Fuel Pump Relay System Inspection - Honda GL1800 Service Manual

FUEL SYSTEM (Programmed Fuel Injection)
FUEL PUMP RELAY
SYSTEM INSPECTION
• Perform the fuel pump inspection (page 5-54)
before this inspection.
Remove the seat (page 2-5).
Remove the two screws and remove the relay box.
Remove the relay blocks from the relay box.
1. Turn the ignition switch to "OFF" and exchange
Make sure the
the fuel pump relay with a known-good one.
engine stop switch
Turn the ignition switch to "ON" and check that
is turned to " ."
the fuel pump operates for a few seconds.
• If the fuel pump operates, replace the fuel
pump relay with a new one.
• If the pump does not operate, GO TO STEP 2.
2. Turn the ignition switch to "OFF" and remove
the fuel pump relay.
Turn the ignition switch to "ON."
Measure the voltage between the Black/yellow
wire terminal (+) of the relay connector and
ground (–).
There should be battery voltage.
• If there is no voltage, GO TO STEP 3.
• If there is battery voltage, GO TO STEP 4.
3. Turn the ignition switch to "OFF" and remove
the PGM-FI ignition relay.
Check for continuity between the Black/yellow
wire terminals of the fuel pump relay and PGM-FI
ignition relay connectors.
There should be continuity.
• If there is no continuity, repair the open circuit
in the Black/yellow wire.
• If there is continuity, check the PGM-FI igni-
tion relay circuits (page 18-11).
5-66
ELAY BOX
UEL PUMP RELAY
PGM- I IGNITION RELAY
FUEL PUMP RELAY
CONNECTOR
lack/yellow
lack/yellow
PGM- I IGNITION
RELAY CONNECTOR
UEL PUMP RELAY
CONNECTOR