Symptoms
Suspected Fault Items
Relevant Sections
Fault Definition: When the
ignition switch in the "ST"
position, the engine crankshaft
is not rotating.
2. Starter
3. Start Relay
4. Ignition Switch
5. BCM
"Engine Immobilizer System" in the
6. Engine Immobilizer System
Engine does not start, no sign
of the vehicle starting.
Fault Definition: When ignition
switch in the "ST" position, the
engine crankshaft rotates, but
no sign of the vehicle starting.
1. ECM Power Supply Circuit
2. Crankshaft Position Sensor
3. Camshaft Position Sensor
4. Ignition System
"Ignition System" in the
.
5. Fuel Pump Control Circuit
"Fuel System" in the
.
6. Fuel Injector Working Circuit
7. ECM
Engine difficult to start
Fault Definition: The engine
crankshaft rotation is normal,
but the vehicle can not be
started in a long time. The
engine is eventually started,
but it may stop immediately.
1. ECM Power Supply Circuit
2. Engine Coolant Temperature Sensor
.
3. Idle Air Control Valve (IAC) System
4. Fuel Pump Relay, Fuel Pump, Fuel
Injector, Fuel Contamination
"Fuel System" in the
.
5. Ignition System: Ignition Wire, Spark
Plug, Ignition Coil
"Ignition System" in the
.
6. Excessive Engine Oil in Combustion
Chamber and Valve Seal Leakage
"Mechanical System" in the
7. Excessive Carbon Residue in
Combustion Chamber
8. Incorrect Assembly
9. Incorrect Cylinder Compression
Pressure
Poor idle, Unstable, Inaccurate
or Stall
Fault Definition: Engine
running unstable during idle. In
extreme cases, the engine or
the vehicle will tremble. With
the throttle opening at a certain
1. ECM Power Supply Circuit
2. Air Cleaner Filter Blocked
---
3. Fuel Pressure Abnormal
"Fuel System" in the
.
4. Fuel Contamination
5. Injector Working Abnormal
2-38
Control System JL4G18-D
Engine
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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