Honda Metropolitan CHF50 Service Manual page 297

LIGHTS/METERS/SWITCHES
SYSTEM INSPECTION
1. Fuel Pump Operation Check
Remove the lower cover (page 2-10).
Turn the ignition switch to ON, check for an
operating sound from the fuel pump.
Is the operating sound heard?
NO - GO TO STEP 2.
YES - Inspect the discharge volume (page 18-
18).
2PCONNECTOR
2. Fuel Pump Battery Voltage Inspection
Disconnect the fuel pump 2P (Black) connector.
Check for battery voltage between the Red/black
wire terminal (+) of the wire harness side and
ground (-).
There should be battery voltage with the ignition
switch turned to ON and the engine stop switch
turned to " Q " .
Is there battery voltage?
NO - • Open circuit in Red/black wire
between the fuel pump and main
relay.
• Inspect the main relay (page 15-11).
YES - GO TO STEP 3.
3. Fuel Pump Circuit Inspection
Check for an open or short circuit in the White/
yellow wire between the fuel pump and ECM.
te there an open or short circuit?
NO - GO TO STEP 4.
YES - Open or short circuit in wire harness.
4. Fuel Pump Inspection
Check the resistance between the fuel pump ter-
minals.
STANDARD: 2.6 - 3.2 Q. (20°C/68°F)
Is the resistance within the standard?
NO - Faulty fuel pump.
YES - Faulty ECM.
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2P CONNECTOR (RED/BLACK TERMINAL)
2P CONNECTOR
18-17