Honda Metropolitan CHF50 Service Manual page 295

LIGHTS/METERS/SWITCHES
SYSTEM INSPECTION
1. Coolant Temperature Indicator Circuit
Inspection (1)
Remove the luggage box (page 2-6).
Warm up the engine.
Stop the engine and disconnect the ECT sensor
connector.
Short the terminals of connector with a suitable
jumper wire.
Start the engine and make sure the temperature
indicator lights after 10 seconds.
Does the indicator light?
NO - GO TO STEP 2.
YES - Inspect the ECT sensor (page 18-16).
2. Coolant Temperature
Inspection (2)
Indicator Circuit
Remove the front meter cover (page 2-12).
Ground the Light green/red wire terminal of the
3P connector with a jumper wire.
Turn the ignition switch to ON, check that the
indicator lights.
Does the indicator light?
NO - Faulty indicator (wire harness).
YES - • Open circuit of White wire between
the ECM and ECT sensor.
• Open circuit of Light green/red wire
between the speedometer and ECM.
• Faulty ECM.
When the indicator always lights during a operation
1. Coolant Temperature Indicator Circuit
Inspection (short circuit)
Turn the ignition switch to ON (engine not
started) and check that the indicator lights.
Does the indicator lights?
NO - GO TO STEP 2.
YES - Short circuit of Light green/red wire
between the speedometer and ECM.
2. Ect Sensor Circuit Inspection
Remove the luggage box (page 2-6).
Disconnect the ECT sensor connector.
Ground the White wire with a suitable jumper
wire.
Start the engine, check that the indicator lights.
Does the indicator light?
NO - Inspect the ECT sensor (page 18-16).
YES - • Short circuit of White wire between
the ECM and ECT sensor.
• Faulty ECM.
18-15