Apexi Fc EXTM sensor

[Skaith4224]

Had this issue since getting the car but now it's getting in the way of troubleshooting. 

Basically, alway had the exhaust temp light on and the CEL on. Thought the CEL was due to the EXTM sensor showing as faulty. See pic. 

However, the other day I noticed while driving the CEL was off! Exhaust Temp still on though. Drove about 20 miles, no issues, then after a mid pull on boost, the CEL turned back on

But it's a start and surely means the temp sensor isn't the full cause of the CEL. 

Mainly, I need to find out how to stop the sensor from showing as faulty. (no cat so would guess, no sensor...) is there a way to check if its cable is still there and grounding? Not sure where it is.

 

Reading apexi forums, people say the temp light is a replacement for the CEL and to look for the faulty sensor. So I go round in circles.

 

Its a 1995 (I think spec 2) R33 gtst RB25DET 

 

Thanks for any assistance. 

 

Alan. 

[Duncan]

A PowerFC is pretty OG, I've forgotten pretty much everything about it.

When you say the lights are on, you mean always on, not flashing, right?

I have a manual for FC Edit which only talks about flashing lights:

And yes you are right, if the exhaust temp sensor plug is disconnected it will never cause a problem. It is possible in your case the wires were cut and it is earthing out somehow. Either way you can ignore that,

[Duncan]

actually, far more useful.

A long long time ago in a forum very near there was a Power FC FAQ thread. 

I don't know if the PDF is still in that thread but I kept a copy here: https://www.hgeconsulting.com.au/Apexi_PowerFC_FAQ.pdf

[Duncan]

The install section of that doc states the check engine light will stay on if any sensor value is highlighted, and your cat temp sensor is. You need to find that wiring and identify how it was removed, it might have just been cut and left loose.

[Skaith4224]

Thanks all for the reply's, for some reason i've not received any notifications about them hence my late response.

 

Will hopefully get some time today to look for the cable/sensor. I've read that it goes under the pasenger seat so might not have to jack her up and get all grubby

[Skaith4224]

Quick update. Found the sensor plugged into the De-Cat pipe and eventually managed to snip it.

Did have to pull the cable back into the car from under the seat so I could snip it again as it was grounding on the braid but I've finally been able to start the car with no warning lights showing

I was assuming as there was no cat the sensor would have been removed however I was wrong!

To answer a previous question, the lighs were solid on. It confused me as the CEL went out for a time while the EXTM was still on.

 

Thanks all,