Pgm-Fi Symptom Troubleshooting - Honda NC700XA Service Manual

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PGM-FI SYMPTOM TROUBLESHOOTING

When the motorcycle has one of these symptoms, check the DTC or MIL blinking, refer to the DTC index (page 4-15) and begin the
appropriate troubleshooting procedure. If there are no DTC/MIL blinking stored in the ECM/PCM memory, do the diagnostic
procedure for the symptom, in sequence listed below, until you find cause.
Symptom
Engine cranks but won't start
(No DTC and MIL blinking)
Engine cranks but won't start
(No fuel pump operation sound
when the turning the ignition
ON)
Engine stalls, hard to start,
rough idling
Afterburn when engine braking
is used
Backfiring or misfiring during
acceleration
Poor performance (driveability)
and poor fuel economy
Idle speed is below
specifications or fast idle too low
(No DTC and MIL blinking)
Idle speed is above
specifications or fast idle too
high (No DTC and MIL blinking)
MIL stays ON but no DTCs set,
or MIL never comes ON at all
Diagnosis procedure
1. Inspect the spark plug condition (page 3-
8).
2. Inspect the ignition system (page 5-6).
3. Inspect the cylinder compression (page
10-5).
4. Inspect the IACV (page 7-22).
5. Inspect the fuel supply system (page 7-10).
1. ECM/PCM power/ground circuits
malfunction (page 4-68).
2. Inspect the fuel supply system (page 7-10).
1. Inspect the engine idle speed (page 3-15).
2. Inspect the IACV (page 7-22).
3. Inspect the fuel supply system (page 7-4).
4. Inspect the battery charging system (page
21-7).
5. Inspect the ignition system (page 5-6).
Inspect the ignition system (page 5-6).
Inspect the ignition system (page 5-6).
1. Inspect the fuel supply system (page 7-4).
2. Inspect the air cleaner element (page 3-7).
3. Inspect the ignition system (page 5-6).
1. Inspect the engine idle speed (page 3-15).
2. Inspect the IACV (page 7-22).
3. Inspect the ignition system (page 5-6).
1. Inspect the engine idle speed (page 3-15).
2. Inspect the throttle operation and freeplay
(page 3-5).
3. Inspect the IACV (page 7-22).
4. Inspect the ignition system (page 5-6).
Inspect the MIL circuit (page 4-63).
PGM-FI SYSTEM
Also check for
• No fuel to injector
– Clogged fuel filter
– Pinched or clogged fuel feed
hose
– Faulty fuel pump
– Faulty fuel pump circuits
• Intake air leak
• Contaminated/deteriorated fuel
• Faulty fuel injector
• Open circuit in the power input
and/or ground wire of the ECM/
PCM
• Blown main fuse (30 A)
• Blown sub fuse 15 A (FI)
• Blown sub fuse 7.5 A (ENG STOP)
• Restricted fuel feed hose
• Contaminated/deteriorated fuel
• Intake air leak
• Faulty MAP sensor
• Restricted fuel tank breather hose
• Faulty pressure regulator (fuel
pump)
• Faulty injector
• Faulty MAP sensor
• Intake air leak
• Engine top-end problem
• Air cleaner element condition
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