Check Engine Light Pfc

[SargeRX8]

I was just driving home and my check engine light came on. It came on first solid for a few seconds then went away. Few seconds later it came on again, solid then went away. I went to stop the car and the idle was hunting really bad. I tapped the throttle and it stabilized. Then it came back again. Each time I was low in RPM, low speed(probably 2nd or 3rd gear max). Car has a Power FC. Hand controller showed 5 knock(the light was solid, not flashing), injector duty was low and temp was about 74c when I shut it off.

Any ideas what can trigger the light? I guess the only hint is the hunting idle, which it has never done before... Only thing that has changed since this happened were the rear brake pads... Where the hell do I start? The car is low on fuel atm, but no warning light for fuel and I wasn't giving it any. Any way to diagnose if its the TPS or AFM? What else throws up the warning light which could cause the engine to hunt?

The only thing I can think of is throw the standard ECU in there and do the diagnostic, but Ive got a Z32 AFM and Nismo injectors. I can swap out the AFM but I can't swap out the injectors... Will it throw error codes about the injectors?

Edited February 25, 2012 by SargeRX8

[mad082]

there are a few things that can cause the CEL. the amount of time the light stays on is linked to the cause. detonation is short flashes, injectors maxing out is a touch longer, etc.

[SargeRX8]

This is solid for about, well I can't time it it just stays on solid for at least 5 seconds.. Flashing CEL means something is maxed, solid means sensor failure. I just tested my tps, it seems solid, I can increment it .01v at a time to 4.06v.

[SargeRX8]

Cool, it won't do it anymore. f**kING SHIT f**kING PIECE OF SHIT.

I was reading on the net the way you diagnose with a power FC is go to the sensor page, anything which triggers the CEL is on that page and either you look for something out of the ordinary or you look for something which is highlighted black which means its at fault, not connected or not working.

I wish there was a list of EVERYTHING that triggers the light to come on solid, then I can check them out one at a time and tick them off.

[JonnoHR31]

take a photo of the sensor screen on the pfc whilst its running shit if possible and post it up

[SargeRX8]

take a photo of the sensor screen on the pfc whilst its running shit if possible and post it up

I took a photo of it normal, now I'm waiting for that engine light to come on so I can snap a photo of it in that state. Judging from what I have read, if the check engine light comes on, the issue WILL be displayed on the sensor screen on the commander(or at least values which are out of the ordinary).

Edited February 26, 2012 by SargeRX8