TIBURON(GK) >2004 > G 2.7 DOHC > Fuel System > General Information>Troubleshooting  
TROUBLESHOOTING
1.
Power supply
Battery
Fusible link
Fuse
2.
Body ground
3.
Fuel supply
Fuel line
Fuel filter
Fuel pump
4.
Ignition system
Spark plug
High-tension cable
Ignition coil
5.
Emission control system
PCV system
Vacuum leak
6.
Others
Ignition timing
Idle speed
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
No power supply to PCM
Defective ground circuit of PCM
Defective 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