Isuzu Trooper (1998-2002 year). Service manual — part 148
4B2–79
DRIVE LINE CONTROL SYSTEM (TOD)
Step
Action
Yes
No
1
1. 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
2
When 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
3
When 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
4
Check 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–2
The 4WD AUTO switch circuit is short to battery.
Function of circuit
—
Fail condition
Even after the transfer mode is selected from 2H to TOD, the indicator lamp status dose
not change.
Indicator lamp status
Transfer position
TOD
D04RY00114
4B2–81
DRIVE LINE CONTROL SYSTEM (TOD)
D04RY00115
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–82
Step
Action
Yes
No
1
When 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
2
When 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
3
1. 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
4
Is 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
5
Is 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
6
Is 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
7
Check that all the parts are mounted.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 7
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