Isuzu 2008MY N Series Workshop Manual page 97

1A-94 Engine Control System (4HK1)
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.
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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 E-17).
4. Disconnect the ECM harness connector.
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5. Inspect
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
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
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 .
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Did you complete the replacement?
Replace the FRP sensor. Refer to Fuel Pressure
Sensor in Section 1D Engine Fuel.
15
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?
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 19 Go to Step 12
Go to Step 19 Go to Step 18
Go to Step 19 Go to Step 15
Go to Step 19
Go to Step 19
Go to Step 19
No
—
—
—