LIGHTS/METERS/SWITCHES
22-14
COOLANT TEMPERATURE GAUGE/
ECT SENSOR
CIRCUIT INSPECTION
When engine is hot but gauge needle does not
move
Check the combination meter initial function (page
22-8).
If the coolant temperature gauge needle shows ini-
tial function but coolant temperature gauge does
not move at engine is hot, check the following:
Remove the luggage box (page 3-5).
Disconnect the ECM 33P connector.
Disconnect the ECT sensor 3P (Gray) connector.
Short the connector terminal of the wire harness
side and ground with the jumper wire.
Turn the ignition switch "ON", check the coolant
temperature gauge needle move to "H".
The needle moves if the system circuit is normal.
In that case, check the ECT sensor (page 22-14).
• If the needle does not move, check the Green/
Blue wire between the ECT sensor and combina-
tion meter for open or short circuit.
• If the wire is normal, replace the meter assembly
with a new one, and recheck.
ECT SENSOR INSPECTION
Remove the ECT sensor (page 6-74).
Suspend the ECT sensor in a pan of coolant (1:1
mixture) on an electric heating element and mea-
sure the resistance between the ECT sensor termi-
nal and body as the coolant heats up.
• Dip the ECT sensor in coolant up to its threads
while keeping the distance 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 reading. Do not let the
thermometer or ECT sensor touch the pan.
Measure the resistance between the ECT sensor ter-
minal and thread.
• If the resistance is out of above range by 10% at
any temperature listed, replace the ECT sensor.
Disconnect the
ECM connector or
failure code will be
stored in ECM.
CONNECTION: Green/Blue – Ground
Do not leave the
terminal connected
with jumper wire
for a long time, as it
causes damage to
the coolant temper-
ature gauge.
ECT SENSOR 3P
(Gray) CONNECTOR
COOLANT
TEMPERATURE
GAUGE
CONNECTION: A – Ground
Temperature
°C (°F)
50 80 100
Resistance
(kΩ)
6.8 – 7. 4 2 . 1 – 2.7 0.6 – 0.7
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