Isuzu 4HL1 Workshop Manual page 160

Engine control system
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1A-158 Engine Control System
Step
Review the DTC.
1.
Using Tech 2, check and store the DTC.
2.
Clear the DTC.
3.
Start the engine. Run the engine at idle
3
for 1 minute.
4.
Review the DTC.
Is DTC71 detected?
1.
Replace the VIM.
IMPORTANT:
If necessary (for the vehicle equipped with
4
idle stop function), input the number of
startups to the replacing VIM.
Is the action complete?
Check DTC71 will not be set again.
1.
Using Tech 2, clear the DTC.
5
2.
Perform test run and review the DTC.
Is DTC71 detected?
Action
Value(s)
Yes
Go to Step 4
Verify repair and
go to Step 5
Refer to
Diagnostic Aids
and go to Step 1
No
Refer to
Diagnostic Aids
Repair is
complete

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