Isuzu 2008MY N Series Workshop Manual page 242

Step
Replace the FRP sensor. Refer to Fuel Pressure
Sensor in Section 1D Engine Fuel.
13
Did you complete the replacement?
Important: Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that does not
14
change engine speed when commanded OFF.
Refer to Injector in Section 1D Engine Fuel.
Did you complete the replacement?
Important: The fuel supply pump must be timed to
the engine and adjustment value must be learned
to the ECM.
Notice: Always replace the fuel filter element when
15
a fuel supply pump is replaced.
Replace the fuel supply pump and fuel filter
element. Refer to Fuel Supply Pump and Fuel Filter
Element in Section 1D Engine Fuel.
Did you complete the replacement?
Notice: There is a possibility that the pressure
limiter valve stuck open or operating pressure has
fallen.
16
Replace the pressure limiter valve. Refer to
Pressure Limiter in Section 1D Engine Fuel.
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.
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5. Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle within
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition?
Observe the DTC Information with a scan tool.
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Are there any DTCs that you have not
diagnosed?
Action
all previously disconnected
the conditions that
Engine Control System (4HK1)
Value(s)
—
—
—
—
—
you
—
Yes
Go to Step 17
Go to Step 17
Go to Step 17
Go to Step 17
Go to Step 2 Go to Step 18
Go to DTC List
1A-239
No
—
—
—
—
System OK