OPEL FRONTERA 1998 Workshop Manual

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–60
StepActionYe sNo
1Turn on the starter switch.
Is the battery voltage observed between terminals 1 and 19?The ECU has
failed. Replace
the ECU.
Go to Step 2
Check the battery
circuit.
Go to Step 2
2Check that all the parts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow”.
Go to Step 2

4B2–61 DRIVE LINE CONTROL SYSTEM (TOD)
Chart B–1The 4WD switch circuit wires are broken or short-circuited to the GND
Function of circuit—
Fail conditionEven after the transfer mode is selected from TOD to 2H, the indicator lamp status is not
changed.
Indicator lamp status
—
Transfer position2H—
D04RW062

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–62
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
SW circuit.
Go to Step 4
2When the 4WD SW is selected to the 2WD position, is 12 V
observed between terminals 12 and 19?
Go to Step 3
Repair the 4WD
SW circuit.
Go to Step 4
3When the transfer lever is shifted to the 4L position, is battery
boltage observed between terminals 28 and 19?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 4
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

4B2–63 DRIVE LINE CONTROL SYSTEM (TOD)
Chart B–2The 4WD 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
D04RW062

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–64
StepActionYe sNo
1When 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
SW circuit.
Go to Step 7
2When the 4WD SW is selected to the 2WD position, is 12 V
observed between terminals 12 and 19?
Go to Step 3
Repair the 4WD
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

4B2–65 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 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
D04RW062

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–66
StepActionYe sNo
11. Turn on the starter switch.
When the transfer lever is shifted to the high position, is 5V
observed between terminals 8 and 19 (4H switch)?
Go to Step 2Go to Step 4
2When the transfer lever is shifted to the 4L position, is 5V
observed between terminals 8 and 19 (4H switch)?
Go to Step 3Go to Step 4
3When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 8 and 19 (4H switch)?Replace the
ECU.
Go to Step 4
Go to Step 4
41. Turn off the starter switch.
2. Disconnect the ECU connector.
3. Turn on the starter switch.
When the transfer lever is shifted to the high position, is 12V
observed between terminals 8 and 19 (4H switch)?
Go to Step 5Go to Step 7
5When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 8 and 19 (4H switch)?
Go to Step 6Go to Step 7
6When the transfer lever is shifted to the 4L position, is 12V
observed between terminals 8 and 19 (4H switch)?The 4H switch
circuit battery is
short-circuited
between ECU
and transfer.
Repair the circuit.
Go to Step 14
Go to Step 7
7Turn off the starter switch.
When the transfer lever is shifted to the neutral position, is the
continuity established between terminals 8 and 19 (4H switch)?
Go to Step 8Go to Step 10
8When the transfer lever is shifted to the high position, is the
continuity established between terminals 8 and 19?
Go to Step 10Go to Step 9
9When the transfer lever is shifted to the 4L position, is the
continuity established between terminals 8 and 19?
Go to Step 14
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 10
10When the transfer lever is shifted to the neutral position, is the
continuity established between terminals (A–3)4 and (A–3)7?
Go to Step 11
Repair the
transfer
assembly.
Go to Step 14
11When the transfer lever is shifted to the high position, is the
continuity established between transfer connector terminals
(A–3)4 and (A–3)7?Repair the
transfer
assembly.
Go to Step 14
Go to Step 12
12When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(B–68)3 and (A–3)4?Repair the
transfer
assembly.
Go to Step 14
Go to Step 13

4B2–67 DRIVE LINE CONTROL SYSTEM (TOD)
StepNo Ye s Action
13Is the continuity established between transfer terminals (A–3)4
and body?
The ECU has
failed. Replace
the ECU.
Go to Step 14
The harness is
broken between
terminal (A–3)4
and GND. Repair
the circuit.
Go to Step 14
14Check that all the parts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow”.
Return to Step 14

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–68
Chart C–2The 4H switch circuit is short-circuited to GND.
Function of circuit—
Fail conditionWhen the transfer lever is shifted to 4L, the indicator lamp status is not changed.
When the transfer lever is shifted to High, the indicator lamp blinks at TOD mode.
Indicator lamp status
Transfer position4LHigh (TOD)
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4B2–69 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
1When the transfer lever is shifted to the High position, is 5V
observed between terminals 8 and 19 (4H switch)?
Go to Step 2Go to Step 14
2When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 8 and 19 (4H switch)?
Go to Step 3Go to Step 14
3When the transfer lever is shifted to the 4L position, is 5V
observed between terminals 8 and 19 (4H switch)?
Go to Step 4Go to Step 14
41. Turn off the starter switch.
Is the continuity established between terminals 1 and 25?
Go to Step 5
Replace TOD
indcator lamp
bulb.
Go to Step 23
5Is the continuity established between terminals 1 and 26?
Go to Step 6
Replace TOD
indicator lamp
bulb.
Go to Step 23
6Is the continuity established between terminals 1 and 27?
Go to Step 7
Replace TOD
indicator lamp
bulb.
Go to Step 23
7Is the continuity established between terminals 1 and 28?
Go to Step 8
Replace TOD
indicator lamp
bulb.
Go to Step 23
8Is the continuity established between terminals 1 and 29?
Go to Step 9
Replace TOD
indicator lamp
bulb.
Go to Step 23
91. Turn on the starter switch.
2. Shift the transfer lever is shifted to the 4L position.
Is 0 V observed between terminals 25 and 20?
Go to Step 10
The ECU has
failed. Replace
the ECU.
Go to Step 23
10Is 0 V observed between terminals 26 and 20?
Go to Step 11
The ECU has
failed. Replace
the ECU.
Go to Step 23
11Is 0 V observed between terminals 27 and 20?
Go to Step 12
The ECU has
failed. Replace
the ECU.
Go to Step 23
12Is 12 V observed between terminals 28 and 20?
Go to Step 13
The ECU has
failed. Replace
the ECU.
Go to Step 23
13Is 0 V observed between terminals 29 and 20?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 23
The ECU has
failed. Replace
the ECU.
Go to Step 23