High Resistance; Repair The Circuit(S) As Necessary - Isuzu 2008MY N Series Workshop Manual

1A-134 Engine Control System (4HK1)
Step
1. Test the cylinder #1 fuel injector circuit
between the fuel injector terminals and the in-
line harness connector for the following
conditions:
• An open circuit
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• 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 #1 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?
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.
17
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.
18
Are there any DTCs that you have not
diagnosed?
Circuit/ System Testing DTC P0202
Step
Did you perform the Diagnostic System Check
1
- Engine Controls?
Action
Replacement ECM
all previously disconnected
within the conditions
Action
Value(s)
—
—
—
must be
—
—
that you
—
Value(s)
—
Yes
Go to Step 17 Go to Step 15
Go to Step 17 Go to Step 16
Go to Step 17
Go to Step 17
Go to Step 3 Go to Step 18
Go to DTC List
Yes
Go to Diagnostic
System Check -
Go to Step 2 Engine Controls
No
—
—
System OK
No