Thread: BCU, ECU & TCU for 4.6 from USA

To me it looks like that ECU is fubar'd cos it stores random fault codes, anyway if you re-read that part i quoted from RAVE about open loop according to these last fault codes it can be caused by the temp sensor malfunction not by the O2 sensor so work on that

strangely when you connected the relay to pin 4 you closed that SAI solenoid circuit but you got open circuit code for that and now with it empty you get nothing ...that's why the EU is suspect to me

How is this going Battler?

Cheers

Work in progress. Haven't being able to do anything lately due to work and getting rust removed (from me).

The main issue is a dead O2 sensor causing it to run open loop. Hopefully replacing the sensor will fix it.

Break a leg mate.

Cheers

It's a fail. Goes really well but running way way too rich.

Now I can't get the original ECU to work. Tried the learn code in the Nanocom and nothing. Tried leaving the key on; one dead D2. If I put the 4.6 ECU back in it starts and runs.

I'll give it another go tomorrow.

what fault codes do you get now?

I'm getting the following codes:

Pxxxx permanent voltage supply. Signal too low
P0462 fuel level input error. Signal too high
P0141
P0161

The first one is new; didn't get that yesterday. But yesterday I was getting a code i think was P1117 and something like saying Temp sensor no signal.

Runs really well except when returning to idle it nearly stalls, running open loop and is very rich.

Originally Posted by Battler

But yesterday I was getting a code i think was P1117 and something like saying Temp sensor no signal.

Runs really well except when returning to idle it nearly stalls, running open loop and is very rich.

means the ecu doesnt know the temperature of the air going in, and hence, doesnt know the mass of the air going on, and so doesn't know the correct amount of fuel to put in.