Honda GL1800 Service Manual page 160

2. No. 3 Injector Resistance Inspection
Turn the ignition switch to "OFF."
Disconnect the No. 3 injector 2P connector.
Measure the resistance between the No. 3
injector terminals.
Standard: 11.1 – 12.3Ω (at 20° C/68° F)
Is resistance within 11.1 – 12.3Ω (at 20° C/68° F)?
NO – Faulty No. 3 injector.
YES – GO TO STEP 3.
3. No. 3 Injector Short Circuit Inspection
Check for continuity between the No. 3 injector
terminal and ground.
Is there continuity?
YES – Faulty No. 3 injector.
NO – GO TO STEP 4.
4. No. 3 Injector Power Input Line Inspection
Turn the ignition switch to "ON."
Measure the voltage between the wire harness
side connector terminal of the No. 3 injector and
ground.
Connection: Brown (+) – Ground (–)
Standard: Battery voltage
Does battery voltage exist?
NO – Open circuit in the Brown wire.
YES – GO TO STEP 5.
5. No. 3 Injector Control Line Short Circuit
Inspection
Turn the ignition switch to "OFF."
Disconnect the ECM 6P black connector.
Check for continuity between the Red/black wire
terminal of the wire harness side 6P connector
and ground.
Is there continuity?
YES – Short circuit in the Red/black wire.
NO – GO TO STEP 6.
6. No. 3 Injector Control Line Continuity Inspection
Check for continuity between the Red/black wire
terminals of the No. 3 injector 2P connector and
ECM 6P black connector.
Is there continuity?
NO – Open circuit in the Red/black wire.
YES – Replace the ECM with a new one and
inspect again.
FUEL SYSTEM (Programmed Fuel Injection)
NJECTOR TERM NALS
CM 6P BLACK CONN CTOR
(viewed from the terminal side)
Red/black
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