4WD OPEL FRONTERA 1998 Workshop Manual

4B2–79 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn on the starter switch.
When the 4WD SW is selected to the 4WD position, is 0 V
observed between terminal 12 and 19?
Go to Step 2
Repair the 4WD
AUTO SW circuit.
Go to Step 4
2When the 4WD AUTO SW is selected to the 2WD position, is 12 V
observed between terminals 12 and 19?
Go to Step 3
Repair the 4WD
AUTO SW circuit.
Go to Step 4
3When the transfer lever is shifted to the 4L position, is battery
voltage observed between terminals 28 and 19?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Replace the
ECU.
Go to Step 4
4Check that all the parts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow”.
Return to Step 4

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–80
Chart B–2The 4WD AUTO switch circuit is short to battery.
Function of circuit—
Fail conditionEven after the transfer mode is selected from 2H to TOD, the indicator lamp status dose
not change.
Indicator lamp status
Transfer positionTOD
D04RY00114

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–82
StepActionYe sNo
1When the 4WD AUTO SW is selected to the 4WD position, is 0 V
observed between terminal 12 and 19?
Go to Step 2
Repair the 4WD
AUTO SW circuit.
Go to Step 7
2When the 4WD AUTO SW is selected to the 2WD position, is 12 V
observed between terminals 12 and 19?
Go to Step 3
Repair the 4WD
AUTO SW circuit.
Go to Step 7
31. Disconnect the ECU connector.
Is the continuity established between terminals (B–67)1 and
(B–68)13?
Go to Step 4
Replace TOD
indicator lamp
bulb.
Go to Step 7
4Is the continuity established between terminals (B–67)1 and
(B–68)14?
Go to Step 5
Replace TOD
indicator lamp
bulb.
Go to Step 7
5Is the continuity established between terminals (B–67)1 and
(B–68)15?
Go to Step 6
Replace TOD
indicator lamp
bulb.
Go to Step 7
6Is the continuity established between terminals (B–67)1 and
(B–68)16?
Replace ECU.
Go to Step 7
Replace TOD
indicator lamp
bulb.
Go to Step 7
7Check that all the parts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow”.
Return to Step 7

4B2–83 DRIVE LINE CONTROL SYSTEM (TOD)
Chart C–14H switch circuit wires are broken or the battery is short-circuited.
Function of circuit—
Fail conditionWhen the 4WD AUTO SW is 4WD mode.
When the lever is shifted from 4L to HIGH, the 4L mode remains on the indicator and the
TOD mode is displayed without turning off the previous mode.
Indicator lamp status
Transfer position4L <——> Neutral <——> TOD
D04RY00114

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–96
StepActionYe sNo
1When the transfer lever is shifted to the high position, is 5V
observed between terminals 9 and 19 (4L switch)?
Go to Step 2Go to Step 7
2When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 9 and 19 (4L switch)?
Go to Step 3Go to Step 7
3When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 9 and 19 (4L switch)?
Go to Step 4Go to Step 7
41. Shift the 4WD AUTO SW to the 2H position.
Is 12V observed between terminals 25 and 19?
Go to Step 5
The ECU has
failed. Replace
the ECU.
Go to Step 16
5Is 12V observed between terminals 26 and 19?
Go to Step 6
The ECU has
failed. Replace
the ECU.
Go to Step 16
6Is 12V observed between terminals 27 and 19?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
The ECU has
failed. Replace
the ECU.
Go to Step 16
71. Turn off the starter switch.
2. Disconnect the ECU connector.
When the transfer lever is shifted to the neutral position between
High and 4L, is the continuity established between terminals
(B–68)4 and (B–67)11?
Go to Step 8Go to Step 10
8When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–68)4 and (B–67)11?
Go to Step 9Go to Step 10
9When the transfer lever is shifted to the high position, is the
continuity established between terminals (B–68)4 and (B–67)11?
Go to Step 10
The ECU has
failed. Replace
the ECU.
Go to Step 16
101. Disconnect the H-49 connector.
When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(H-49)5 and (B-67)11?
Go to Step 11Go to Step 13
11When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(H-49)5 and (B-67)11?
Go to Step 12Go to Step 13
12When the transfer lever is shifted to the high position, is the
continuity established between terminals (H-49)5 and (B-67)11?
Go to Step 13
GND is
short-circuited
between
terminals (B–68)4
and (H-49)5.
Repair the circuit.
Go to Step 16
131. Disconnect the A-3 connector.
When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(A-3)12 and GND?
Go to Step 14
Repair the
transfer
assembly.
Go to Step 16
14When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (A-3)12 and GND?
Go to Step 15
Repair the
transfer
assembly.
Go to Step 16

