1998 OPEL FRONTERA ECU

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) 4B2–82
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

4B2–85 DRIVE LINE CONTROL SYSTEM (TOD)
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 13
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 is
short-circuited
between ECU
and transfer on
battery.Repair the
circuit.
Go to Step 13
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 11Go 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 12
The ECU has
failed.
Replace the
ECU.
Go to Step 13
10When the transfer lever is shifted to the neutral position, is the
continuity established between terminals (A–3)4 and (A–3)7?The 4H switch
circuit is broken
between ECU
and
transfer.Repair
the circuit.
Go to Step 13
Repair the
transfer
assembly.
Go to Step 13
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 13
Repair the 4HSW
circuit.
Go to Step 13
12When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(A–3)7 and (A–3)4?Repair the
transfer
assembly.
Go to Step 13
Repair the 4H
SW circuit.
Go to Step 13

4B2–89 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
indicator lamp
bulb, or repair the
circuit.
Go to Step 23
5Is the continuity established between terminals 1 and 26?
Go to Step 6
Replace TOD
indicator lamp
bulb, or repair the
circuit.
Go to Step 23
6Is the continuity established between terminals 1 and 27?
Go to Step 7
Replace TOD
indicator lamp
bulb, or repair the
circuit.
Go to Step 23
7Is the continuity established between terminals 1 and 28?
Go to Step 8
Replace TOD
indicator lamp
bulb, or repair the
circuit.
Go to Step 23
8Is the continuity established between terminals 1 and 29?
Go to Step 9
Replace TOD
indicator lamp
bulb, or repair the
circuit.
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”.
The ECU has
failed. Replace
the ECU.
Go to Step 23

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–90
StepNo Ye s Action
141. Turn off the starter switch.
2. Disconnect the ECU connector.
When the transfer lever is shifted to the neutral position, is the
continuity established between terminals (B–68)3 and (B–67)11
(4H switch)?
Go to Step 15Go to Step 17
15When the transfer lever is shifted to the high position, is the
continuity established between terminals (B–68)3 and (B–67)11?
Go to Step 17Go to Step 16
16When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–68)3 and (B–67)11?
Go to Step 17
The ECU has
failed. Replace
the ECU.
Go to Step 23
171. 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)6 and (B-67)11?
Go to Step 18Go to Step 20
18When the transfer lever is shifted to the high position, is the
continuity established between transfer connector terminals
(H-49)6 and (B-67)11?
Go to Step 20Go to Step 19
19When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(H-49)6 and (B-67)11?
Go to Step 20
GND is
short-circuited
between
terminals (B-68)3
and (H-49)6.
Repair the circuit.
Go to Step 23
201. 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)4 and (A-3)7?
Go to Step 21
Repair the
transfer
assembly.
Go to Step 23
21When the transfer lever is shifted to the high position, is the
continuity established between terminals (A-3)4 and (A-3)7?Repair the
transfer
assembly.
Go to Step 23
Go to Step 22
22When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (A-3)4 and (A-3)7?
Repair the
transfer
assembly.
Go to Step 23
GND is
short-circuited
between
terminals (B-68)3
and (A–3)4.
Repair the circuit.
Go to Step 23
23Check that all the parts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow”.
Return to Step 23

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–92
StepActionYe sNo
1Turn on the starter switch.
When 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 4
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 4
3When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 9 and 19 (4L switch)?The ECU has
failed. Replace
the ECU.
Go to Step 13
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 (B–68)4 and (B–67)11?
Go to Step 5Go to Step 7
5When the transfer lever is shifted to the neutral position, is 0V
observed between terminals (B–68)4 and (B–67)11?
Go to Step 6Go to Step 7
6When the transfer lever is shifted to the 4L position, is 0V
observed between terminals (B–68)4 and (B–67)11?The 4L switch
circuit is
short-circuited on
battery between
ECU and
transfer.Repair
the circuit.
Go to Step 13
Go to Step 7
7Turn off the starter switch.
When 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 12Go to Step 8
8When 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 9Go to Step 10
9When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–68)4 and (B–67)11?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 11
101. Disconnect the A–3 connector.
When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between transfer
connector terminals (A–3)12 and GND?Wires are broken
between transfer
connector
(A–3)12 and
connector
(B-68)4.Repair
the circuit.
Go to Step 13
Repair the
transfer
assembly.
Go to Step 13
11When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(A–3)12 and GND?Wires are broken
between transfer
connector
(A–3)12 and
connector
(B-68)4.Repair
the circuit.
Go to Step 13
Repair the
transfer
assembly.
Go to Step 13

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