Isuzu 2008MY N Series Workshop Manual page 80

Step
1. Inspect the fuel system line connections
between the fuel tank and the fuel supply
pump for tightness and all fuel hoses for cuts,
cracks and for the use of proper clamps.
10
2. Repair or replace as necessary.
Did you find and correct the condition?
1. Turn OFF the ignition.
2. Disconnect
connector.
3. Inspect for
connections and corrosion at the harness
connector of the FRP regulator (pins 1 and 2
of E-17).
4. Disconnect the ECM harness connector.
11
5. Inspect for
connections and corrosion at the harness
connector of the ECM (pins 89, 97, 105 and
113 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?
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.
12
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?
Action
the FRP regulator harness
an intermittent, for
an intermittent, for
the FRP sensor harness
an intermittent, for
an intermittent, for
Engine Control System (4HK1)
Value(s)
—
poor
—
poor
poor
—
poor
—
—
—
Yes
Go to Step 17 Go to Step 11
Go to Step 17 Go to Step 16
Go to Step 17 Go to Step 14
Go to Step 17
Go to Step 17
Go to Step 17
1A-77
No
—
—
—