Fuel System (Pgm-Fi) Symptom Troubleshooting - Honda 2010 CRF250R Service Manual

FU EL SYSTEM (PGM.FI)
PGM -FI SYMPTOM TROUBLESHOOTING
When the motorcycle has one of these symptoms, check Ihe
DI G
or MIL blinking, refer to Ihe
DIC
index (page 5-15) and begin the
appropriate troubleshooting procedure. If there are no DTG/MIL blinking stored in the ECM memory. do Ihe diagnostic procedure
for Ihe symptom, in sequence listed below, until you find the cause.
Symptom
Engine cranks but won't start
(No DTG and MIL blinking)
Engine cranks but won '! start
(No fuel pump operation
sound when the engine is
Engine stalls, hard to start,
rough idling
r
cranking)
Aflerburn 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 DIC and MIL blinking)
Idle speed is above
speCifications or fast idle too
high
(No DIC and MIL blinking)
MIL never comes ON at all
Mil stays ON
(No DIC set)
5-6
Diagnosis procedure
1. Crank the engine for more than 10
seconds and check the DTG (page
5-13) and execute the
troubleshooting according to the
DTC.
2. Inspect the fuel line (page 3-6).
3.
Inspect the ignition system (page
16-5).
1. ECM power/ground circuits
malfunction (page 5-58)
2.
Inspect the fuel supply system
(page
5-30).
1.
Inspect the idle speed .
2.
Inspect the fast idle knob.
3. Inspect the fuel line (page 3-6).
4.
Inspect the regula tor/rectifier
(page 16-11).
5. Inspect the condenser
(page 16-16).
6. Inspect the ignition system (page
16·5).
Inspect the ignition system
(page 16-5).
Also check for
No fue! to injector
- Clogged fuel strainer
- Restricted fuel hose
- Restricted fuel tank breather hose
- Faulty fuel pump
- Faulty fuel pump circuits
Intake air leak
Contaminated/deteriorated fuel
~ aulty
injector
Faulty engine stop switch or related circuit
Restricted fuel hose
Contaminated/deteriorated fuel
Intake air leak
Restricted fuel tank breather hose
Clogged fuel strainer
Inspect the ignition system
(page 16-5).
1.
jnsp~e~c~tt~h~e'fu~e~I";~O~e"(p~a~g~e~3'-6~)~ . ---t-:--'R~estricted
fuel hose
2.
Inspect the air cleaner element Restricted fuel tank breather hose
(page 3-8). Clogged fuel strainer
3.
Inspect the ignition system (page Faulty pressure regulator in the fuel pump
16-5). Faulty injector
1. Inspect the idle speed.
2.
Inspect the fuel line (page 3-6).
3.
Inspect the ignition system (page
16-5).
1.
Inspect the idle speed.
2.
Inspect the throttle operation and
freeplay
3.
Inspect the air cleaner element
(page 3-8).
4.
Inspect the fast idle knob
(page 5-54).
Faulty MAP sensor
Restricted MAP sensor hose
Restricted fuel hose
Restricted fuel tank breather hose
Restricted fas t idle knob circuit
Clogged fuel strainer
Intake air leak
Engine top end problem
Inspect the
Mil
ci",, ~ u~It~(~pa~g~e ~ 5~.~2~g~)._-t
_ _ _ _ __ _ _ _ _ _ _
1. Inspect the
OLe
circui t
(page
5-29).
2.
Inspectlhe MIL circuit
( age
5-29).