Isuzu 2008MY N Series User Manual

Engine Control System (4HK1) 1A-63
6
1. Turn OFF the ignition.
2. Disconnect the FRP sensor harness
connector.
3. Inspect for an intermittent, for poor
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.
5. Inspect for an intermittent, for poor
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?
—
Go to Step 11 Go to Step 7
7
Replace the FRP sensor. Refer to Fuel Pressure
Sensor in Section 1D Engine Fuel.
Did you complete the replacement?
—
Go to Step 11
—
8
Repair the short to ground between the ECM (pins
89 and 97 of E-12) and the FRP regulator (pin 2 of
E-17).
Did you compete the repair?
—
Go to Step 11
—
9
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
• 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?
—
Go to Step 11 Go to Step 10
10
1. Other possible causes for the no-start
condition:
• Engine mechanical timing
• Flywheel installed incorrectly causing the
crankshaft position (CKP) sensor to be
incorrectly timed to the engine.
Disconnect sensor and attempt to start
engine to verify.
• 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?
—
Go to Step 11
—
Step Action Value(s) Yes No
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Isuzu 2008MY N Series Specifications

General

Brand	Isuzu
Model	2008MY N Series
Category	Control Systems
Language	English