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
DTC Detection Strategy
Conditions For Setting The
DTC (Control Strategy)
Fault Locations
P0204
P0270
P0271
Hardware Circuit Checks
1. Circuit Open.
2. Circuit Short to Ground.
3. Circuit Short to Power Supply.
1. Sensor Circuit
2. Sensor
3. ECM
3. Schematic:
12
From Battery
Main Relay
Engine
Control
Module
Cylinder No.4 Fuel Injector
FE02-5069b
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.
Step 1
Initial Inspection
2-140
Control System JL4G18-D
Engine
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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