Thread: BCU, ECU & TCU for 4.6 from USA

Something like this [ame]https://www.youtube.com/watch?v=NGQ_I46lZBk[/ame] , i know exactly how to do it on a Td5 but V8 is different and i've never touched one... if no joy hook a very thin wire to the ECU's pin and plug the connector over it

or maybe this [ame]https://www.youtube.com/watch?v=fGWnH2I_DpA[/ame]

Thanks Sierrafery, really appreciating your help.

Ok, I've the a wire into pin 16 and connected to 86. I've got a ignition live wire into 85 and nothing on the other pins.

Went to start and it started then died. Quickly realised I hadn't synced the BCU to the 4.6 BCU (I put both the old BCU in and the old 4 ECU.

You wired it well, sync things then we'll see if it helped, normally it should not have any negative effect, eventually no effect in the worst case... PROVIDED the diagram in RAVE is good cos i'm based only on that and i've seen cases when it was wrong, fingers crossed

Originally Posted by Battler

The only issue is it runs open loop constantly and the fuel consumption is around 10mpg around town. I normally get around 13mpg.

It might be because I have only pre cat O2s and not the 4?

I made some investigation on this:

Originally Posted by 18-2-44 DESCRIPTION AND OPERATION

Open loop fuelling
Open loop fuelling does not rely on information from the HO2 S, but the air/ fuel ratio is set directly by the ECM, which
uses information gained from the ECT, MAF/ IAT, the TP sensors and also the vehicle speed sensor (VSS). The ECM
uses open loop fuelling under the following conditions:
l Cold start.
l Hot start.
l Wide open throttle.
l Acceleration.
The ECM uses open loop fuelling to control fuel quantity in all non adaptive strategy conditions. The ECM implements
fuelling information carried in the form of specific mapped data contained within its memory.
Because there is no sensor information (e.g. HO2 S), provided back to the ECM, the process is called an 'open loop'.
The ECM will also go into open loop fuelling if a HO2 S fails.

it's possible that it went to that open loop default cos for the ECU the SAI was unfunctional as it got open load on that relay's coil which was missing... though it might expect some different MAF readings when it activates the SAI and as the pump is missing the air flow will be the same and you'll get some air flow fault code this way, i'm just guessing....we'll see

And the results are in:

While the engine was running I tested the pins on the relay and they both had power.

Engine still running in open loop. I think I may have found the issue though; lefthand O2 has no volts according to Nanocom.

Still have the following codes:
P1000 - Maybe O2 sensor related
P0462 - I don't have a standard petrol tank and the pump is modified
P0483 - Cooling Fan Rationality Check Malfunction (?)
P0451 - Tank again
P0412 - SAI
P0418 - SAI
P0444 - SAI
P1592 - Rough Road

None of them activate the MIL lamp. Although I would have thought the last one would. It might be because I'm still using the old ABS ECU. I'll swap it out later with the one that matches the BCU and ECU from the USA.

So, I'll have a look at the O2 sensor and see if I can see a lose wire or if the connector is full of crap. Failing that I've got a spare O2 I can put in. If that fixes the open issue I'll be happy and not worry about the other codes.

Thanks again for your help Sierrafery

Welcome anytime, i'm sorry the trick didnt work though i dunno how that SAI should kick in cos if it kicks in only under load it's normal to have power on both pins cos when the ECU wants to activate the pump it switches earth to the coil, did you test drive it or just started the engine at idle.... erase all codes and go for a hard drive see what you get then, that rough road code is usually irrelevant.

Its funny but i cannot recall anyone on Aulro conplaining of MIL on, but plenty on Discoweb.

Cheers