Isuzu N 2008 Series Workshop Manual page 145

1A-142 Engine Control System (4JJ1)
Step
1. Test the signal circuit between the ECM (pin
107 of E12) and the CKP sensor (pin 1 of E20)
for a short to any 5 volts reference.
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2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Inspect for an intermittent and for poor
connections at the harness connector of the
CKP sensor (pins 1, 2 and 3 of E20).
14
2. Repair the connection(s) as necessary.
Did you find and correct the condition?
1. Turn OFF the ignition.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for poor
connections at the harness connector of the
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ECM (pins 95, 107, 108 and 109 of E12).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
1. Inspect the CKP sensor and sensor rotor for
the following conditions:
• Physical damage of sensor
• Loose or improper installation of sensor
• Excessive air gap
• Foreign material passing between sensor
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and sensor rotor
• Physical damage of sensor rotor
• Loose or improper installation of sensor
rotor
2. Repair or replace as necessary.
Did you find and correct the condition?
Replace the CKP sensor. Refer to CKP Sensor in
Section 1B Engine Mechanical.
17
Did you complete the replacement?
Important:
programmed and learned.
18
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
1. Reconnect
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
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5. Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition?
Observe the DTC Information with a scan tool.
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Are there any DTCs that you have not diagnosed?
Action
Replacement ECM
all previously disconnected
within the conditions
Value(s)
—
—
—
—
—
must be
—
—
that you
—
Yes
Go to Step 19 Go to Step 18
Go to Step 19 Go to Step 16
Go to Step 19 Go to Step 18
Go to Step 19 Go to Step 17
Go to Step 19
Go to Step 19
Go to Step 3 Go to Step 20
Go to DTC List
No
—
—
System OK