Geely EC718 2009 Workshop Manual page 222

2-140 Control System JL4G18-D
Fuel injector operating voltage is provided by The Main Relay which is controlled by ECM. Battery voltage passes through the main
relay terminal No.3 to all fuel injector wiring harness connectors terminal No.1. ECM controls fuel injector ground circuit by ECM
harness connector EN01 terminal No.64. ECM monitors all fuel injector driver circuit status, if ECM detects driving circuit
corresponding voltage is incorrect, ECM will set up a fuel injector control circuit fault DTC code.
2. Conditions For Setting DTC and The Fault Location:
DTC Code
P0204
P0270 Hardware Circuit Checks
P0271
3. Schematic:
12
From Battery
4. Diagnostic Steps:
Note
Before carrying out this diagnosis step, observe the data list on scan tool and analyze the accuracy of the data, as
these will help with quick diagnosis.
Initial Inspection
Step 1
EC718/EC718RV EC715/EC715RV 10/2009
DTC Detection Strategy
Main Relay
Conditions For Setting The
DTC (Control Strategy)
1. Circuit Open.
2. Circuit Short to Ground.
3. Circuit Short to Power Supply.
Cylinder No.4 Fuel Injector
Engine
Fault Locations
1. Sensor Circuit
2. Sensor
3. ECM
Engine
Control
Module
FE02-5069b