Isuzu Trooper (2000 year). Manual — part 112
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–68
Step
Action
Yes
No
1
Turn on the starter switch.
When the transfer lever is shifted to the high position, is 5V
observed between terminals 44 and 46 (4L switch)?
Go to Step 2
Go to Step 4
2
When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 44 and 46 (4L switch)?
Go to Step 3
Go to Step 4
3
When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 44 and 46 (4L switch)?
The ECU has
failed. 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)22 and (B–48)24 (4L 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)22 and (B–48)24 (4L switch)?
Go to Step 6
Go to Step 7
6
When the transfer lever is shifted to the 4L position, is 0V
observed between terminals (B–48)22 and (B–48)24 (4L switch)?
The 4L switch
circuit battery is
short-circuited
between ECU
and transfer.
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 high position, is the
continuity established between terminals (B–48)22 and (B–48)24
(4L switch)?
Go to Step 10
Go to Step 8
8
When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(B–48)22 and (B–48)24 (4L switch)?
Go to Step 9
Go to Step 10
9
When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–48)22 and (B–48)24
(4L switch)?
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 13
Go to Step 10
10
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 transfer
connector terminals (M-27)12 and GND?
Wires are broken
between transfer
connector (M-27)
and floor
connector (H-17).
Repair the circuit.
Go to Step 11
Repair the
transfer
assembly.
Go to Step 13
11
When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(M-27)12 and GND?
Go to Step 12
Repair the
transfer
assembly.
Go to Step 13
4B2–69
DRIVE LINE CONTROL SYSTEM (TOD)
Step
No
Yes
Action
12
When the transfer lever is shifted to the high position, is the
continuity established between transfer connector terminals
(M-27)12 and GND?
Repair the
transfer
assembly.
Go to Step 13
Go to Step 13
13
Check that all the parts are mounted.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 13
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–70
Chart D–2
The 4L switch circuit is short-circuited to GND.
Function of circuit
—
Fail condition
The 4L mode is displayed even in the 2H or TOD.
Indicator lamp status
Transfer position
2H or TOD
D04RY00006
4B2–71
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 44 and 46 (4L switch)?
Go to Step 2
Go to Step 7
2
When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 44 and 46 (4L switch)?
Go to Step 3
Go to Step 7
3
When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 44 and 46 (4L switch)?
Go to Step 4
Go to Step 7
4
1. Select the 4WD Auto Switch to the 2H position.
Is 12V observed between terminals 17 and 46?
Go to Step 5
The ECU has
failed. Replace
the ECU.
Go to Step 16
5
Is 12V observed between terminals 6 and 46?
Go to Step 6
The ECU has
failed. Replace
the ECU.
Go to Step 16
6
Is 12V observed between terminals 18 and 46?
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 16
The ECU has
failed. Replace
the ECU.
Go to Step 16
7
1. Turn off the starter switch.
2. Disconnect the ECU connector.
When the transfer lever is shifted to the neutral position between
High and 4L, is the continuity established between terminals
(B–48)22 and (B–48)24?
Go to Step 8
Go to Step 10
8
When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–48)22 and
(B–48)24?
Go to Step 9
Go to Step 10
9
When the transfer lever is shifted to the high position, is the
continuity established between terminals (B–48)22 and
(B–48)24?
Go to Step 10
The ECU has
failed. Replace
the ECU.
Go to Step 16
10
1. Disconnect the M-17 connector.
When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(H-17)6 and (B-48)24?
Go to Step 11
Go to Step 13
11
When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(H-17)6 and (B-48)24?
Go to Step 12
Go to Step 13
12
When the transfer lever is shifted to the high position, is the
continuity established between terminals (H-17)6 and (B-48)24?
Go to Step 13
GND is
short-circuited
between
terminals
(B–48)22 and
(H-17)6. Repair
the circuit.
Go to Step 16
13
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)12 and GND?
Go to Step 14
Repair the
transfer
assembly.
Go to Step 16
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