PGM-FI SYSTEM
PGM-FI SYMPTOM TROU COTING R '13
MO
When the scooter has one of these symptoms, check the MIL blinking, refer to the OTC index (page 4-16) and begin the
appropriate troubleshooting procedure. If there are
no
MIL blinking stored in the ECM memory, do the diagnostic procedure for the
symptom,
in
sequence listed below, until you find cause.
Symptom Diagnosis procedure
Also check for
Engine does not crank
1.
ECM power/ground circuits
.
Open circuit
in
the power input and/or ground
(No fuel pump operation malfunction (page 4-49). wire
of
the ECM
sound when turning ignition
2.
Sensor unit power/ground circuits
.
Blown MAIN fuse
(25
A)
switch ON) malfunction (page 4-49).
Engine cranks but won't start
1.
Crank the engine for more than
.
No fuel to injector
(No MIL blinking)
ten seconds and check the MIL - Clogged fuel filter
(page 4-13) and execute the - Clogged fuel tank cap breather hole
troubleshooting according to the
- Pinched or clogged fuel feed hose
MIL. - Faulty fuel pump
2.
Inspect the fuel supply system - Faulty fuel pump circuits
(page 7-6)
.
Intake air leak
.
Contaminated/deteriorated fuel
.
Faulty fuel injector
.
IACV stuck
.
Faulty ignition system
Engine stalls, hard
to
start,
1.
Check the idle speed (page 3-13).
.
Restricted fuel feed hose
rough idling
2.
Check the IACV (page 7-22).
.
Contaminated/deteriorated fuel
3.
Inspect the fuel supply system
.
Intake air leak
(page 7-6).
.
Restricted fuel tank cap breather
.
Faulty ignition system
Backfiring or misfiring during Check the ignition system (page 5-6).
acceleration
Poor performance Inspect the fuel supply system (page
.
Air cleaner element contaminated
(driveability) and poor fuel 7-6).
-
.
Pinched
or
clogged fuel feed hose
economy
.
Faulty pressure regulator (fuel pump)
.
Faulty injector
.
Faulty ignition system
Poor performance, lack offuel, Fuel supply test (page 7-9).
or engine start failure with
sufficient fuel stored
in
tank
Idle speed
is
below
1.
Check the idle speed (page 3-13).
.
Faulty fuel supply system
specifications (No MIL
2.
Check the IACV (page 7-22).
.
Faulty ignition system
blinking)
Idle speed
is
above
1.
Check the idle speed (page 3-13).
.
Faulty ignition system
specifications (No MIL
2.
Check the throttle operation and
.
Intake air leak
blinking) freeplay (page 3-6).
.
Engine top-end problem
3.
Check the IACV (page 7-22).
.
Air cleaner condition
MIL stays
ON
or MIL never
Inspect the MIL circuit (page 4-48).
comes ON at all (Engine
operates normally)
MIL stays
ON
Inspect the
OLC
circuit (page 4-48).
(Engine operates normally
and
No
OTC set)
4-8
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