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–102
StepActionYe sNo
1Start the engine.
When the transfer lever is shifted to the neutral position between
high and 4L, is 5V observed between terminals 10 and 19?
Go to Step 2Go to Step 7
2When the transfer lever is shifted to the high position and 4WD
AUTO SW is selected to the 4WD position, is 0V observed
between terminals 10 and 19?
Go to Step 3Go to Step 7
3When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 10 and 19?The ECU has
failed. Replace
the ECU.
Go to Step 4
Go to Step 7
4Shift the transfer lever to the 4L position.
Is 0V observed between terminals 25 and 19?
Go to Step 5
The ECU has
failed. Replace
the ECU.
Go to Step 19
5Is 0V observed between terminals 26 and 19?
Go to Step 6
The ECU has
failed. Replace
the ECU.
Go to Step 19
6Is 0V observed between terminals 27 and 19?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
The ECU has
failed. Replace
the ECU.
Go to Step 19
7When the transfer lever is shifted to the high position and 4WD
AUTO SW is selected to the 2H position, is the battery voltage
observed between terminals 5 and 19?
Go to Step 8Go to Step 11
8When the transfer lever is shifted to the neutral position between
high and 4L, is the battery voltage observed between terminals 5
and 19?
Go to Step 9Go to Step 11
9When the transfer lever is shifted to the high position and 4WD
AUTO SW is selected to the 4WD position (TOD mode), is 0V
observed between terminals 5 and 19?
Go to Step 10Go to Step 11
10When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 5 and 19?
Go to Step 12Go to Step 11
11Is any of the trouble codes 28, 32 and 33 recorded?Examine the
trouble based on
“Diagnosis from
Trouble Codes”.
The ECU has
failed. Replace
the ECU.
121. Turn off the starter switch.
2. Disconnect the ECU connector.
Does the resistance between terminals (B–67)5 and (B–67)11
meet the standard, 17< R < 25 ohm?
Go to Step 13
Repair the circuit
or replace the
VSV.
Go to Step 19
131. Turn on the starter switch.
When the 4WD AUTO SW is selected to the 2WD position, is the
battery voltage supplied to each VSV?
Go to Step 14
Repair the circuit
or replace the
VSV.
Go to Step 19
14When the transfer lever is shifted to the neutral position between
high and 4L, is the battery voltage supplied to each VSV?
Go to Step 15
Repair the circuit
or replace the
VSV.
Go to Step 19

4B2–103 DRIVE LINE CONTROL SYSTEM (TOD)
StepNo Ye s Action
15When the transfer lever is shifted to the high position and 4WD
AUTO SW is selected to the 4WD position, is 0V observed on
each VSV?
Go to Step 16
Repair the circuit
or replace the
VSV.
Go to Step 19
16When the transfer lever is shifted to the 4L position, is 0V
observed on each VSV?
Go to Step 17
Repair the circuit
or replace the
VSV.
Go to Step 19
17Is the vacuum pressure supplied to the VSV?
Go to Step 18
Repair the
vacuum system.
Go to Step 19
18Can the single AXLE switch enable and disable the continuity?
Repair the shift
on the fly system
(refer to Section
4B1 and 4C.)
Replace the
AXLE switch
(refer to Section
4B1 and 4C of
Chassis Repair
Manual).
19Check that all the parts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow”.
Return to Step 19

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–104
Chart E–2The AXLE switch circuit is short-circuited to GND.
Function of circuit—
Fail conditionEven after the 4WD AUTO SW is select to the 2WD position, the 2WD mode is not
enabled. (The transition status is not removed.)
Indicator lamp status
Transfer position2H
D04RY00068

