Ford Galaxy / Ford S-MAX. Manual — part 841

Is a resistance of less than 2 Ohms registered?
Yes

CHECK the PCM and RENEW if necessary. CHECK
the operation of the system.

No

LOCATE and REPAIR the open in the respective
circuit between the PCM and DLC by using the
wiring diagrams. CHECK the operation of the
system.

AK30: PERFORM NETWORK TEST

NOTE: The number of modules connected to the CAN bus depends on the equipment
levels of the vehicle. Therefore, not every vehicle will have all the modules mentioned
below.

Connect the ground cable to the battery.

1

Connect the diagnostic tool.

2

Disconnect a listed component, then proceed
with the following test step:

ESP module: C1CA01

Power steering pump module: C1CS04

Parking brake module: C4CB01

Lights control module (LCM): C2LF23-A

Collision warning module: C2FM01

Steering wheel module: C2LS41

Shock absorber control module: C4CD01-B

Yaw rate / lateral acceleration sensor: C3CA09

Transmission control unit (TCM) - vehicles with
automatic transmission: C1ET34

Generic Electronic Module (GEM): C1BP02-C

3

Select the vehicle with the Ford approved
diagnostic tool.

4

Is it possible to establish communications with the
PCM?
Yes

The component last disconnected is the cause of
the concern; CHECK and if necessary RENEW the
component. CHECK the operation of the system.

No

- If not all the listed components are
disconnected:Key in OFF position. DISCONNECT
the next component (go to test step 3).
- If all the listed components are
disconnected:

GO to AK31

.

AK31: CHECK THE HS CAN BUS FOR A SHORT TO VOLTAGE SUPPLY

Ignition switch in position 0.

1

Disconnect - Vehicles with a 2.0L diesel engine:
Connector C1E108-D from the PCM.

2

Disconnect - Vehicles with a 2.0L engine:
Connector C1E104-E from the PCM.

3

Disconnect - Vehicles with a 2.5L engine:
Connector C1E108-B from the PCM.

4

Disconnect - Vehicles with a 1.8L diesel engine:
Connector C1E108-K from the PCM.

5

Disconnect - Vehicles with a 1.6L Duratec-16V
(Sigma) engine: Connector C1E104-J from the

PCM.

6

Disconnect - Vehicles with a 3.0L Duratec-VE
(VE6) engine: Connector C1E109-B from the

PCM.

7

Disconnect - Vehicles with a 2.2L diesel engine:
Connector C1E108-H from the PCM.

8

Ignition switch in position II.

9

Measure the voltage between the DLC, connector
C3DB04, pin 6, circuit VDB04L (WH/BU), wiring

harness side and ground.

10

Is a voltage measured?
Yes

LOCATE and REPAIR the short to voltage supply
in the relevant circuit with the aid of the Wiring
Diagrams. CHECK the operation of the system.

No

GO to AK32

.

AK32: CHECK THE HS CAN BUS FOR A SHORT TO VOLTAGE SUPPLY

Measure the voltage between the DLC, connector

1

C3DB04, pin 14, circuit VDB05Z (WH), wiring
harness side and ground.

Is a voltage measured?
Yes

LOCATE and REPAIR the short to voltage supply
in the relevant circuit with the aid of the Wiring
Diagrams. CHECK the operation of the system.

No

GO to AK33

.

AK33: CHECK THE HS CAN BUS FOR A SHORT TO GROUND

Ignition switch in position 0.

1

Measure the resistance between the DLC,
connector C3DB04, pin 14, circuit VDB05Z (WH),

wiring harness side and ground.

2

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

GO to AK34

.

No

LOCATE and REPAIR the short to ground in the
relevant circuit with the aid of the Wiring
Diagrams. CHECK the operation of the system.

AK34: CHECK THE HS CAN BUS FOR A SHORT TO GROUND

Measure the resistance between the DLC,
connector C3DB04, pin 6, circuit VDB04L

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

1

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

GO to AK35

.

No

LOCATE and REPAIR the short to ground in the
relevant circuit with the aid of the Wiring
Diagrams. CHECK the operation of the system.

AK35: CHECK THE HS CAN BUS FOR SHORT CIRCUIT

Measure the resistance between the DLC,
connector C3DB04, pin 6, circuit VDB04L

(WH/BU), wiring harness side and pin 14, circuit
VDB05Z (WH), wiring harness side.

1

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

CHECK the PCM and RENEW if necessary. CHECK
the operation of the system.

No

LOCATE and REPAIR the short circuit in the HS
CAN Bus using the Wiring Diagrams. CHECK the
operation of the system.

PINPOINT TEST AL : FAULTY COMMUNICATIONS BETWEEN THE MODULES
- MM CAN BUS

CAUTION: The measurements below may only be performed using the Ford

approved diagnostic tool digital multimeter. Failure to observe this instruction can lead to
damage.

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

AL1: CHECK FUSE F26

Ignition switch in position 0.

1

CHECK Fuse F26 (CJB).

2

Is the fuse OK?
Yes

GO to AL2

.

No

RENEW fuse F26 (5 A). CHECK the operation of the
system. If the fuse blows again, LOCATE and
REPAIR the short using the Wiring Diagrams.

AL2: CHECK THE VOLTAGE AT FUSE F26

Connect Fuse F26 (CJB).

1

Measure the voltage between fuse F26 (5 A) and
ground.

2

Does the meter display battery voltage?
Yes

GO to AL3

.

No

REPAIR the voltage supply to fuse F26 with the aid
of the Wiring Diagrams. CHECK the operation of the
system.

AL3: CHECK THE VOLTAGE AT THE DATA LINK CONNECTOR (DLC)

Measure the voltage between the DLC, connector
C3DB04, pin 16, circuit SBP26A (YE/RD), wiring

harness side and ground.

1

Does the meter display battery voltage?