Symptoms
Suspected Faulty Items
Relevant Sections
20. Vacuum Hose Cracking or Kink, The
Connection Is Unreliable
21. Exhaust Blocked: Three-Way Catalytic
Converter Blocked, Muffler Internal Damage
Refer to
22. Braking System Dragging or Operation
Abnormal
Refer
23. Electromagnetic interference (EMI) on
voltage circuit may lead to misfire. Use a scan
tool to monitor the engine speed to detect
electromagnetic interference. Engine speed
parameter suddenly increase while the actual
engine speed is almost not changed, then there
is electromagnetic interference. If there is a
malfunction, check whether there is a high
voltage component in the vicinity of the ignition
control circuit.
-
Fuel Supply Stopped, Misfire
Fault Definition: Continuous pulsation
or jitter as the engine speed increases,
usually with the engine load increases it
is even more noticeable. When the
engine speed is above 1500 rpm, the
malfunction does not occur.
1. ECM Power Supply Circuit
Refer to
2. Air Filter Blocked
-
3. Fuel Pressure Abnormal
Refer to
4. Injector Working Abnormal
5. Mixture Too Rich
Refer to
6. Mixture Too Lean
7. Electronic Throttle Body
Refer to
8. Knock Sensor (KS) system ignition delay is
too great
Refer to
9. Spark Plug: Thermal value is incorrect, damp,
crack, gap incorrect, excessive erosion,
excessive carbon residue, contaminated by fuel
10. Spark Plug Wire Damage
11. Ignition Coil Damage
12. Crankshaft Position Sensor
Refer to
13. Too Much Oil In Combustion Chamber or
Valve Oil Seals Leakage
Refer to
in
14. Cylinder compression pressure is incorrect
15. Valve Stagnant or Leakage
2-608
Control System JL4G15-D
Engine
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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