Honda NC700 2012, Service Manual

Page: 168 / 773

4-7
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PGM-FI SYSTEM
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 Diagnosis procedure Also check for
Engine cranks but won’t start
(No DTC and MIL blinking) 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).
• 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
Engine cranks but won’t start
(No fuel pump operation sound
when the turning the ignition
ON) 1. ECM/PCM power/ground circuits
malfunction (page 4-68).
2. Inspect the fuel supply system (page 7-10).
• 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)
Engine stalls, hard to start,
rough idling 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).
• Restricted fuel feed hose
• Contaminated/deteriorated fuel
• Intake air leak
• Faulty MAP sensor
• Restricted fuel tank breather hose
Afterburn when engine braking
is used Inspect the ignition system (page 5-6).
Backfiring or misfiring during
acceleration Inspect the ignition system (page 5-6).
Poor performance (driveability)
and poor fuel economy 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). • Faulty pressure regulator (fuel
pump)
• Faulty injector
• Faulty MAP sensor
Idle speed is below
specifications or fast idle too low
(No DTC and MIL blinking) 1. Inspect the engine idle speed (page 3-15).
2. Inspect the IACV (page 7-22).
3. Inspect the ignition system (page 5-6).
Idle speed is above
specifications or fast idle too
high (No DTC and MIL blinking) 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).
• Intake air leak
• Engine top-end problem
• Air cleaner element condition
MIL stays ON but no DTCs set,
or MIL never comes ON at all Inspect the MIL circuit (page 4-63).