Isuzu 4HL1 Workshop Manual page 139

Step
Check the between ECM to ITP sensor
harness for open wiring or short.
1. Starter switch "OFF".
2. Disconnect the ECM.
3. Disconnect the Intake throttle connector.
4. Jumper the Intake throttle connector and
measure the resistance at the ECM
connector.
14
Was the resistance within range?
Repair or replace the faulty harness.
15
Is the action complete?
Check the ITP sensor.
1. Test the continuity between ITP sensor
connector pins.
16
Does the ITP sensor meet the requirements?
Replace the Intake trottle (ITP sensor).
17
Is the action complete?
Review the DTC.
1. Certainly connect the ITP sensor and
ECM connectors.
18
2. Using Tech 2, clear the DTC.
3. Perform test run and review the DTC.
Is DTC43 detected?
1. Replace the ECM.
IMPORTANT:
If necessary (for the vehicle equipped with
19
idle stop function), input the number of
startups to the replacing ECM.
Is the action complete?
Check DTC43 will not be set again.
1. Using Tech 2, clear the DTC.
20
2. Perform test run and review the DTC.
Is DTC43 detected?
Action
Engine Control System 1A-137
Value(s)
Pins 69-64
(jumpered:
1-2): 0 Ω
(not jumpered):
∞ Ω
Pins 69-63
(jumpered:
2-4): 0 Ω
(not jumpered):
Pins 64-63
(jumpered:
1-4): 0 Ω
(not jumpered):
∞ Ω
Pins 64/69/
63-ground
(not jumpered):
∞ Ω
Go to Step 16
Verify repair and
—
go to Step 20
Pins 1-2,
Pins 2-4,
Pins 1/2/4-
3/5:
Discontinued
Pins 1-4:
Continued Go to Step 18
Verify repair and
—
go to Step 20
—
Go to Step 19
—
Verify repair and
go to Step 20
—
Refer to
Diagnostic Aids
and go to Step 2
Yes No
Go to Step 15
Go to Step 15
Refer to
Diagnostic Aids
Repair is
complete
—
—
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