Is fault solved?
Yes
System normal
No
Step 7
Repair ECM power supply circuits.
(a)
Repair ECM power supply circuit. Refer to
.
Is fault solved?
Yes
System normal.
No
Step 8
Replace ECM.
(a)
Connect scan tool.
(b)
Turn the ignition switch to "ON" position.
(c)
Scan ECM DTC codes, repair ECM Repair the faulty part. if
necessary, replace ECM. Refer to
(d)
Carry out crankshaft self learn after ECM replacement. Refer
to
Crankshaft Position Sensor (CKP) Learn
(e)
Clear malfunction code.
Next
Step 9
System normal.
2.12.7.49 DTC P0685
1. DTC Descriptor:
DTC
P0685
Main Relay Malfunction
Main relay is used to provide power to fuel injectors and oxygen sensors and other components. Battery provides power to main
relay terminal No.2. ECM controls main relay ground through ECM harness connector EO35 terminal No.62. ECM has a detection
circuit. By monitoring the feedback voltage, ECM determines whether the control circuit is open, short to ground or short to power
supply.
2. Conditions For Setting DTC and The Fault Location:
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC
(Control Strategy)
Fault Locations
P0685
Main Relay Malfunction
The main relay circuit control state
does not match ECM expected
status.
1. Main Relay Circuit
2. Main Relay
3. ECM
2-766
Control System JL4G15-D
Engine
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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