Isuzu 2008MY N Series Workshop Manual page 163

1A-160 Engine Control System (4HK1)
Step
Important: The CMP sensor may be damaged if
the sensor signal circuit is shorted to a voltage
source.
1. Test the signal circuit between the ECM (pin
12
98 of E-12) and the CMP sensor (pin 1 of E-
18) for a short to battery or ignition voltage.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the signal circuit between the ECM (pin
98 of E-12) and the CMP sensor (pin 1 of E-
18) for a short to any 5 volts reference.
13
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
CMP sensor (pins 1, 2 and 3 of E-18).
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 87, 98, 100 and 101 of E-12).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
1. Inspect the CMP sensor and camshaft gear
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 camshaft gear
• Physical damage of camshaft gear
• Loose
camshaft gear
2. Repair or replace as necessary.
Did you find and correct the condition?
Replace the CMP sensor. Refer to CMP 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?
Action
or improper installation
Replacement ECM
Value(s)
—
—
—
—
—
of
—
must be
—
Yes
Go to Step 19 Go to Step 18
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
No
—
—