Possible causes – Faulty Vehicle Speed Sensor– Vehicle Speed Sensor harness is open or shorted– Vehicle Speed Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1540 SUBARU Description The Vehicle Speed Sensor

Possible causes – Fuel Tank Pressure Control Solenoid harness is open or shorted– Fuel Tank Pressure Control Solenoid circuit poor electrical connection– Fualty Fuel Tank Pressure Control Solenoid Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Fuel tank pressure control solenoid harness is open or shorted– Fuel tank pressure control solenoid circuit poor electrical connection– Faulty fuel tank pressure control solenoid Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Idle Air Control Solenoid valve harness is open or shorted – Idle Air Control Solenoid valve circuit poor electrical connection – faulty Idle Air Control Solenoid valve Symptoms – Engine Light ON (or Service Engine Soon Warning

Possible causes – Low fuel pressure– Engine misfire– Large vacuum leak– Blocked converter– Faulty O2 sensor bank 2 Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Low fuel pressure– Misfire condition– Large vacuum leak– Air leak near sensor– Plugged catalytic converter– Lean air/fuel ratio– Faulty front O2 sensor Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P2096 SUBARU Description The

Possible causes – Open or short circuit condition betwen Transmission Control Module (TCM) and Engine Control Module (ECM).– Poor electrical connection at the TCM or ECM connector.– Faulty TCM Tech notes This problem is usually and electrical problem, open or

Possible causes – Open or short circuit condition betwen Transmission Control Module (TCM) and Engine Control Module (ECM).– Poor electrical connection at the TCM or ECM connector.– Faulty TCM Tech notes This problem is usually and electrical problem, open or

Possible causes – Open or short circuit condition– Poor electrical connection– Failed ISC Solenoid

Possible causes – Short in Air Pump circuit– Air pump assembly– Faulty Pressure Sensor– Pressure Sensor harness is open or shorted– Pressure Sensor circuit poor electrical connection When is the code detected? If the pressure level from the sensor has

Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

SUBARU Technical Service Bulletins for P1591 code 2002 SUBARU WRX ELECTRICAL SYSTEM:IGNITION:MODULE

P1703 SUBARU – Low clutch timing control solenoid valve circuit malfunction

P1701 SUBARU – Cruise control set signal circuit malfunction for automatic transmission

P1699 SUBARU – Engine torque control cut signal circuit high input

P1700 SUBARU – Throttle position sensor circuit malfunction for automatic transmission

P1698 SUBARU – Engine torque control cut signal circuit low input

P1590 SUBARU – Neutral position switch circuit high input