Honda GL1800 Service Manual page 151

FUEL SYSTEM (Programmed Fuel Injection)
2. TP Sensor Input Voltage Inspection
Measure the voltage between the main wire har-
ness side 8P gray connector terminals.
Connection: Yellow/red (+) – Green/red (–)
Standard: 4.75 – 5.25 V
Is the voltage within 4.75 – 5.25 V?
NO
YES
3. TP Sensor Line Short Circuit Inspection
Turn the ignition switch to "OFF."
Disconnect the ECM 22P gray connector.
Check for continuity between Light green wire
terminal of the main wire harness side 8P gray
connector and ground.
Is there continuity?
YES
NO
4. TP Sensor Line Continuity Inspection
Check for continuity between Light green wire
terminals of the 8P gray connector and ECM 22P
connector.
Is there continuity?
NO
YES
5. TP Sensor Harness Continuity Inspection
Turn the ignition switch to "OFF."
Remove the air cleaner housing (page 5-57).
Disconnect the TP sensor 3P connector.
Check the connector for loose contacts or cor-
roded terminals.
Check for continuity of the following wires
between the 8P connector and TP sensor 3P
connector.
• Yellow/red
• Green/red
• Light green
Is there continuity?
NO
YES
5-20
– • Open circuit in the Green/red wire of
the main wire harness.
• Loose or poorly connected ECM
black connector.
– GO TO STEP 3.
– Short circuit in the Light green wire of
the main wire harness.
– GO TO STEP 4.
– Open circuit in the Light green wire of
the main wire harness.
– GO TO STEP 5.
– Open circuit in the following wires of
the engine sub-wire harness:
– Yellow/red
– Green/red
– Light green
– GO TO STEP 6.
CM 22P GRAY CONN CTOR
(viewed from the terminal side)
TP SENSOR CONNECTOR
Green/red
Light green
Yellow/red
ight green