Isuzu Trooper (2000 year). Service manual — part 111
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–64
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 position
4L
D04RY00015
4B2–65
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.
Go to Step 23
5
Is the continuity established between terminals 14 and 6?
Go to Step 6
Replace TOD
indicator lamp
bulb.
Go to Step 23
6
Is the continuity established between terminals 14 and 18?
Go to Step 7
Replace TOD
indicator lamp
bulb.
Go to Step 23
7
Is the continuity established between terminals 14 and 19?
Go to Step 8
Replace TOD
indicator lamp
bulb.
Go to Step 23
8
Is the continuity established between terminals 14 and 8?
Go to Step 9
Replace TOD
indicator lamp
bulb.
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 0 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”.
Go to Step 23
The ECU has
failed. Replace
the ECU.
Go to Step 23
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–66
Step
No
Yes
Action
14
1. Turn off the starter switch.
2. Disconnect the ECU connector.
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 15
Go to Step 17
15
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 17
Go to Step 16
16
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 17
The ECU has
failed. Replace
the ECU.
Go to Step 23
17
1. Disconnect the H–17 connector.
When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(H-17)3 and (B-48)9?
Go to Step 18
Go to Step 20
18
When the transfer lever is shifted to the high position, is the
continuity established between transfer connector terminals
(H-17)3 and (B-48)9?
Go to Step 20
Go to Step 19
19
When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(H-17)3 and (B-48)9?
Go to Step 20
GND is
short-circuited
between
terminals (B-48)9
and (H-17)3.
Repair the circuit.
Go to Step 23
20
1. Disconnect the M–27 connector.
When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(M-27)4 and (B-48)9?
Go to Step 21
Repair the
transfer
assembly.
Go to Step 23
21
When the transfer lever is shifted to the high position, is the
continuity established between terminals (M-27)4 and (B-48)9?
Repair the
transfer
assembly.
Go to Step 23
Go to Step 22
22
When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (M-27)4 and (B-48)9?
Repair the
transfer
assembly.
Go to Step 23
GND is
short-circuited
between
terminals (B-48)9
and (M–27)4.
Repair the circuit.
Go to Step 23
23
Check that all the parts are mounted.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 23
4B2–67
DRIVE LINE CONTROL SYSTEM (TOD)
Chart D–1
4L switch circuit wires are broken or the battery is short-circuited.
Function of circuit
—
Fail condition
The TOD mode is displayed in the neutral position between high and 4L. When the lever
is shifted to the 4L position, the TOD mode is displayed.
Indicator lamp status
Transfer position
4L
Neutral
D04RY00004
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