hi there... i've just installed my Pfc when i start car the heat light stays on and my air temp voltage is 4.99 and is highlighted black... is this normal?

have searched but couldnt find anything helpful

 

Please explain the "heat light" in more detail. Do you mean exhaust temp over heat? If so mine is broken and I can't help.

Now on the othe other issue. THe air temp sensor reading 4.99v means that the circuit is open (no connection from the air temp sensor to the ECU). So double check that the air temp sensor is plugged in and you have a connection back to the ECU. Ohm through it (getr an DMM/ohm meter and check for continuity). If you do then I would say your air temp sensor is shot.

The FSM is online somewhere. You'll need that to detemine which wire the air temp sensor is at the ECU side.

Good Luck,
Joe

 

The one car I've worked on with a failed IAT sensor read -30something degC, check it out, if this is the case the car will be pig rich and not run worth a crap. I don't recall the corresponding voltage.

 

after taking wiring out it stayed at the voltage of 4.99 which would suggest fault.....

Pig rich aint wrong single figure mpg... lol i thought it was my driving style

thanks guys for your help