Isuzu N 2008 Series Workshop Manual page 73

1A-70 Engine Control System (4JJ1)
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,
10 cracks and for the use of proper clamps.
2. Repair or replace as necessary.
Did you find and correct the condition?
1. Turn OFF the ignition.
2. Disconnect
connector.
3. Inspect
connections and corrosion at the harness
connector of the FRP regulator (pins 1 and 2
of E17).
4. Disconnect the ECM harness connector.
11
5. Inspect
connections and corrosion at the harness
connector of the ECM (pins 89, 97, 105 and
113 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?
1. Turn OFF the ignition.
2. Disconnect
connector.
3. Inspect
connections and corrosion at the harness
connector of the FRP sensor (pins 1, 2 and 3
of E19).
4. Disconnect the ECM harness connector.
12
5. Inspect
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.
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
for an intermittent,
for an intermittent,
the FRP sensor
for an intermittent,
for an intermittent,
Value(s)
—
harness
for poor
—
for poor
harness
for poor
—
for 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
No
—
—
—