ECU OPEL FRONTERA 1998 Owner's Guide

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

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–70
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?The ECU has
failed. Replace
the ECU.
Go to Step 23
Go to Step 17
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-68)3?
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-68)3?
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-68)3?
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 (B-68)3?
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 (B-68)3?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 (B-68)3?
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) 4B2–72
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 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 (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 battery is
short-circuited
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)3 and (B–67)11?
Go to Step 10Go 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 13
Go to Step 10
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)
and floor
connector (H-49).
Repair the circuit.
Go to Step 11
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?
Go to Step 12
Repair the
transfer
assembly.
Go to Step 13
12When the transfer lever is shifted to the high position, is the
continuity established between transfer connector terminals
(A–3)12 and GND?Repair the
transfer
assembly.
Go to Step 13
Go to Step 13
13Check that all the parts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow”.
Return to Step 13

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–74
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 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”.
Go to Step 16
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

4B2–77 DRIVE LINE CONTROL SYSTEM (TOD)
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
switch shifted to 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”.
Go to Step 19
The ECU has
failed. Replace
the ECU.
Go to Step 19
7When the transfer lever is shifted 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 (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”.
Go to Step 19
The ECU has
failed. Replace
the ECU.
Go to Step 19
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 16
131. Turn on the starter switch.
When the 4WD 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 16
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

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–80
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
switch shifted to 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 SW to the 2WD position.
Is 12V observed between terminals 25 and 19?
Go to Step 5Go to Step 19
5Is 12V observed between terminals 26 and 19?Go to Step 6Go to Step 19
6Is 12V observed between terminals 27 and 19?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 19
The ECU has
failed. Replace
the ECU.
Go to Step 19
7When the 4WD SW is select 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
switch shifted to 4WD position, 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”.
Go to Step 19
The ECU has
failed. Replace
the ECU.
Go to Step 19
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. Connect the ECU connector.
2. Turn on the starter switch.
When the 4WD SW is select 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
switch shifted to 4WD position, is 0V observed on each VSV?
Go to Step 16
Repair the circuit
or replace the
VSV.
Go to Step 19

4B2–83 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
1Disconnect the ECU connector from ECU.
Is the continuity established between terminals (B–68)8 and
(B–67)11?
Go to Step 2
The ECU has
failed. Replace
the ECU.
Go to Step 3
2Is the self-diagnostic connector short-circuited?
Go to Step 3
Open the
self-diagnostic
connector.
Go to Step 3
31. Check that all the parts are mounted.
2. Clear the trouble codes.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Go to Step 3

4B2–85 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Disconnect ECU terminal.
2. Turn on the starter switch.
Is battery voltage observed between ECU terminals (B–68)1 and
(B–67)11?
Go to Step 2
Wirers are broken
lighting SW
circuit. Repair
the circuit.
Go to Step 4
2Turn lighting SW “ON”.
Is 0 V observed between ECU terminal (B–68)1 and (B–67)11?
Go to Step 3
Lighting SW
circuit battery
short. Repair the
circuit.
Go to Step 4
3Connect ECU terminal.
While the lighting switch is pressed on and off, does the
brightness of the indicator change?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
4Check that all the parts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow”.
Return to Step 4

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–88
StepActionYe sNo
1Are the front and rear tires in specified size?
Go to Step 2
Replace the tires
with specified
ones, and service
the new tires.
Go to Step 16
2Is the tire pressure correct?
Go to Step 3
Replace the tires
with specified
ones, and service
the new tires.
Go to Step 16
3Are the tires free from abnormal wear?
Go to Step 4
Replace the tires
with specified
ones, and service
the new tires.
Go to Step 16
4Are different types of tires used?
Go to Step 5
Replace the tires
with specified
ones, and service
the new tires.
Go to Step 16
51. Start the engine.
2. Shift the transfer lever to the high (TOD) position.
3. Fully turn the steering to the left (or right) end, and select the D
range and start the creep run.
Does the tight corner braking occur? Is the judder with chug-chug
sound observed? * Use caution on the operation.
Go to Step 6 Go to Step 11
61. Shift the transfer lever to the 2H position.
2. Fully turn the steering to the left (or right) end, and select the D
range and start the creep run.
Does the tight corner braking occur? Is the judder with chug-chug
sound observed? * Use caution on the operation.
Go to Step 7 Go to Step 14
7Is an LSD mounted to the rear differential? Go to Step 8 Go to Step 9
8Is the genuine LSD oil used in the rear differential?
Go to Step 9
Replace the
differential oil.
Go to Step 16
9Does the engine output the power correctly?
Go to Step 10
Check the
engine.
Go to Step 16
10Do the speed sensors work correctly? (Check trouble codes.)The ECU has
failed. Replace
the ECU.
Go to Step 16
Replace the
speed sensors.
Go to Step 16
11Is the tight corner braking observed only when the brake is
applied?
Go to Step 12
Conduct full
steering under
WOT.
Go to Step 5
121. Turn off the starter switch.
2. Disconnect the ECU connector.
Is the battery voltage observed between terminals (B–68)6 and
(B–67)11?
Go to Step 13
Repair the circuit
of terminal 6
(ABS IN).
Go to Step 16

4B2–89 DRIVE LINE CONTROL SYSTEM (TOD)
StepNo Ye s Action
131. Apply the brake and fully turn the steering to the left (or right)
end, and start the creep run.
Does the voltage between terminals 4 and 20 range between 0.1
and 1.0V?Repair the
transfer
assembly.
Go to Step 16The ECU has
failed. Replace
the ECU.
Go to Step 16
141. Shift the transfer lever to the high (TOD) position.
2. Fully turn the steering to the left (or right) end, and select the D
range and start the creep run.
Does the voltage between terminals 4 and 20 range between 0.1
and 1.0V?
Go to Step 15 Go to Step 13
151. Select the 4WD SW to the 2WD position.
2. Jack up the right front wheel.
Does the front tire rotate smoothly?
Repair the
transfer
assembly.
Go to Step 16
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 16
16Check that all the parts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow”.
Return to Step 16
*NOTE: Before checking this item, run the vehicle more
than 10 meters with the steering wheel in straight position
so that the 4L mechanical lock sleeve can be released
certainly.