Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 636
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–64
Step
Action
Yes
No
1
1. Turn on the starter switch.
When the transfer lever is shifted to the high position, is 12V
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 12V
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 middle position between
4L and High, is 0V observed between terminals 31 and 46 (4H
switch)?
Replace the
ECU.
Go to Step 14
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 between 4L
and High, 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 middle 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 middle position between
4L and High, is the continuity established between terminals
(B–48)9 and (B–48)24 (4H switch)?
Go to Step 8
Go to Step 11
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 11
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?
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
The ECU has
tailed. Replace
the ECU.
Go to Step 14
10
When the transfer lever is shifted to the middle position between
4L and High, is the continuity established between terminals
(M–27)4 and (M–27)7?
The 4H switch
circuit is broken
between ECU
and transfer.
Repair the circuit.
Go to Step 14
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)7?
Repair the
transfer
assembly.
Go to Step 14
Go to Step 13
4B2–65
DRIVE LINE CONTROL SYSTEM (TOD)
Step
No
Yes
Action
13
Is the continuity established between transfer terminals (M–27)4
and body?
The harness is
shorted between
terminal (M-27)4
and GND. Repair
the circuit.
Go to Step 14
The ECU has
failed. Replace
the ECU.
Go to Step 14
14
Check that all the parts are mounted.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 14
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–66
Chart C–2
The 4H switch circuit is short-circuited to GND.
Function of circuit
—
Fail condition
When the transfer lever is shifted to 4L, the indicator lamp status is not changed.
Indicator lamp status
Transfer lever position
4L
4WD Auto Switch
D04RY00015
4B2–67
DRIVE LINE CONTROL SYSTEM (TOD)
Step
Action
Yes
No
1
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 14
2
When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 31 and 46 (4H switch)?
Go to Step 3
Go to Step 14
3
When the transfer lever is shifted to the 4L position, is 5V
observed between terminals 31 and 46 (4H switch)?
Go to Step 4
Go to Step 14
4
1. Turn off the starter switch.
Is the continuity established between terminals 14 and 17?
Go to Step 5
Replace TOD
indcator lamp
bulb or repair the
circuit.
Go to Step 23
5
Is the continuity established between terminals 14 and 6?
Go to Step 6
Replace TOD
indicator lamp
bulb or repair the
circuit.
Go to Step 23
6
Is the continuity established between terminals 14 and 18?
Go to Step 7
Replace TOD
indicator lamp
bulb or repair the
circuit.
Go to Step 23
7
Is the continuity established between terminals 14 and 19?
Go to Step 8
Replace TOD
indicator lamp
bulb or repair the
circuit.
Go to Step 23
8
Is the continuity established between terminals 14 and 8?
Go to Step 9
Replace TOD
indicator lamp
bulb or repair the
circuit.
Go to Step 23
9
1. Turn on the starter switch.
2. Shift the transfer lever is shifted to the 4L position.
Is 0 V observed between terminals 17 and 22?
Go to Step 10
The ECU has
failed. Replace
the ECU.
Go to Step 23
10
Is 0 V observed between terminals 6 and 22?
Go to Step 11
The ECU has
failed. Replace
the ECU.
Go to Step 23
11
Is 0 V observed between terminals 18 and 22?
Go to Step 12
The ECU has
failed. Replace
the ECU.
Go to Step 23
12
Is 12 V observed between terminals 19 and 22?
Go to Step 13
The ECU has
failed. Replace
the ECU.
Go to Step 23
13
Is 0 V observed between terminals 8 and 22?
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
The ECU has
failed. Replace
the ECU.
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