Opel Frontera UBS. Manual - part 160

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–92

Chart 3

The shift on the fly system generates gear noises.

(The fuel economy is bad in the 2H mode.)

Function of circuit

—

Fail condition

When the vehicle is run in the 2H mode, the shift on the fly system generates gear

noises or the front wheel gears are engaged to generate a shock.

D04RW055

4B2–93

DRIVE LINE CONTROL SYSTEM (TOD)

Step

Action

Yes

No

1

Do the indicator lamps show the correct status?

Go to Step 2

Examine the

trouble based on

“Diagnosis from

Trouble Codes”.

 Go to Step 2

2

Is any of the trouble codes 28, 32 and 33 recorded?

Examine the

trouble based on

“Diagnosis from

Trouble Codes”.

 Go to Step 6

Go to Step 3

3

Turn on the starter switch.

Is the battery voltage observed between terminals 1 and 20?

Go to Step 4

Go to Step 5

4

When the 4WD SW is select to the 2WD position, are the front
axle gears correctly disengaged (and when the left front tire is
jacked up and turned, is the front propeller shaft standstill)?

The phenomenon

is not

reproduced.

Refer to

“Troubles

intermittently

observed”.

 Go to Step 6

The shift on the

fly system is

failed (refer to

Section 4C “Drive

Shaft System”.

 Go to Step 6

5

Does the battery voltage maintain the correct level?

Repair the battery

circuit.

 Go to Step 6

Repair the battery

and charging

system.

 Go to Step 6

6

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 6

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–94

Chart 4

The braking distance gets long even when the ABS is active.

Function of circuit

—

Fail condition

Enough deceleration is not obtained and the braking distance gets long even when the

ABS is active in the 2H mode.

D04RW055

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–95

Step

Action

Yes

No

1

Are the brake and ABS systems healthy?

Go to Step 2

Repair the 

brake and ABS. 

 Go to Step 4

2

Turn on the starter switch.
Is the battery voltage observed between terminals 1 and 20?

Go to Step 3

Repair the 

battery system.

 Go to Step 4

3

1. Select the 4WD SW to the 2WD position.

2. The voltage between terminals 3 and 19 range between 7.5

and 16V (0.24 seconds make a cycle)

Does the voltage within the range specified?

Examine the 

trouble based 

on “Diagnosis 

from Trouble 

Codes".

 Go to Step 4

The ECU has 

failed. Replace 

the ECU.

 Go to Step 4

4

Check that all the parts are mounted.
Is this step complete?

Repeat the 

“Diagnosis Flow".

Return to Step 4