hi
my engine light came on today?car seems to be running fine still its a 95 wrx with mods running apexi ecu at 335bhp how do i get engine codes as i have plugged self diagnostic wires in but nothing im assuming its because ecu has been changed???
any help would be great

 

You have an Apexi ECU - so fault code finding doesn't apply.

If you have a OEM 4-plug ECU you could temp swap it over and run a check again... just to see if anything obvious flashes up.

When you say the CEL came on (obv with the Apexi), "how" did it show up i.e. solid, or flashing?

If flashing can you describe the pulsing? Was it very rapid? If so, then this means the programmed knock threshold warning was breached.

 

Ideally we need as much anecdotal evidence of the time the CEL came on (gear, load, etc.) as possible, to get a better picture of the situation...

 

light is on constant,the car was ticking over when light came on,not being driven.i have original ecu still

 

Out of interest what does a "slow" flashing CEL mean??

 

The Apexi CEL can be set up to indicate IDC, MAF and knock warnings (mapper sets voltage level trigger points to what he or customer desired).

The knock CEL is extremely rapid. The other two warnings are slower i.e. longer pauses/pulses. It says in the Commander user manual how the flashes specifically behave (I can't recall at the moment).

 

disconnected battery today to see if that would turn light off no!!! will swap ecu over tomorrow if get chance see if anything comes up??