK FOR OPEN CIRCUIT BETWEEN THE EVAPORATOR TEMPERATURE SENSOR
AND THE EATC MODULE

Disconnect Connector C2H101-B from the GEM.

1

Measure the resistance between the evaporator
temperature sensor, connector C2H406-A, pin 3,

circuit RH105P (GN), wiring harness side and the
EATC module, connector C2H101-B, pin 17, circuit
RH105T (GN), wiring harness side.

2

Is a resistance of less than 2 Ohms registered?
Yes

CHECK the EATC module, if necessary INSTALL a
new one. CHECK the operation of the system.

No

LOCATE and REPAIR the break in circuit RH105U
(GN) between the evaporator temperature sensor
and the GEM with the aid of the Wiring Diagrams.
CHECK the operation of the system.

E21: CHECK THE A/C REQUEST SIGNAL IN THE GENERIC ELECTRONIC MODULE (GEM)

Set the blower switch to position 1.

1

Switch on the air conditioning (A/C).

2

Using the diagnostic tester, select the GEM and
check in the data logger whether an A/C request

signal is displayed.

3

Is an A/C request signal displayed in the data logger of
the GEM?
Yes

GO to E13

.

No

GO to E22

.

E22: CHECK THE SIGNAL FROM THE A/C ON/OFF SWITCH AT THE CJB

Ignition switch in position 0.

1

Disconnect Connector C1BP02-C from the CJB.

2

Ignition switch in position II.

3

Set the blower switch to position 1.

4

Switch on the air conditioning (A/C).

5

Measure the voltage between the CJB, connector
C1BP02-C, pin 26, circuit CH434A (GY/YE), wiring

harness side and ground.

6

Does the meter display battery voltage?
Yes

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

No

GO to E23

.

E23: CHECK THE CIRCUIT BETWEEN THE A/C CONTROL ASSEMBLY AND THE CJB FOR
OPEN CIRCUIT

Ignition switch in position 0.

1

Disconnect connector C2H101-C from the A/C
control assembly

2

Measure the resistance between the air
conditioning control assembly, connector C2H101-

C, pin 2, circuit CH434A (GY/YE), wiring harness
side and the CJB, connector C1BP02-C, pin 26,
circuit CH434A (GY/YE), wiring harness side.

3

Is a resistance of less than 2 Ohms registered?
Yes

GO to E24

.

No

LOCATE and RECTIFY the break in circuit CH434A
(GY/YE) between the air conditioning control
assembly and the CJB with the aid of the Wiring
Diagrams. CHECK the operation of the system.

E24: CHECK THE CIRCUIT BETWEEN THE A/C CONTROL ASSEMBLY AND THE CJB FOR
SHORT TO GROUND

Measure the resistance between the air
conditioning control assembly, connector C2H101-

C, pin 2, circuit CH434A (GY/YE), wiring harness
side and ground.

1

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

CHECK and if necessary RENEW the air conditioning
control panel. CHECK the operation of the system.

No

LOCATE and RECTIFY the short to ground in circuit
CH434A (GY/YE) between the air conditioning
control assembly and the CJB with the aid of the
Wiring Diagrams. CHECK the operation of the
system.

E25: CHECK THE REFRIGERANT QUANTITY

CHECK the quantity of refrigerant.
REFER to:

Air Conditioning (A/C) System Recovery,

Evacuation and Charging

(412-00 Climate Control

System - General Information, General
Procedures).

1

Is the quantity of refrigerant in the system in
accordance with the manufacturer's specifications?
Yes

GO to E26

.

No

Fill up the required quantity of refrigerant in
accordance with the manufacturer's specifications.
REFER to:

Air Conditioning (A/C) System Recovery,

Evacuation and Charging

(412-00 Climate Control

System - General Information, General
Procedures).
TEST the system for normal operation.

E26: CHECK THE CONTROL VOLTAGE AT A/C CLUTCH RELAY H401

Measure the voltage between A/C clutch relay
H401, socket C1BB03-A, pin 31, circuit SBB07C

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

1

Does the meter display battery voltage?
Yes

GO to E27

.

No

LOCATE and RECTIFY the break in the circuit
between fuse F7 and the A/C clutch relay H401 with
the aid of the Wiring Diagrams. CHECK the
operation of the system.

E27: CHECK AIR CONDITIONING CLUTCH RELAY H401

Check A/C clutch relay H401 according to the

1