Isuzu 2000 Trooper Workshop Manual page 438

4B2–60 DRIVE LINE CONTROL SYSTEM (TOD)
Step
1 When the 4WD Auto Switch is select to the 4WD position, is 0 V
observed between terminal 30 and 46 (4H switch)?
2 When the 4WD Auto Switch is select to the 2WD position, is 12 V
observed between terminals 30 and 46 (4H switch)?
3 1. Disconnect the ECU connector.
Is the continuity established between terminals (B–49)14 and
(B–49)17?
4 Is the continuity established between terminals (B–49)14 and
(B–49)6?
5 Is the continuity established between terminals (B–49)14 and
(B–49)18?
6 Is the continuity established between terminals (B–49)14 and
(B–49)19?
7 Check that all the parts are mounted.
Is this step complete?
Action Yes
Repair the 4WD
Auto Switch
Go to Step 2 Go to Step 7
Repair the 4WD
Auto Switch
Go to Step 3
Go to Step 7
Replace TOD
indicator lamp
Go to Step 4
Go to Step 7
Replace TOD
indicator lamp
Go to Step 5
Go to Step 7
Replace TOD
indicator lamp
Go to Step 6
Go to Step 7
Replace TOD
indicator lamp
Replace ECU.
Go to Step 7
Go to Step 7
Repeat the
Return to Step 7
"Diagnosis Flow".
No
circuit.
circuit.
bulb.
bulb.
bulb.
bulb.