Isuzu 2008MY N Series Workshop Manual page 86

Step
1. Turn OFF the ignition.
2. Disconnect
connector.
3. Inspect for
connections and corrosion at the harness
connector of the FRP sensor (pins 1, 2 and 3
of E-19).
4. Disconnect the ECM harness connector.
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5. Inspect for
connections and corrosion at the harness
connector of the ECM (pins 82, 87, 90 and
101 of E-12).
6. Test for high resistance on each circuit.
7. Repair the connection(s) or circuit(s) as
necessary.
Did you find and correct the condition?
Replace the fuel filter element. Refer to Fuel Filter
Element in Section 1D Engine Fuel .
13
Did you complete the replacement?
Replace the FRP sensor. Refer to Fuel Pressure
Sensor in Section 1D Engine Fuel.
14
Did you complete the replacement?
Important: Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that does not
15
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
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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?
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 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
the FRP sensor harness
an intermittent, for
an intermittent, for
all previously disconnected
the conditions that
Engine Control System (4HK1)
Value(s)
poor
—
poor
—
—
—
—
—
you
—
Yes
Go to Step 17 Go to Step 14
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-83
No
—
—
—
—
System OK