Engine Coolant Temperature
B
C
A
FE02-5030b
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect the engine coolant temperature sensor wiring
harness connector EN23.
(c)
Measure engine coolant temperature sensor resistance.
Standard Resistance (Refer to the specific
parameters
Temperature Sensor Temperature and
(d)
Connect the engine coolant temperature sensor wiring
harness connector EN23.
Is resistance the specified value?
No
Replace the engine coolant temperature
sensor. Go to step 9
Yes
Step 3
Measure engine coolant temperature sensor signal circuit.
A
C
B
Engine Coolant Temperature Sensor
Harness Connector EN23
FE02-5031b
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect the engine coolant temperature sensor wiring
harness connector EN23.
(c)
Turn the ignition switch to "ON" position.
(d)
Measure voltage between engine coolant temperature
sensor EN23 terminal A and a reliable ground.
Standard Voltage: 4.7-5.5 V
(e)
Connect the engine coolant temperature sensor wiring
harness connector EN23.
Is voltage normal?
No
Yes
Step 4
Measure engine coolant temperature sensor ground circuit.
A
C
B
Engine Coolant Temperature Sensor
Harness Connector EN23
FE02-5032b
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect the engine coolant temperature sensor wiring
harness connector EN23.
(c)
Turn the ignition switch to "ON" position.
(d)
Measure resistance between engine coolant temperature
sensor wiring harness connector EN23 terminal No.C and a
reliable ground.
Standard Resistance: Less than 3 Ω
(e)
Connect the engine coolant temperature sensor wiring
harness connector EN23.
Is resistance normal?
No
Engine
Control System JL4G18-D
2-99
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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