Isuzu Trooper (1998-2002 year). Service manual — part 149
4B2–83
DRIVE LINE CONTROL SYSTEM (TOD)
Chart C–1
4H switch circuit wires are broken or the battery is short-circuited.
Function of circuit
—
Fail condition
When the 4WD AUTO SW is 4WD mode.
When the lever is shifted from 4L to HIGH, the 4L mode remains on the indicator and the
TOD mode is displayed without turning off the previous mode.
Indicator lamp status
Transfer position
4L <——> Neutral <——> TOD
D04RY00114
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–84
D04RY00115
4B2–85
DRIVE LINE CONTROL SYSTEM (TOD)
Step
Action
Yes
No
1
1. 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 2
Go to Step 4
2
When the transfer lever is shifted to the 4L position, is 5V
observed between terminals 8 and 19 (4H switch)?
Go to Step 3
Go to Step 4
3
When 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
4
1. 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 5
Go to Step 7
5
When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 8 and 19 (4H switch)?
Go to Step 6
Go to Step 7
6
When 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
7
Turn 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 8
Go to Step 10
8
When the transfer lever is shifted to the high position, is the
continuity established between terminals 8 and 19?
Go to Step 11
Go to Step 9
9
When 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
10
When 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
11
When 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
12
When 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
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–86
Step
No
Yes
Action
13
Check that all the parts are mounted.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 13
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