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ECM Harness Connector EN01
A
C
B
Engine Coolant Temperature Sensor
Harness Connector EN23
FE02-5034b
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect the engine coolant temperature sensor wiring
harness connector EN23.
(c)
Disconnect ECM harness connector EN01.
(d)
Measure resistance between engine coolant temperature
sensor wiring harness connector EN23 terminal C and ECM
harness connector terminal No.40. Check whether the circuit
is open. If there is no open circuit, repair the faulty part.
(e)
Measure voltage between engine coolant temperature
sensor wiring harness connector EN23 terminal C and a
reliable ground. Check whether there is a short circuit. If there
is no short circuit, repair the faulty part.
Test Items
Standard Value
Resistance Between EN23 (C) and EN01
(40)
Less than 1 Ω
Voltage Between EN23 (C) and a Reliable
Ground
0 V
Execute next step as per normal.
Next
Step 7
Check ECM power supply circuit.
(a)
Check whether ECM power supply circuit is normal.
(b)
Check whether ECM ground circuit is normal.
No
Repair the faulty part.
Yes
Step 8
Replace ECM.
Next
Step 9
Use scan tool to confirm whether the DTC code is stored again.
(a)
Connect scan tool to the datalink connector.
(b)
Turn the ignition switch to "ON" position.
(c)
Clear DTC code.
(d)
Start and run the engine at idle speed to warm up the engine
for at least 5 min.
(e)
Read control system DTC code again to confirm that the
system has no DTC code.
No
Intermittent Fault. Refer to
Engine
Control System JL4G18-D
2-101
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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