Opel Frontera UBS. Manual - part 1967

 

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Opel Frontera UBS. Manual - part 1967

 

 

4B2–15

DRIVE LINE CONTROL SYSTEM (TOD)

How to Clear The Trouble Code
The trouble codes saved to the control unit can be deleted
by the following procedure if the starter switch is being in
the OFF position.

1. Shift the transfer lever to the neutral position between

HIGH and 4L, and short-circuit the self-diagnostic
connector.

NOTE: The neutral position between HIGH and 4L refers
to the point that turns off the TOD indicator lamps.
(However, be sure to check the position before
short-circuiting the self-diagnostic connector.)

C07RW011

2. Turn on the starter switch while maintaining the state

of step 1, and step on the brake pedal five times within
five seconds from the first step on.  (Note that “five
times” includes the first step on).  (The TOD indicator
lamps display the 4L mode whenever the brake pedal
is stepped on.)

3. If the conditions shown in steps 1 and 2 are met, the

trouble codes saved to the control unit are cleared.
(After the codes are completely deleted, the code 12
that indicates the normal condition is continuously
displayed.)

Precautions on Diagnosis

Replacement of Control Unit
The control unit itself rarely fails.  In most cases, the
harnesses have failed (i.e. short-circuit) to cause
secondary troubles.  Other cases include that the cause
has been unknown due to intermittent occurrence of
troubles and the troubles are removed accidentally along
with replacement of control unit, resulting in misjudgment
of cause.  Therefore, before replacing the control unit,
check the connector joints and whether the unspecified
current flows in the control unit due to short-circuit
between harnesses.

Trouble Intermittently Observed
Troubles intermittently observed are mostly attributable
to temporary imperfect connection of harnesses and
connectors.
When such troubles are found, check the associated
circuit according to the following procedure.

1. Check whether improper connectors are plugged in

or connector terminals are completely engaged.

2. Check whether the terminals are deformed or

damaged.  If yes, remove the deformation or damage
and connect the terminals securely.

3. It is likely that wires in the harness are falsely broken.

Therefore, in examination of failed harness circuit,
shake the harness for check to such extent that the
harness will not be damaged.

Test Run of Failed TOD Vehicle
If the TOD indicator lamps experienced faulty operation
even once in the past, the failed portion can be identified
by use of the procedure “Diagnosis from Trouble Codes”
or “Trouble Diagnosis  Depending on The Status of TOD
Indicator”.  If the troubles that are only recognized as
abnormal phenomena of the vehicle by the driver are
observed, conduct the test run in the following procedure
to reproduce the faulty phenomena and diagnose the fault
for each phenomenon.

1. Start the engine, and check that the TOD indicator

lamps are turned on for about two seconds for initial
check; the CHECK lamp goes off; and the TOD
indicator lamps display the specified drive mode.  (If
the CHECK lamp starts blinking, read the trouble
codes and identify the failed portion.)

2. While keeping the vehicle standstill, operate the 4WD

switch and shift the transfer lever to change the
modes: 2H mode

TOD mode

4L mode

TOD

mode

2H mode.  Check that the TOD indicator

lamps correctly display the status whenever the
mode is changed.  If the transition status is displayed
during the shift operation, run the vehicle a little to
complete shifting.

3. Slowly start the vehicle in the TOD mode, and add the

power to accelerate to at least 40 km/h and maintain
the speed for about two minutes.  Apply the brake to
completely stop the vehicle.  Repeat this test pattern
at least three times.

4. Turn the steering to the right end (or left end) in the

TOD mode, and slowly start the vehicle and make a
circle five times. Next, conduct the same test in the 2H
mode.

5. Slowly start the vehicle in the TOD mode, and

accelerate to at least 40 km/h. Keep the established
speed, carefully change the mode in the sequence
“TOD mode

2H mode 

TOD mode” while checking

that the shift is complete in each mode change.  After
the test, apply the brake to completely stop the
vehicle.

6. Slowly start the vehicle in the TOD mode, and

accelerate to at least 40 km/h.  Apply the brake
strongly so that the ABS works, and completely stop
the vehicle.

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–16

7. Slowly start the vehicle in the 4L mode, and

accelerate to at least 20 km/h.  Apply the brake to
completely stop the vehicle.

If the CHECK lamp starts blinking during the test run, read
the trouble codes and give appropriate maintenance
according to the  diagnostic procedure.  If the TOD
indicator lamps are lit abnormally during the run, check
the lighting condition and give appropriate maintenance
according to the diagnostic procedure.  Even if the
phenomena are not observed, try to reproduce the
abnormal state reported by the customer to the possible
extent.

Post-Repair Check
As long as the starter is not turned off, the TOD indicator
lamps continue blinking even after the failed portion
repaired.  Therefore, upon completion of repair, be sure to
turn off the starter switch once and then turn on it to
conduct the test run sequence specified in steps 1
through 7 above and check that the TOD indicator lamps
no longer show any faulty status.

4B2–17

DRIVE LINE CONTROL SYSTEM (TOD)

Basic Diagnostic Flow Chart

C04RY00015

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–18

Parts Location (RHD 6VE1)

D08RW621

Legend

(1) I–9
(2) B–13 or B–14
(3) H–12
(4) I–12
(5) A–3
(6) H–7, H–8
(7) H–32
(8) C–16
(9) H–5, H–6

(10) C–63

(11) H–49

(12) M–22
(13) M–23
(14) M–24
(15) H–10
(16) E–5
(17) E–29
(18) H–42
(19) E–30
(20) Battery
(21) H–13, H–15, H–25, H–26, H–27
(22) Fuse Box
(23) B–67, B–68

 

 

 

 

 

 

 

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