Geely EC718 2009 Workshop Manual page 229

Engine
12
From Battery
4. Diagnostic Steps:
Note
– If the control system stores DTC other than misfire, diagnose these DTC first and eliminate the faults.
– If the vehicle does not have a misfire when sent to a service station, road test the vehicle, so that the misfire will
occur again. Use scan tool to record ECM data when misfire is occurring, in order to facilitate analyzing the cause
of the fault.
– If after a long period road test, ECM does not store any misfire associated DTC codes, then the fault may be due
to the following reasons:
• Overfill fuel tank and fuel enters into the evaporative emission control system, so that the mixture is too rich and
causes misfire.
• Use improper fuel caused poor combustion and misfire.
•
Contaminated spark plug causes the ignition failure and misfire.
•
Carry out basic checks at fault locations identified by DTC codes.
– Road test the vehicle after repair to confirm no DTC is stored.
Step 1 Initial inspection.
Fuel Injector
Main Relay
(a)
Control System JL4G18-D
Cylinder No.1 Fuel Injector
Cylinder No.2 Fuel Injector
Cylinder No.3 Fuel Injector
Cylinder No.4 Fuel Injector
Check the wiring harness connector for damage, poor
connection, aging or signs of loosening.
EC718/EC718RV EC715/EC715RV 10/2009
2-147
Engine
Control
Module
FE02-5076b