Isuzu 4HL1 Workshop Manual page 101

Step
Check the harness between ECM and CKP
sensor for open wiring or short.
1. Disconnect the CKP sensor connector.
2. Jumper the CKP sensor connector pins
and measure the resistance at the ECM
7 connector.
Was the resistance within range?
Repair or replace the harness with open
wiring or short.
8
Is the action complete?
Check the CKP sensor.
1. At the CKP sensor connector pins,
measure the resistance.
9
Was the resistance within range?
Replace the CKP sensor.
10
Is the action complete?
Review the DTC.
1. Certainly connect the CKP sensor and
ECM connectors.
11
2. Using Tech 2, clear the DTC.
3. Perform test run and review the DTC.
Is DTC15 detected?
1. Replace the ECM.
IMPORTANT:
If necessary (for the vehicle equipped with
12
idle stop function), input the number of
startups to the replacing ECM.
Is the action complete?
Check DTC15 will not be set again.
1. Using Tech 2, clear the DTC.
13
2. Perform test run and review the DTC.
Is DTC15 detected?
Action
Engine Control System 1A-99
Value(s)
Pins 25-6
(jumpered:
pins 1-2): 0 Ω
(not jumpered):
∞ Ω
Pins 25/6-
ground
(jumpered:
pins 1/2-
ground): 0 Ω
(not jumpered):
∞ Ω
Go to Step 9
—
Verify repair and
go to Step 13
[Reference]
Approx.
20~250 Ω
Pin 1/2-
sensor body:
∞ Ω
Go to Step 11
Verify repair and
—
go to Step 13
—
Go to Step 12
—
Verify repair and
go to Step 13
—
Refer to
Diagnostic Aids
and go to Step 2
Yes No
Go to Step 8
Go to Step 10
Refer to
Diagnostic Aids
Repair is
complete
—
—
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