| 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