Isuzu Trooper (2000 year). Manual — part 110
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–60
Step
Action
Yes
No
1
When the 4WD Auto Switch is select to the 4WD position, is 0 V
observed between terminal 30 and 46 (4H switch)?
Go to Step 2
Repair the 4WD
Auto Switch
circuit.
Go to Step 7
2
When the 4WD Auto Switch is select to the 2WD position, is 12 V
observed between terminals 30 and 46 (4H switch)?
Go to Step 3
Repair the 4WD
Auto Switch
circuit.
Go to Step 7
3
1. Disconnect the ECU connector.
Is the continuity established between terminals (B–49)14 and
(B–49)17?
Go to Step 4
Replace TOD
indicator lamp
bulb.
Go to Step 7
4
Is the continuity established between terminals (B–49)14 and
(B–49)6?
Go to Step 5
Replace TOD
indicator lamp
bulb.
Go to Step 7
5
Is the continuity established between terminals (B–49)14 and
(B–49)18?
Go to Step 6
Replace TOD
indicator lamp
bulb.
Go to Step 7
6
Is the continuity established between terminals (B–49)14 and
(B–49)19?
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
4B2–61
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 Switch is 4WD mode.
When the lever is shifted from 4L to TOD, 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
D04RY00015
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–62
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 31 and 46 (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 31 and 46 (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 31 and 46 (4H switch)?
Replace the
ECU.
Go to Step 4
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 (B–48)9 and (B–48)24 (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 (B–48)9 and (B–48)24 (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 (B–48)9 and (B–48)24 (4H switch)?
The 4H switch
circuit battery is
short-circuited
between ECU
and transfer.
Repair the circuit.
Go to Step 14
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 (B–48)9 and (B–48)24
(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 (B–48)9 and (B–48)24?
Go to Step 10
Go to Step 9
9
When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–48)9 and (B–48)24?
Go to Step 14
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 10
10
When the transfer lever is shifted to the neutral position, is the
continuity established between terminals (M–27)4 and (M–27)7?
Go to Step 11
Repair the
transfer
assembly.
Go to Step 14
11
When the transfer lever is shifted to the high position, is the
continuity established between transfer connector terminals
(M–27)4 and (M–27)7?
Repair the
transfer
assembly.
Go to Step 14
Go to Step 12
12
When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(B–48)9 and (M–27)4?
Repair the
transfer
assembly.
Go to Step 14
Go to Step 13
4B2–63
DRIVE LINE CONTROL SYSTEM (TOD)
Step
No
Yes
Action
13
Is the continuity established between transfer terminals (M–27)4
and body?
The ECU has
failed. Replace
the ECU.
Go to Step 14
The harness is
broken between
terminal (M-27)4
and GND. Repair
the circuit.
Go to Step 14
14
Check that all the parts are mounted.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 14
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