Isuzu Trooper (2000 year). Service manual — part 109
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–56
Step
Action
Yes
No
1
Turn on the starter switch.
Is the battery voltage observed between terminals 14 and 46 or 34
and 46?
The ECU has
failed. Replace
the ECU.
Go to Step 2
Check the battery
circuit.
Go to Step 2
2
Check that all the parts are mounted.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 2
4B2–57
DRIVE LINE CONTROL SYSTEM (TOD)
Chart B–1
The 4WD switch circuit wires are broken or short-circuited to the GND
Function of circuit
—
Fail condition
Even after the transfer position is select from TOD to 2H, the indicator lamp status is not
changed.
Indicator lamp status
—
Transfer position
2H
—
D04RY00015
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–58
Step
Action
Yes
No
1
1. Turn on the starter switch.
When the 4WD Auto Switch is select to the 4WD position, is 0 V
observed between terminal 30 and 46?
Go to Step 2
Repair the 4WD
Auto Switch
circuit.
Go to Step 4
2
When the 4WD Auto Switch is select to the 2WD position, is 12 V
observed between terminals 30 and 46?
Go to Step 3
Repair the 4WD
Auto Switch
circuit.
Go to Step 4
3
When the transfer lever is shifted to the 4L position, is battery
boltage observed between terminals 19 and 46?
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 4
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
4B2–59
DRIVE LINE CONTROL SYSTEM (TOD)
Chart B–2
The 4WD AUTO SWITCH circuit is short to battery.
Function of circuit
—
Fail condition
Even after the transfer mode is select from 2H to TOD.
Indicator lamp status
Transfer position
TOD
D04RY00015
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