trouble codes. HELP!

demon40 said:

well i have a turbo charged cobra that keeps tripping trouble codes. When I first start the car the light does not come on, but after driving it for a bit the check engine light comes on and i get three trouble code. 511, Electronic Control Assembly (eca) problem-read-only memory (rom) test failure. 538, insufficient RPM change during dynamic response test (engine run self test), or invalid cylinder balance test-throttle position movement, or invalid cylinder balance test-cylinder identification problems. If any one has any ideas as to what the problem could be it would be greatly appreciated.



Thanks in advance
Brandon

Click to expand...

what's the third trouble code number?

511 means you need a new PCM. But maybe there is someone else here that can shed some light on that code.

538 = did you cycle the OD switch, turn the steering wheel 1/2 turn each way and cycle the brake pedal once at the proper time? If you didn't, theres you answer.

fyi - http://www.allfordmustangs.com/Detailed/445.shtml for a better code layout.

When was the last time you disconnected the battery from the system to reset the computer? If you haven't done it recently, disconnect the ground, depress the brake pedal for 30 secs, then reconnect and drive the car until the CEL comes on again.

The computer may just need to be reset. I have seen this many times with other 12V boards and I am assume our PCM is likely susceptible to low voltage freak-outs or spikes.
Scott