Just dug this out from some of my notes,

Problem: Loss of power and EAC FAIL displayed.

Solution: The EAC FAIL relates to the electronic accelerator control. Vehicles that trigger diagnostic fault codes (DTCs) / fault codes P2138 with P2122, P2123 or P2127 a common problem is the PCM (powertrain control module = ECM = engine control module) electrical connector. Check the electrical connector for the PCM for damage to the terminals and pins. Replace or repair as necessary. On vehicles that trigger P2119, P2135, P2176, P0120, P0122, P0123, P0220, P0222 or P0223 fault codes can suffer from the same PCM terminal damage but also suffer from throttle body electrical connector damage. The throttle body will need to be inspected and tested using an scope or scanner looking at live data. Check the serial number on the throttle body. Replace with a revised throttle body of the serial number is below 400000. Fault codes definition:

Pedal fault codes

P2120 – Pedal sensor 1 electrical error

P2122 – Pedal sensor 1 electrical error short to ground or open circuit

P2123 – Pedal sensor 1 electrical error short to battery

P2125 – Pedal sensor 2 electrical error

P2127 – Pedal sensor 2 electrical error short to ground or open circuit

P2128 – Pedal sensor 2 electrical error short to battery

P2138 – Pedal sensor 1 & 2 ratio error

Throtlle body fault codes

P0120 – Throttle position sensor 1 electrical error

P0122 – Throttle position sensor 1 electrical error short to ground

P0123 – Throttle position sensor 1 electrical error short to battery or line break

P0220 – Throttle position sensor 2 electrical error

P0222 – Throttle position sensor 2 electrical error short to ground or open circuit

P0223 – Throttle position sensor 2 electrical error short to battery

P2135 – Throttle position sensor ratio error

P2119 – Throttle plate convergence error. The throttle flap has not moved to the required position. This can be from an obstruction or incorrect signal. Check wiring and connectors.

P2176 - Throttle plate adaption error. After the ignition is switched off, the throttle body will run through an adaption cycle and spring check. This confirms correct functioning of the throttle body through the full range. If other fault codes are stored, they should be investigated first before P2176.

P2100 - H bridge error. Fault in circuit between throttle body motor and PCM.

PCM fault codes

P2107 - Processor monitoring on the main controller fault

P2108 - Analogue to digital converter. This can be a number of different sensors and will often be triggered with other fault codes that are more specific. P2108 can relate to mass air flow, engine speed, pedal ratio, TPS ratio, torque generation, engine speed limitation etc.

If there is inteferance or the voltage is not regulated correctly, the signal for pedals or throttle body will be out of range

P0641 – Sensor voltage supply circuit 1 noisy signal

P0642 – Sensor voltage supply circuit 1 short to ground or open circuit

P0643 – Sensor voltage supply circuit 1 short to battery

P0651 – Sensor voltage supply circuit 2 noisy signal

P0652 – Sensor voltage supply circuit 2 short to ground or open circuit

P0653 – Sensor voltage supply circuit 2 short to battery

THIS IS TO ALL WITH EAC FAIL ON THERE FIESTA.

I HAVE A FIESTA 02 1.4 ZETEC AND HAD EAC FAIL.

I CHANGED THROTTLE SENSOR SPEEDO SENSOR AND WAS RUNING BACK AND FORTH TO GARAGE TO PUT IT ON THERE COMPUTER.

IF ALL SENSERS ARE OK ITS A EASY CHEAP FIX.

GO GET YOUR SELF A £2 CAN OF ELECTRIC CLEANER AND GO UNDER YOUR BONNET AND PULL APART CONNECTION BOXES AND SPRAY PLENTY ON BOTH ENDS. I DID TWO AT A TIME AND THEN RAN CAR TO SEE IF IT WAS OK.I HAD TWO DIRTY CONNECTION BOXS. THE BIG ONE IN FRONT OF BATTERY AND ONE AT FRONT OF ENGINE IN LINE WITH WHERE ENGINE MEETS G BOX. NOW MY CAR IS SPOT ON. NO MORE LIMP MODE... LOL...............

Yes a very inexpensive fix to this god-damn EAC fail... after alot of b*****ing around for weeks on end trying to locate the problem .... i have come to the conclution to id say 75% of EAC related problems.. Alot of people have been taken for a ride with garages charging hundreads of pounds for expensive parts suce as, throttle-bodys, new sensors, new throttle assemblys e.t.c..this is just to note some of what i have read that people have had to buy recently And there is no need ...also a diagnostic will not show up the right code for this problem as its not throttle related and mechanics rely too much on stupid dignostic tools to always get right to the sorce of the problem which is a load of b******s.....but the problem come when this EAC comes back to haunt these poor ford owners,that are subsuqently getting ripped off.

Right the problem.(note this may not work in some cases) ... EAC fail shows up within the dash flashing EAC FAIL ...and car badly underpowers, You dont need to be a mechanic to fix this ... just folow these steps.

Firstly you need to locate the MAF ( mass air flow sensor) this usualy is very acsessable part , its a cilindar shaped part with a plug wired in which you can remove... Have a look at the likes of google images to find out what it looks like before you start to removing things.

If you diconect this , try starting your car and see if EAC is gone ..in which case the problem lies within the MAF ..... you either need a new one ...oooftt expensice ....in the reigon of 50 to a 100 depending...

If any one trys this ..and it works and would like more info on how to fix it .... reply to my post ....and ile gladly help...just too much to write at the moment lol.

P.s i hope this helps for some of the unfortunate people who joined the dreaded EAC club...

AS I SAID THIS MAY NOT WORK FOR SOME PEOPLE.

Hope this helped...excuse the spelling and language , im better in the garage,

.. bye guys

Lach