Isuzu 2000 Trooper Workshop Manual page 456

4B2–78 DRIVE LINE CONTROL SYSTEM (TOD)
Step
16 When the transfer lever is shifted to the 4L position, is 0V
observed on each VSV?
17 Is the vacuum pressure supplied to the VSV?
18 Can the single AXLE switch enable and disable the continuity?
19 Check that all the parts are mounted.
Is this step complete?
Action Yes
Repair the circuit
of replace the
Go to Step 17 Go to Step 19
Repair the
vacuum system.
Go to Step 19
Go to Step 18
Repair the shift Replace the
on the fly system AXLE switch
(refer to Section (refer to Section
4B1 "Driveline 4B1 "Driveline
Control System"). Control System").
Go to Step 19 Go to Step 19
Repeat the
"Diagnosis Flow". Return to Step 19
No
VSV.