Opel Frontera UE. Manual - part 1324

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–36

Diagnosis from Trouble Codes

D

Diagnose the fault that have been saved to the control
unit according to the system self-diagnostic function.

Check flow

Trouble code

Phenomenon

Standard

1

 23, 36, 37, 38

The ECU has failed.

—

P1712, P1714

Step

Action

Yes

No

1

Turn on the starter switch.

Is the trouble reproduced?

Replace the ECU

and conduct the

test run.

Go to 

Step 3

Go to 

Step 2

2

1. Clear the trouble codes.
2. Conduct the test run.

Is the trouble reproduced during the test run?

Replace the ECU

and conduct the

test run.

Go to 

Step 3

The trouble is not

reproduced.

Refer to 

“Trouble

intermittently

observed”.

Go to 

Step 3

3

1. Check that all the parts are mounted.
2. Clear the trouble codes.

Is this step complete?

Verify the repair.

Return to 

Step 3

SECTION

4B2–37

DRIVE LINE CONTROL SYSTEM (TOD)

Check flow

Trouble code

Phenomenon

Standard

2

14

Front speed sensor signal open or

GND short speed sensor com

0.2V > sensor voltage

P1731

GND short, s eed sensor com

open.

NOTE: The following procedure shows the case that the
front or rear sensor common grounding line is broken.

D04R100007

SECTION

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–38

Step

Action

Yes

No

1

1. Start the engine.
2. Select TOD mode.

Is there the memory except DTC 14(P1731)?

Go to 

Step 4

Go to 

Step 2

2

1. Turn off the starter switch.
2. Disconnect the ECU connector (C–59) and (C–60).

Is there the continuity between the connector (C–60) terminal 10
and 25?

Repair the circuit.

Go to 

Step 7

Go to 

Step 3

3

1. Disconnect the transfer connector (A–1).

Is there the continuity between the connector (C–60) terminal 10
and the connector (A–1) terminal 6, the connector (C–59) terminal
12 and connector (A–1) terminal 2, and the connector (C–59)
terminal 13 and connector (A–1) terminal 10?

Replace the front

speed sensor.

Go to 

Step 7

Repair the circuit.

Go to 

Step 7

4

Is the memory DTC 24(P1733)?

Go to 

Step 5

Refer to 

other

trouble check

flow.

5

Is there the continuity between harnesses of terminal 32 and 45
(vehicle side terminal of the front and rear speed sensor)?

Go to 

Step 6

Repair the circuit.

Go to 

Step 7

6

Is there the continuity between harnesses of terminal 12 and 13
(vehicle side terminal of the speed sensor COM(–) and ref)?

Replace front and

rear speed

sensor.

Go to 

Step 7

Repair the circuit.

Go to 

Step 7

7

1. Check that all the parts are mounted.
2. Clear the trouble code.

Is the step complete?

Verify the repair.

Return to 

Step 7

SECTION

4B2–39

DRIVE LINE CONTROL SYSTEM (TOD)

Check flow

Trouble code

Phenomenon

Standard

3

24

Rear speed sensor signal open or

GND short speed sensor COM

0.2 V > sensor voltage

P1733

GND short, s eed sensor COM

open.

NOTE: The following procedure shows the case that the
front or rear sensor common grounding line is broken.

D04R100007

SECTION