Please help!

susanf73

I have a 2008 Ford Focus. It is running but I noticed the engine roaring when accelerating/decelerating so took it to a garage. They ran a diagnostic test and basically told me it would be a very expensive repair and not worth it. This is exactly what the sheet they gave me says - Power Train Control Module Monitor Fault/ Power Train Control Module Electronic Throttle Controller Adaption Stat Failure. I have a sentimental attachment to this car and I’m not ready to give up on it but I don’t have enough knowledge not to get ripped off. If anyone could give me any advice with regard cost I’d be very grateful. 

AdrianC

So what did the garage say when you said "That's OK, at least give me a rough estimate so I can make a decision"

What number would be your walk-away...? Bear in mind a 12yo Focus is probably a couple of grand's-worth at most.

EdGasketTheSecond

It could be as simple as cleaning a plug and connector. The trouble with diagnostics is they assume all the wiring is perfect. Connections oxidise over time and become corroded as well. If you know where the connectors are try taking apart and cleaning with switch cleaner (available from Halfords). Join a Focus Forum if you don't know what to clean and also to get advice about this problem.

Goudy

There could be a few reasons for this.

Power Train Control Module Monitor Fault is just telling you the engines ECU has logged fault.

Electronic Throttle Controller Adaption Stat Failure, this seems the fault that's been logged.

This sounds like a problem between the throttle body and throttle pedal.

These are fly by wire, so no cable between your right foot and the engine, they are electronically driven so have sensors on the pedal that records it's position and a motor on the throttle body to open and close it with another position sensors on the throttle body, if the two sensors don't match for any reason you get a fault.

The ECU will also monitor the power the throttle drive motor draws, if it doesn't match what it thinks should be right or the circuit is broken you get another fault.

I would normally be tempted to suggest you have a problem at the throttle body or throttle pedal sensor but some Fords have had problems with faults in the Power Train Control Modules (engine ECU) that cause these electronic accelerator control (EAC) problems, which might be why your garage is suggesting it's an expensive job as they'd often replace the pedal sensor and throttle body/throttle position sensor and not fix the problem before replacing the ECU as that's the only thing left to cause the problem.

There are companies out there that can repair the problem, just try searching "Ford EAC Fail"

angrycrow

Could be as simple as the throttle body needs a clean. A build up of muck in the tb can stop it fully closing which causes the system to throw an error at start up.
May not be the issue with yours but a very cheap solution to try first. Can of carb cleaner is under £5. Depends if you are up for a little DIY removal of the tb. It's one pipe to come off, one electrical connector to unplug and four bolts. Very easy if you have any aptitude for DIY.