LIGHTS/METERS/SWITCHES
21-9
COOLANT TEMPERATURE METER/ECT
SENSOR
SYSTEM INSPECTION
WHEN ENGINE IS HOT BUT NEEDLE DOES NOT
MOVE
Before performing the system inspection, check the
following:
– Battery condition
– Burned fuse
– Horn operation
Remove the side body cover (page 3-4).
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 tem-
perature meter needle move to "H".
The needle moves if the system circuit is normal.
In that case, check the ECT sensor (page 21-9).
If the needle does not move, check the following:
– Green/Blue wire between the ECT sensor and
speedometer for open or short circuit
– Black/Brown wire between the fuse box and
speedometer for open circuit
– Green/Black wire between the speedometer and
ground for open circuit
If the wires are normal, replace the speedometer
panel with a new one, and recheck.
After inspection, reset the self-diagnosis memory
data from the ECM (page 6-15).
ECT SENSOR INSPECTION
Remove the ECT sensor (page 6-52).
Suspend the ECT sensor in a pan of coolant on an
electric heating element and measure the resistance
between the ECT sensor terminal 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.
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 meter.
ECT SENSOR 3P (Gray)
CONNECTOR
JUMPER WIRE
COOLANT
TEMPERATURE
METER
TO
MAIN
RELAY
ECT SENSOR 3P (Gray)
CONNECTOR
CONNECTION: A – Ground
Temperature 50 °C (122 °F) 80 °C (176 °F)
Resistance 130 – 180 Ω 47 – 57 Ω
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