Engine Coolant Temperature (Ect) Sensor Inspection - Honda TRX450R Service Manual

ELECTRICAL ('04 - '05)
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR
INSPECTION
Drain the coolant (page 9-7).
Disconnect the ECT sensor connector and remove
the ECT sensor.
Suspend the ECT sensor in a pan of coolant (50 - 50
mixture) on an electric heating element and mea-
sure the resistance through the sensor as the cool-
ant heats up.
NOTE:
• Soak the ECT sensor in coolant up to its threads
with at least 40 mm (1.57 in) from the bottom of
the pan to the bottom of the sensor.
• Keep the temperature constant for 3 minutes
before testing. A sudden change of temperature
will result in incorrect readings. Do not let the
thermometer or ECT sensor touch the pan.
Resistance: 47.5 - 57 Q at 80 C (176 F)
14.8 - 17.3 ii at 120°C (248°F)
Replace the ECT sensor if it is out of specifications
by more than 10% at any temperature listed.
Apply sealant to the ECT sensor threads. Do not
apply to the sensor head.
Install the ECT sensor and tighten it.
TORQUE: 9.8 N m (1.0 kgfm, 7 Ibf-ft)
Connect the ECT sensor connector.
Fill and bleed the cooling system (page 9-7).
THERMOMETER
ECT SENSOR
20-24