ECU OPEL FRONTERA 1998 Owner's Manual

4B2–51 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn on the starter switch.
2. Set the transfer to the 2H mode.
Is the battery voltage observed between terminals 5 and 19?
Go to Step 2Go to Step 5
2Is the battery voltage observed between terminals 10 and 19?Go to Step 3Go to Step 6
31. Set the transfer to the high (TOD) mode.
Does the voltage between terminals 5 and 19 indicate 0V?
Go to Step 4
The ECU has
failed. Replace
the ECU.
Go to Step 7
4Does the voltage between terminals 10 and 19 indicate 0V?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 7
The shift on the
fly system is
failed (refer to
Section 4C “Front
Axle” of Chassis
Repair Manual).
Go to Step 7
5Does the TOD indicator show the 2H mode?
The ECU has
failed. Replace
the ECU.
Go to Step 7
See “Trouble
Diagnosis
Depending on
The Status of
TOD Indicator”.
Go to Step 7
6Set the transfer to the high (TOD) mode.
Does the voltage between terminals 5 and 19 indicate 0V?The shift on the
fly system has
failed (refer to
Section 4C “Front
Axle” of Chassis
Repair Manual).
Go to Step 7
The ECU has
failed. Replace
the ECU.
Go to Step 7
71. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 7

4B2–53 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.
Is the continuity established between terminals (B–67)5 and
(B–67)11?
Go to Step 2
The harness is
broken. Repair
the circuit.
Go to Step 3
2Does the voltage between terminals 5 and 19 indicate 0V?
Go to Step 3
The battery is
short-circuited.
Repair the circuit.
Go to Step 4
31. Turn off the starter switch.
2. Connect ECU connector.
3. Turn on the starter switch.
4. Set the transfer to the 2H mode.
Is the battery voltage observed between terminals 5 and 19?The phenomenon
is not reproduced
Refer to
“Troubles
intermittently
observed”.
Go to Step 4
The ECU has
failed. Replace
the ECU.
Go to Step 4
41. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 4

4B2–55 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.
Does the resistance between terminals 5 and 19 meet the
standard, R = 21
4 ohms?
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 4
Go to Step 2
2Is the resistance between terminals 5 and 19 R<2 ohms?The signal line
circuit of the shift
on the fly system
is short-circuited
to GND. Repair
the circuit.
Go to Step 3
Go to Step 3
3Is the resistance between terminals 5 and 19 R= 97ohms?The signal line
circuit of the shift
on the fly system
is layer
short-circuited*.
Replace the valve
(VSV).
Go to Step 3
Go to Step 4
41. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 4
*Layer short-circuit : The coil is damaged by overcurrent.

4B2–57 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn on the starter switch.
Is the CHECK lamp always turned on?
Go to Step 2Go to Step 3
21. Turn off the starter switch.
2. Disconnect the ECU connector.
3. Turn on the starter switch.
Is the CHECK lamp always turned on?The CHECK
circuit is
short-circuited to
GND. Repair the
circuit.
Go to Step 7
The ECU has
failed. Replace
the ECU.
Go to Step 7
3Turn on the starter switch.
Is the CHECK lamp always turned off?
Go to Step 4Go to Step 6
4Turn on the starter switch.
Is the battery voltage observed between terminals 30 and 19?
Go to Step 5
The CHECK
circuit wires are
broken or the
CHECK lamp is
failed. Repair the
circuit.
Go to Step 7
5Turn off the starter switch.
Is the battery voltage observed between terminals 30 and 19?The battery is
short–circuited.
Repair the
CHECK lamp
circuit.
Go to Step 7
The ECU has
failed. Replace
the ECU.
Go to Step 7
6Turn on the starter switch.
Does the CHECK lamp go off two seconds after?The phenomenon
is not reproduced
Refer to
“Troubles
intermittently
observed”.
Go to Step 7
Go to Step 7
71. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 7

4B2–59 DRIVE LINE CONTROL SYSTEM (TOD)
Chart AIndicator drive circuit
Function of circuitThe circuit informs the indicator of the working condition of the ECU.
Fail conditionAll the TOD indicator lamps and CHECK lamp are lit, and go off momentarily at an inter-
val of about two seconds.
Indicator lamp status
—
Transfer positionTOD, 4L—
D04RW062

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

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

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

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