Isuzu 4HL1 Workshop Manual page 97

Step
Check the harness between ECM and CMP
sensor for open wiring or short.
1. Disconnect the CMP sensor connector.
2. Jumper the CMP sensor connector pins
and measure the resistance at the ECM
connector.
Was the resistance within range?
7
Repair or replace the faulty harness.
8
Is the action complete?
Check the CMP sensor.
1. At the CMP sensor connector pins,
measure the resistance.
Was the resistance within range?
9
Replace the CMP sensor.
10
Is the action complete?
Review the DTC.
1. Certainly connect the CMP sensor and
ECM connectors.
11
2. Using Tech 2, clear the DTC.
3. Perform test run and review the DTC.
Is DTC14 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 DTC14 will not be set again.
1. Using Tech 2, clear the DTC.
13
2. Perform test run and review the DTC.
Is DTC14 detected?
Action
Engine Control System 1A-95
Value(s)
Pins 27-8
(jumpered:
pins 2-3): 0 Ω
(not jumpered):
∞ Ω
Pins 26-8
(jumpered:
pins 1-3): 0 Ω
(not jumpered):
∞ Ω
Pins 26-27
(jumpered:
pins 1-2): 0 Ω
(not jumpered):
∞ Ω
Pins 26/27/8-
ground: ∞ Ω
Go to Step 9
Verify repair and
—
go to Step 13
[Reference]
Pins 1-2: ∞Ω
Pins 2-3:
Approx.
120~130 Ω
Pins 1-3: ∞ Ω
Pin 1/2/3-
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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