Honda NSA700A DN-1 2009, Service Manual

Page: 130 / 654

FUEL SYSTEM (PGM-FI)
SYMPTOM TROUBLESHOOTING
When the m otorcycle has one o f these sym ptom s, check the DTC or MIL b linking, refer to the DTC index (page 6-14) and
begin the appropriate tro u b le s h o o tin g procedure. If there are no DTC/MIL b linking stored in the ECM m em ory, do the d ia g ­
nostic procedure fo r the sym p to m , in sequence listed below , u n til you fin d the cause.
Sym ptom Diagnosis procedure
A lso check fo r
Engine cranks but w o n 't
start
(No DTC and MIL blinking)
1. Crank the starter fo r m ore than
ten seconds and check the DTC
(page 6-12) and execute the
tro u b le sh o o tin g according to
the DTC.
2. Inspect the fuel su p p ly system
(page 6-37).
• No fuel to in je cto r
- Clogged fuel filte r
- Pinched or clogged fuel feed hose
- Pinched o r clogged fuel tank breather
hose
- Faulty fuel pum p
- Faulty fuel pum p circuits
• Intake air leak
• C ontam inated/deteriorated fuel
• Faulty fuel injector
• IACV stuck
• Faulty ig n itio n system
Engine cranks but w o n 't
start
(No fuel pump o peration
sound when tne tu rn in g the
ignition ON)
1. ECM pow er/grou nd circu its
m alfunction (page 6-69)
2. Inspect the fuel su p p ly system
(page 6-37)
• Open c ircu it in the p o w e r in p u t and/or
ground w ire o f the ECM
• Faulty bank angle sensor o r related circuit
• Faulty FI/IGN relay o r related c ircu it
• Faulty engine stop switch o r related circuit
• Blown STARTER/IGN fuse (10 A)
Engine stalls, hard to start,
rough idling
1. Check the idle speed.
2. Check the IACV.
3. Inspect the fuel s u p p ly system
(page 6-37)
• Restricted fuel feed hose
• C ontam inated/deteriorated fuel
• Intake a ir leak
• Faulty IACV
• Restricted fuel tank breather hose
• Faulty ig n itio n system
Afterburn when engine
braking is used
Check the PAIR system (page 6-71).
• Faulty pulse secondary a ir in je ctio n (PAIR)
system
- Faulty PAIR c o n tro l solenoid valve
- Faulty PAIR check valve
- Clogged hose o f the PAIR system
• Faulty ig n itio n system
Backfiring or m isfirin g d u r­
ing acceleration
Check the ig n itio n system . • Faulty ig n itio n system
Poor performance (drive-
ability) and poor fuel econ­
omy Inspect the fuel s u p p ly system
(page 6-37).
• Pinched o r clogged fuel feed hose
• Faulty pressure regulator
• Faulty injector
• Faulty ig n itio n system
MIL stays ON b ut no DTCs
set, or MIL never com es ON
at all
Troublesho ot the M IL c irc u it (page
6-36).
• Faulty M IL circu it
MIL stays ON at all
(No DTC set) Check the D LC circuit (B row n w ire)
fo r sh o rt circuit.
• Short c irc u it in the DLC related w ire