5. |
Emission control
system |
TROUBLESHOOTING GUIDE CHART


The number herein means the check
order. |
MFI TROUBLESHOOTING PROCEDURES
PROBLEM

Scan tool communication with PCM is not
possible
Comment
|
Probable cause
|
One of the
following causes may be suspected
•
|
Defective ground circuit of
PCM |
•
|
Improper communication line between PCM
and scan tool | |
•
|
Malfunction of PCM power supply
circuit. |
•
|
Malfunction of the
PCM. |
•
|
Open circuit between PCM and
DLC. | |
Engine will not start

Difficult to start (Engine Cranks)


ROUGH IDLE OR ENGINE STALLS


Engine hesitates or accelerates poorly


TROUBLESHOOTING
Trouble symptom
|
Probable cause
|
Remedy
|
Engine
will not crank
|
Battery charge
low
|
Charge or
replace battery
|
Battery cables
loose, corroded or worn
|
Repair or
replace cables
|
Transaxle
range switch faulty (Vehicle with
automatic transaxle only)
|
Adjust or replace
switch
|
Fusible link
blown
|
Replace
fusible link
|
Starter motor
faulty
|
Repair starter
motor
|
Ignition
switch faulty
|
Replace
ignition switch
|
Engine
cranks slowly
|
Battery charge
low
|
Charge or
replace battery
|
Battery cables
loose, corroded or worn
|
Repair or
replace cables
|
Starter motor
faulty
|
Repair starter
motor
|
Starter
keeps running
|
Starter motor
faulty
|
Repair starter
motor
|
Ignition
switch faulty
|
Replace
ignition switch
|
Starter
spins but engine will not crank
|
Pinion gear
teeth broken or starter motor faulty
|
Repair starter
motor
|
Ring gear teeth
broken
|
Replace
flywheel ring gear or torque
converter
|
FUEL TANK AND FUEL LINE
Trouble symptom
|
Probable cause
|
Remedy
|
Engine
malfunctions due to insufficient fuel supply
|
Bent or kinked
fuel pipe or hose
|
Repair or
replace
|
Clogged fuel
pipe or hose
|
Clean or
replace
|
Clogged fuel
filter of in-tank fuel filter
|
Replace
|
Water in fuel
filter
|
Replace the
fuel filter or clean the fuel tank and fuel lines
|
Dirty or
rusted fuel tank interior
|
Clean or
replace
|
Malfunctioning
fuel pump (clogged filter in the
pump)
|
Replace
|
Evaporative emission system malfunction (when fuel filler
cap is removed,pressure is released)
|
Incorrect
routing of a vapor line
|
Correct
|
Disconnected
vapor line
|
Correct
|
Folded, bent,
cracked or clogged vapor line
|
Replace
|
Faulty fuel
tank cap
|
Replace
|
Malfunctioning
overfill limiter (two-way
valve)
|
Replace
|