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–108
StepActionYe sNo
1Start the engine.
When the transfer lever is shifted to the neutral position between
high and 4L, is 5V observed between terminals 10 and 19?
Go to Step 2Go to Step 7
2When the transfer lever is shifted to the high position and 4WD
AUTO SW is selected to the 4WD position, is 0V observed
between terminals 10 and 19?
Go to Step 3Go to Step 7
3When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 10 and 19?
Go to Step 4Go to Step 7
4Select the 4WD AUTO SW to the 2WD position.
Is 12V observed between terminals 25 and 19?
Go to Step 5
Replace the
ECU.
Go to Step 19
5Is 12V observed between terminals 26 and 19?
Go to Step 6
Replace the
ECU.
Go to Step 19
6Is 12V observed between terminals 27 and 19?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
The ECU has
failed. Replace
the ECU.
Go to Step 19
7When the 4WD AUTO SW is selected to the 2WD position, is the
battery voltage observed between terminals 5 and 19?
Go to Step 8Go to Step 11
8When the transfer lever is shifted to the neutral position between
high and 4L, is the battery voltage observed between terminals 5
and 19?
Go to Step 9Go to Step 11
9When the transfer lever is shifted to the high position and 4WD
AUTO SW is selected to the 4WD position, is 0V observed
between terminals (B–67)5 and (B–67)11?
Go to Step 10Go to Step 11
10When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 5 and 19?
Go to Step 12Go to Step 11
11Is any of the trouble codes 28, 32 and 33 recorded?Examine the
trouble based on
“Diagnosis from
Trouble Codes”.
The ECU has
failed. Replace
the ECU.
121. Turn off the starter switch.
2. Disconnect the ECU connector.
Does the resistance between terminals 5 and 19 meet the
standard, 17< R < 25 ohm?
Go to Step 13
Repair the circuit
or replace the
VSV.
Go to Step 19
131. Connect the ECU connector.
2. Turn on the starter switch.
When the 4WD AUTO SW is selected to the 2WD position, is the
battery voltage supplied to each VSV?
Go to Step 14
Repair the circuit
or replace the
VSV.
Go to Step 19
14When the transfer lever is shifted to the neutral position between
high and 4L, is the battery voltage supplied to each VSV?
Go to Step 15
Repair the circuit
or replace the
VSV.
Go to Step 19
15When the transfer lever is shifted to the high position and 4WD
AUTO SW is selected to the 4WD position, is 0V observed on
each VSV?
Go to Step 16
Repair the circuit
or replace the
VSV.
Go to Step 19

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–114
Diagnosis from Symptom
Troubles that are not indicated by the warning lamp are
listed in the table below. These troubles are caused by
the faults that cannot be detected by the self-diagnostic
function of the control unit.
If this type of trouble is observed, interview the customer
and conduct test runs to reproduce the trouble,
cross-check the reported trouble with the listed
phenomena, and diagnose and analyze the trouble on the
item by item basis.
PhenomenaMajor causeCorrective action
1The tight corner braking is
observed when the vehicle is
subject to full steering.The standard tires are not used.
The tire pressure is incorrect.
The tires are worn inuniformity.
The transfer or wiring is
imperfect.
The limited slip differential is
failed.
Check and recondition the
vehicle according to Chart 1.
2Even if the 4WD AUTO SW is
select to the 4WD position, the
4WD mode is not active, resulting
in remarkable rear wheel spin.The transfer or wiring is
imperfect.
The shift on the fly system is
failed.
Check and recondition the
vehicle according to Chart 2.
3When the 4WD AUTO SW is
selected to the 4WD position,
the drive resistance of the 4WD
system is too large to get
sufficient running speed.
Noised drive line.
The standard tires are not used.
The tire pressure is incorrect.
The tires are worn inuniformity.
The transfer or wiring is
imperfect.
The limited slip differential is
failed.
Check and recondition the
vehicle according to Chart 1.
4The shift on the fly system (front
axle) generates gear noises.The wiring is imperfect.
The shift on the fly system is
failed.
Check and recondition the
vehicle according to Chart 3.
5The braking distance gets long
even when the ABS is active.The wiring is imperfect.
The ABS is failed.
Check and recondition the
vehicle according to Chart 4.