Isuzu 2008MY N Series Workshop Manual page 141

1A-138 Engine Control System (4HK1)
Step
1. Inspect for an intermittent and for poor
connections at the in-line harness connector.
7
2. Repair the connection(s) as necessary.
Did you find and correct the condition?
1. Remove the cylinder head cover. Refer to
Cylinder Head Cover in Section 1B Engine
Mechanical.
2. Inspect the fuel injector harness for loose
injector terminal nuts, objects touching injector
terminals.
8
3. Inspect for an intermittent and for poor
connections at the in-line harness connector.
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
Repair the open circuit or high resistance on the
charge voltage circuits between the ECM and the
in-line harness connector, then between the in-line
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harness connector and the fuel injector terminal.
Did you complete the repair?
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 #3 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?
Action Value(s) Yes
—
Go to Step 17
—
Go to Step 17
—
Go to Step 17
—
Go to Step 17
—
Go to Step 17
—
Go to Step 17
—
Go to Step 17
—
Go to Step 17
No
Go to Step 8
Go to Step 13
—
Go to Step 15
Go to Step 15
Go to Step 14
Go to Step 15
Go to Step 16