Isuzu N 2008 Series Workshop Manual page 90

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 E19).
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 E12).
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.
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Did you complete the replacement?
Replace the FRP sensor. Refer to Fuel Pressure
Sensor in Section 1D Engine Fuel.
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Did you complete the replacement?
Important: Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that was
leaking fuel found at Step 3 and inspect the engine
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mechanical for any damage or poor engine
compression. Refer to Injector in Section 1D
Engine Fuel.
Did you complete the replacement?
Important: Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that does not
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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?
Action
the FRP sensor harness
an intermittent, for
an intermittent, for
Engine Control System (4JJ1)
Value(s)
poor
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poor
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Yes
Go to Step 19 Go to Step 15
Go to Step 19
Go to Step 19
Go to Step 19
Go to Step 19
Go to Step 19
1A-87
No
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