Isuzu 2000 Trooper Workshop Manual page 440

4B2–62 DRIVE LINE CONTROL SYSTEM (TOD)
Step
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)?
2 When the transfer lever is shifted to the 4L position, is 5V
observed between terminals 31 and 46 (4H switch)?
3 When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 31 and 46 (4H switch)?
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)?
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)?
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)?
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)?
8 When the transfer lever is shifted to the high position, is the
continuity established between terminals (B–48)9 and (B–48)24?
9 When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–48)9 and (B–48)24?
10 When the transfer lever is shifted to the neutral position, is the
continuity established between terminals (M–27)4 and (M–27)7?
11 When the transfer lever is shifted to the high
continuity established between transfer connector terminals
(M–27)4 and (M–27)7?
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?
Action
position, is the
Yes
Go to Step 2 Go to Step 4
Go to Step 3 Go to Step 4
Replace the
ECU.
Go to Step 4 Go to Step 4
Go to Step 5 Go to Step 7
Go to Step 6 Go to Step 7
The 4H switch
circuit battery is
short-circuited
between ECU
and transfer.
Repair the circuit.
Go to Step 7
Go to Step 14
Go to Step 8 Go to Step 10
Go to Step 10 Go to Step 9
The phenomenon
reproduced.
"Troubles
intermittently
observed".
Go to Step 14 Go to Step 10
Repair the
assembly.
Go to Step 11 Go to Step 14
Repair the
transfer
assembly.
Go to Step 12
Go to Step 14
Repair the
transfer
assembly.
Go to Step 13
Go to Step 14
No
is not
Refer to
transfer