Symptom Troubleshooting - Honda SXS700M4 Service Manual

PGM·FI SYSTEM
SYMPTOM TROUBLESHOOTING
When the vehicle has one of these symptoms, check the OTe or MIL blinking, refer to the DTe index (page 4-9) and begin Ihe
appropriate troubleshooting procedure. If there are no OTC stored in the PCM memory. do the diagnostic procedure for the
symptom, in the sequence listed below, until you find the cause.
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Engine cranks but won't start 1. Inspect Ihe ignition system No fuel to fuel injector
(No DTe and MIL blinking) (page 5-5). - Clogged fuel filter
2. Inspect the fuel supply system - Pinched or clogged fuel feed hose
(page
7-5). -
Pinched or clogged fuel tank breather hose
- Faulty fuel pump
- Faulty fuel pump circuits
Intake air leak
Faulty fuel injector
Engine cranks but won't start
(No fuel pump operation
sound when turning the
ignition switch to ON (I))
1
Contaminated/deteriorated fuel
IACV stuck closed
1. PCM
powerlgro C u ~ n~d ~ ci~ 'C ~ UC.it~S----+----'; O~p~e~n~c~i'~C~ui~t 2in~t~h~e~p~o~w~ecr
input (Redlwhite) and/
malfunction (page
4-28).
or ground (Green) wire of the PCM
2.
Inspect the fuel pump system Faulty main relay or related circuit
(page 7-9) . Faulty ignition switch or related circuit
Blown FI fuse (10 A)
."'~~'- __ C-.-""~~~~~~o-
________
+-c-~B~ro~wn IGNfuse~(1~5~A~)~
________________ _
Engine stalls, hard to start, 1. Check the idle speed Restricted fuel feed hose
rough idling (page 4-29). Contaminated/deteriorated fuel
Backfiring or misfiring during
acceleration
Poor performance
(driveability) and poor fuel
economy
2. Check the IACV (page
7-23).
Intake air leak
3. Inspect the fuel supply system Restricted fuel tank breather hose
(page 7~-~5L).~ __ ~ __________ -r--=-~F~a~u~lt~y~ig~n~it~io~n", s ystem
Check the ignition system. Faulty ignition system
1. Inspect the fuel supply system
(page 7-5).
2. Check the air cleaner fOf
Pinched or clogged fuel feed hose
Faulty fuel injector
Faulty ignition system
I-======~
______ I-.--'c:;; r o:og"g'i'ing (page 3-5).
Idle speed is below 1. Check the idle speed IACV stuck closed
specifications or fast idle too (page
4-29).
Faulty fuel supply system
low (No oTC and MIL
2.
Check the IACV (page
7-23).
Faulty ignition system
blinking) ____
-I __
'--V~alve
clearance
Idle speed is above 1. Check the idle speed IACV stuck opened
specifications or fast idle too (page
4-29)
Faulty ignition system
high (No oTC and MIL
2.
Check the accelerator pedal Intake air leak
blinking) operation and pedal freeplay Engine top end problem
(page 3-4) Clogged air cleaner
.=----e.3 ~ ._": Check the IACV (page 7-23L).
____
I-'--; v~ar~'~e~c~re~a~'a~n~c~e'.__---------------------
Mil slays on but no oTCs Troubleshoot the MIL circuit Faulty MIL circuit
set, or Mil never comes ON (page 4-25).
at all
MIL stays on at all times
(No oTC set)
Check the oLC circuit (Brown/red
wire) for short circuit.
• Short circuit in the oLC related wire
4-3