Page 116 - 2019 SHOP MANUAL CRF1000/A/D

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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/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 1. Check the spark plug condition (page 3-5). • Contaminated/deteriorated fuel
(No DTC and MIL blinking) 2. Inspect the ignition system (page 5-6). • No fuel to fuel injector
3. Check the cylinder compression (page 10- – Clogged fuel filter
4). – Pinched or clogged fuel tank
4. Check the fuel pump (page 7-7). breather hose
5. Check the IACV (page 7-16). – Pinched or clogged fuel feed
hose
• Faulty fuel injector
• Intake air leak
Engine cranks but won’t start 1. ECM/PCM power/ground circuits • Faulty bank angle sensor or
(No fuel pump operation sound malfunction (page 4-40). related circuit
when turning the ignition ON) 2. Check the fuel pump (page 7-7). • Faulty FI relay or related circuit
• Faulty engine stop switch or
related circuit
Engine stalls, hard to start, 1. Check the idle speed (page 3-14). • Contaminated/deteriorated fuel
rough idling 2. Check the IACV (page 7-16). • Intake air leak
3. Inspect the fuel supply system (page 7-4). • Pinched or clogged fuel tank
4. Inspect the battery charging system (page breather hose
21-7). • Faulty ignition system
5. Inspect the ignition system (page 5-6).
Afterburn when engine braking 1. Inspect the secondary air supply system
is used (page 3-15).
2. Inspect the ignition system (page 5-6).
Backfiring or misfiring during Inspect the ignition system (page 5-6).
acceleration
Poor performance (driveability) 1. Inspect the fuel supply system (page 7-4). • Faulty pressure regulator (fuel
and poor fuel economy 2. Inspect the air cleaner element (page 3-4). pump)
3. Inspect the ignition system (page 5-6). • Faulty fuel injector
Idle speed is below 1. Inspect the fuel supply system (page 7-4).
specifications or fast idle too low 2. Check the idle speed (page 3-14).
(No DTC and MIL blinking) 3. Check the IACV (page 7-16).
4. Inspect the ignition system (page 5-6).
Idle speed is above 1. Check the idle speed (page 3-14). • Faulty ignition system
specifications or fast idle too 2. Check the throttle operation and freeplay • Intake air leak
high (No DTC and MIL blinking) (page 3-3). • Engine top-end problem
3. Check the IACV (page 7-16). • Air cleaner condition
MIL never comes on at all Inspect the combination meter (page 22-12).
MIL stays on but no DTCs set Inspect the MIL circuit (page 4-39).
• DLC circuit malfunction
• TXD line circuit malfunction

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