Isuzu 2008MY N Series Workshop Manual page 66

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.
6
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 FRP sensor. Refer to Fuel Pressure
Sensor in Section 1D Engine Fuel.
7
Did you complete the replacement?
Repair the short to ground between the ECM (pins
89 and 97 of E-12) and the FRP regulator (pin 2 of
8
E-17).
Did you compete the repair?
1. Check for normal readings at key up for the
following sensor inputs: Use the Scan Tool
Data List or a known good vehicle to
determine nominal values.
• Engine Coolant Temperature Sensor
• Barometric Pressure (BARO) Sensor
9
• Boost Pressure Sensor
• Intake Throttle Position Sensor
2. Repair the circuit(s) or replace the sensor as
necessary.
Did you find and correct the condition?
1. Other possible causes for the no-start
condition:
• Engine mechanical timing
• Flywheel installed incorrectly causing the
crankshaft position (CKP) sensor to be
incorrectly
Disconnect sensor and attempt to start
engine to verify.
10
• Heavily restricted intake or exhaust
plugged solid.
• Poor engine compression.
• Water or gasoline contamination in fuel.
2. Repair as necessary.
Did you find and correct the condition?
Action
the FRP sensor harness
an intermittent, for
an intermittent, for
timed to the engine.
Engine Control System (4HK1)
Value(s)
poor
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poor
—
—
—
—
Yes
Go to Step 11 Go to Step 7
Go to Step 11
Go to Step 11
Go to Step 11 Go to Step 10
Go to Step 11
1A-63
No
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—
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