Isuzu 2008MY N Series Workshop Manual page 139

1A-136 Engine Control System (4HK1)
Step
1. Test the control circuit between the ECM and
the in-line harness connector for a short to the
common 2 charge voltage circuit.
10
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the control circuit between the ECM and
the in-line harness connector for a short to
battery or ignition voltage.
11
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the control circuit between the ECM and
the in-line harness connector for an open
circuit or high resistance.
12
2. Repair the connection(s) as necessary.
Did you find and correct the condition?
1. Test the cylinder #2 fuel injector circuits
between the fuel injector terminals and the in-
line harness connector for the following
conditions:
• An open circuit
13
• A short circuit each other
• High resistance
2. Repair the circuit(s) or replace the fuel injector
harness 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 a poor
connection at the harness connector of the
14
ECM.
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
Important: Replacement fuel injector must be
programmed.
Replace the cylinder #2 fuel injector. Refer to
15
Injector in Section 1D Engine Fuel.
Did you complete the replacement?
Important:
programmed and learned.
16
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
Action
Replacement ECM
Value(s)
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must be
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Yes
Go to Step 17 Go to Step 15
Go to Step 17 Go to Step 15
Go to Step 17 Go to Step 14
Go to Step 17 Go to Step 15
Go to Step 17 Go to Step 16
Go to Step 17
Go to Step 17
No
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