Step 5
check the engine coolant temperature sensor signal circuit.
FE02-5346b
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1 2 3
ECM Harness Connector EO01
Engine Coolant Temperature Sensor Harness
Connector EO23
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect the engine coolant temperature sensor wiring
harness connector EO23.
(c)
Disconnect ECM harness connector EO01.
(d)
Measure resistance between engine coolant temperature
sensor wiring harness connector EO23 terminal No.1 and
ECM harness connector terminal No.24. Check whether the
circuit is open.
(e)
Measure resistance between engine coolant temperature
sensor wiring harness connector EO23 terminal No.1 and a
reliable ground. Check whether the circuit is short to ground.
(f)
Measure voltage between engine coolant temperature
sensor wiring harness connector EO23 terminal No.1 and a
reliable ground. Check whether the circuit is short to power
supply.
Test Items
Standard Value
Resistance Between EO23 (1) and EO01
(24)
Less than 1 Ω
Resistance Between EO23 (1) and A
Reliable Ground
10 kΩ or higher
Voltage Between EO23 (1) and A Reliable
Ground
0 V
Next
Step 6
Check the engine coolant temperature sensor ground circuit.
Engine
Control System JL4G15-D
2-665
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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