2002-2004 Models

When the vehicle has one of these symptoms, check the diagnostic trouble code (DTC) with a scan tool. If there is no DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.

SYMPTOM TROUBLESHOOTING

Symptom	Diagnostic procedure	Also check for
Engine will not start (MIL works OK, no DTCs set)	Test the battery (see BATTERY TEST ). Test the starter (see STARTER PERFORMANCE TEST ). Troubleshoot the fuel pump circuit (see FUEL PUMP CIRCUIT TROUBLESHOOTING ).	Low compression No ignition spark Intake air leaks Locked up engine Broken cam chain Contaminated fuel
Engine will not start (MIL comes on and stays on, or never comes on at all, no DTCs set)	Troubleshoot the MIL circuit (see MIL CIRCUIT TROUBLESHOOTING ).
Engine will not start (immobilizer indicator stays on or flashes)	Troubleshoot the immobilizer system (see TROUBLESHOOTING ).
Engine is hard to start (MIL works OK, no DTCs set)	Test the battery (see BATTERY TEST ). Check the fuel pressure (see FUEL PRESSURE TEST ).	Low compression Intake air leaks Contaminated fuel
Cold fast idle too low (MIL works OK, no DTCs set)	Check the idle speed (see IDLE SPEED INSPECTION ).
Cold fast idle too high (MIL works OK, no DTCs set)	Check the idle speed (see IDLE SPEED INSPECTION ). Inspect/adjust the throttle cable (see THROTTLE CABLE ADJUSTMENT ). Inspect and test the throttle body (see THROTTLE BODY TEST ).
Idle speed fluctuates (MIL works OK, no DTCs set)	Check the idle speed (see IDLE SPEED INSPECTION ). Inspect/adjust the throttle cable (see THROTTLE CABLE ADJUSTMENT ). Inspect and test the throttle body (see THROTTLE BODY TEST ).	Intake air leaks
After warming up, idle speed is below specification without load (MIL works OK, no DTCs set)	Troubleshoot the A/C signal circuit (see A/C SIGNAL CIRCUIT TROUBLESHOOTING ). Troubleshoot the alternator FR signal circuit (see ALTERNATOR FR SIGNAL CIRCUIT TROUBLESHOOTING ). Inspect and test the throttle body (see THROTTLE BODY TEST ).	Vacuum hose clogged/cracked/poor connection
After warming up, idle speed is above specification without load (MIL works OK, no DTCs set)	Troubleshoot the A/C signal circuit (see A/C SIGNAL CIRCUIT TROUBLESHOOTING ). Troubleshoot the alternator FR signal circuit (see ALTERNATOR FR SIGNAL CIRCUIT TROUBLESHOOTING ). Inspect and test the throttle body (see THROTTLE BODY TEST ).	Intake air leaks
Low power (MIL works OK, no DTCs set)	Check the fuel pressure (see FUEL PRESSURE TEST ). Inspect and test the throttle body (see THROTTLE BODY TEST ). Inspect/adjust the throttle cable (see THROTTLE CABLE ADJUSTMENT ).	Low compression Camshaft timing Engine oil level
Engine stalls (MIL works OK, no DTCs set)	Check the fuel pressure (see FUEL PRESSURE TEST ). Check the idle speed (see IDLE SPEED INSPECTION ). Troubleshoot the brake pedal position switch signal circuit (see BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING ).	Intake air leaks Faulty harness and sensor connections
Difficult to refuel (MIL works OK, no DTCs set)	Test the fuel tank vapor control valve (see FUEL TANK VAPOR CONTROL VALVE TEST ). Inspect the fuel tank vapor control signal tube between the fuel pipe and the fuel tank vapor control valve. Inspect the fuel tank vapor vent tube between the EVAP canister and the fuel tank vapor control valve. Check the EVAP canister.	Malfunctioning gas station filling nozzle.
Fuel overflows during refueling (No DTCs set)	Replace the fuel tank vapor control valve (see FUEL TANK VAPOR CONTROL VALVE REPLACEMENT ).	Malfunctioning gas station filling nozzle.