Ignition System - Honda CBR650F Service Manual

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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 4-9) and begin the
appropriate troubleshooting procedure. If there are no DTC stored in the ECM 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 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 or MIL never
comes on at all
4-8
Diagnosis procedure
1. Crank the engine for more than ten
seconds and check the MIL (page 4-6) and
execute the troubleshooting according to
the DTC.
2. Inspect the ignition system (page 5-3).
3. Inspect the fuel supply system (page 7-4).
4. Check the spark plug condition (page 3-6).
5. Check the cylinder compression (page 10-
4).
1. ECM power/ground circuits malfunction
(page 4-36).
2. Inspect the fuel pump system (page 7-8).
1. Check the idle speed (page 3-10).
2. Check the IACV (page 7-17).
3. Inspect the fuel supply system (page 7-4).
1. Inspect the secondary air supply system
(page 7-19).
2. Inspect the ignition system (page 5-3).
Inspect the ignition system (page 5-3).
Inspect the fuel supply system (page 7-4).
1. Check the idle speed (page 3-10).
2. Check the IACV (page 7-17).
1. Check the idle speed (page 3-10).
2. Check the throttle operation and freeplay
(page 3-4).
3. Check the IACV (page 7-17).
Inspect the MIL circuit (page 4-35).
Also check for
• No fuel to fuel injector
– Clogged fuel filter
– Pinched or clogged fuel tank
breather hose
– Pinched or clogged fuel feed
hose
– Faulty fuel pump
– Faulty fuel pump circuits
• Intake air leak
• Contaminated/deteriorated fuel
• Faulty fuel injector
• IACV stuck
• Open circuit in the power input
and/or ground line of the ECM
• Faulty main relay and related
circuit
• Faulty fuel pump relay and related
circuit
• Blown FI fuse (20 A)
• Restricted fuel feed hose
• Contaminated/deteriorated fuel
• Intake air leak
• Restricted fuel tank breather hose
• Faulty ignition system
• Air cleaner element contaminated
• Pinched or clogged fuel feed hose
• Faulty pressure regulator (fuel
pump)
• Faulty fuel injector
• Faulty ignition system
• Faulty fuel supply system
• Faulty ignition system
• Faulty ignition system
• Intake air leak
• Engine top-end problem
• Air cleaner condition