Pgm-Fi Symptom Troubleshooting - Honda CRF1000 Shop Manual

dummyhead dummyhead
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/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 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 never comes on at all
MIL stays on but no DTCs set
4-8
Diagnosis procedure
1. Check the spark plug condition (page 3-5).
2. Inspect the ignition system (page 5-6).
3. Check the cylinder compression (page 10-
4).
4. Check the fuel pump (page 7-7).
5. Check the IACV (page 7-16).
1. ECM/PCM power/ground circuits
malfunction (page 4-40).
2. Check the fuel pump (page 7-7).
1. Check the idle speed (page 3-14).
2. Check the IACV (page 7-16).
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).
1. Inspect the secondary air supply system
(page 3-15).
2. 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 3-4).
3. Inspect the ignition system (page 5-6).
1. Inspect the fuel supply system (page 7-4).
2. Check the idle speed (page 3-14).
3. Check the IACV (page 7-16).
4. Inspect the ignition system (page 5-6).
1. Check the idle speed (page 3-14).
2. Check the throttle operation and freeplay
(page 3-3).
3. Check the IACV (page 7-16).
Inspect the combination meter (page 22-12).
Inspect the MIL circuit (page 4-39).
• DLC circuit malfunction
• TXD line circuit malfunction
Also check for
• Contaminated/deteriorated fuel
• No fuel to fuel injector
– Clogged fuel filter
– Pinched or clogged fuel tank
breather hose
– Pinched or clogged fuel feed
hose
• Faulty fuel injector
• Intake air leak
• Faulty bank angle sensor or
related circuit
• Faulty FI relay or related circuit
• Faulty engine stop switch or
related circuit
• Contaminated/deteriorated fuel
• Intake air leak
• Pinched or clogged fuel tank
breather hose
• Faulty ignition system
• Faulty pressure regulator (fuel
pump)
• Faulty fuel injector
• Faulty ignition system
• Intake air leak
• Engine top-end problem
• Air cleaner condition