Opel Frontera UBS. Manual - part 1978

4B2–59

DRIVE LINE CONTROL SYSTEM (TOD)

Check flow

Trouble code

Phenomenon

Standard

9

31

(P1721)

The electromagnetic coil is broken

or shorted to the battery or GND.

—

D04RY00060

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–60

Step

Action

Yes

No

1

1. Clear the trouble code.
2. Start the engine
3. Set the TOD mode.

Is there DTC31 (P1721)?

Go to 

Step 2

Refer to 

“Trouble

intermittently

observed”.

2

1. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.

Is the continuity established between terminals (B–67)4 and
(B–67)12?

Go to 

Step 3

Go to 

Step 5

3

1. Connect the ECU connector.
2. Start the engine.
3. Set the TOD mode.

Does the voltage between terminals 4 and 20 indicate at least
0.4V?

Go to 

Step 4

Go to 

Step 6

4

Is the battery voltage always observed between terminals 4 and
20?

The harness is

short–circuited on

the battery.

Repair the circuit.

Go to 

Step 8

Go to 

Step 6

5

1. Disconnect the A–3 connector.

Is the continuity established between transfer connector
terminals (A–3)8 and (A–3)7?

The harness is
broken. Repair

the circuit.

Go to 

Step 8

Replace the

transfer

electromagnetic

coil (solenoid

clutch).

Go to 

Step 8

6

1. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.

Is the resistance between the connector (B–67) terminal 4 and 12
1.0 

∼

 5.0

W

?

The ECU has

failed. Replace

the ECU 

Go to 

Step 8

Go to 

Step 7

7

Is the resistance between the transfer connector (A–3) terminal 8
and 7   1.0 

∼

 5.0

W

?

The harness is

disconnection or

short to GND.

Repair the circuit.

Go to 

Step 8

Replace the

transfer

electromagnetic

coil (solenoid

clutch).

Go to 

Step 8

8

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

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 8

4B2–61

DRIVE LINE CONTROL SYSTEM (TOD)

Check flow

Trouble code

Phenomenon

Standard

10

26

The electromagnetic coil is short-

circuited to GND.

Resistance: 1.0 to 5.0 ohm (at

ordinary temperature)

D04RY00060

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–62

Step

Action

Yes

No

1

1. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.

Does the resistance between terminals (B–67)4 and (B–67)12?
indicate 1.0 to 5.0 ohm?

Go to Step 2

Go to Step 3

2

1. Connect the ECU connector.
2. Start the engine.
3. Set the TOD mode.

When the throttle is operated between full close and full open
positions, does the voltage between terminals 4 and 20 indicate
0.1 to 1.0 V?

The phenomenon

is not

reproduced.

Refer to

“Troubles

intermittently

observed”.

The ECU has

failed. Replace

the ECU.

Go to Step 4

3

Does the resistance between transfer connector terminals (A–3)8
and (A–3)7 indicate 1.0 to 5.0ohm?

The harness is
broken. Repair

the circuit.

Go to Step 4

Replace the

transfer

electromagnetic

coil.

Go to Step 4

4

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

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 4