Isuzu 2008MY N Series Workshop Manual page 274

Step
Measure insulation resistance of the cylinder #1
and #4 fuel injector between each fuel injector
terminal and a known good ground.
11
Is the resistance more than the specified
value?
Repair or replace the fuel injector harness.
12
Did you complete the repair or replace?
Important: Replacement
programmed.
Replace the appropriate fuel injector that was less
13
insulation resistance found at Step 11. Refer to
Injector in Section 1D Engine Fuel.
Did you complete the replacement?
Important:
programmed and learned.
14
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.
15 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.
16
Are there any DTCs that you have not
diagnosed?
Circuit/ System Testing DTC P2149
Step
Did you perform the Diagnostic System Check
1
- Engine Controls?
1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
2
4. Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition?
Action
injector
Replacement ECM
all previously disconnected
within the conditions
Action
Engine Control System (4HK1)
Value(s)
1MΩ
—
must be
—
must be
—
—
that you
—
Value(s)
—
—
Yes
Go to Step 12 Go to Step 13
Go to Step 15
Go to Step 15
Go to Step 15
Go to Step 3 Go to Step 16
Go to DTC List
Yes
Go to Diagnostic
System Check -
Go to Step 2 Engine Controls
Go to Diagnostic
Go to Step 3
1A-271
No
—
—
—
System OK
No
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