Ect Sensor Circuit Inspection - Honda 2003 NPS50 Ruckus Service Manual

LIGHTS/METERS/SWITCHES

3. ECT Sensor Circuit Inspection

Remove the floor step (page 3-7).
Warm up the engine to normal operating tem­
perature.
Stop the engine and disconnect the ECT sensor
connector White wire.
Ground the white wire with a suitable jumper
wire.
Start the engine and make sure the indicator
lights after 10 seconds.
Does the indicator light?
NO
YES
When the indicator always lights during a operation
1 . Coolant Temperature Indicator Circuit Inspec­
tion (short circuit)
Remove the inner cover (page 3-5).
Turn the ignition switch to ON (engine not
started) and check that the indicator lights.
Does the indicator lights?
NO
YES
2. ECT Sensor Circuit Inspection
Remove the floor step (page 3-7).
Disconnect the ECT sensor White wire connec­
tor.
Ground the White wire with a suitable jumper
wire.
Start the engine, check that the i ndicator lights.
Does the indicator light?
NO
YES
1 9- 1 6
•
•
- An open circuit in the White wire
•
between the ECM and ECT sensor.
•
An open circuit in the Light green/red
wire between the LED drive unit and
ECM.
Faulty LED drive unit
Faulty ECM.
- Inspect the ECT sensor (page 19-17).
- GO TO STEP 2.
- Short circuit of Light green/red wire
between the LED drive unit and ECM.
•
•
- An open circuit of White wire
between the ECM and ECT sensor.
Faulty ECM.
- Inspect the ECT sensor (page 19-17).
COOLANT TEMPERATURE INDICATOR