Logged my standard uk 02 wrx wagon today and found the following OBDII trouble codes have appeared:

P1592 Neutral Position Switch Circuit Malfunction for MT

Not sure what this is and what it is caused by.

P1511 ISC Solenoid Valve Signal #1 Circuit Malfunction (High Input)
P1513 ISC Solenoid Valve Signal #2 Circuit Malfunction (High Input)
P1515 ISC Solenoid Valve Signal #3 Circuit Malfunction (High Input)
P1517 ISC Solenoid Valve Signal #4 Circuit Malfunction (High Input)


I know this is the Idle Speed Control solenoid valve which is situated above the inlet manifold.

Can anyone tell me what the High Input is and possible causes. Do I need to replace it or is something else wrong causing the High Input?


Car is running fine but hope someone can shed some light on the above!

 

have you tried resetting the ecu first and see if the codes come back?

check all the plugs are connected securely and engine earths are clean and tight.

failing that you will need to change the idle valve and neutral sensor on the gearbox if they still come back

 

Reset the ECU this afternoon and will check the codes Tuesday. All earth points are sound and plugs secure.

Thanks for the reply.

 

ECU reset and everything has been fine. No more trouble codes at present.