Hi to all,
Recently joined this forum to find info on the GM ECU 1228707 for my '89 Lotus Esprit Turbo. Turns out that the car stalled out a few weeks back after driving a short distance. Scan showed error code 42(EST circuit malfunction), after troubleshooting it found the ECU to be the fault. Replaced it with one from a '91 Chevy Beretta and all is well now. However, I would like to dig further into the ECU and diagnose the actual failure. Does anyone have an internal schematic for this 1228707 model ECU? I have the wiring diagram(pinout) for it but not the internal circuitry. Drop me a line and let me know if you're able to help and thanks in advance.
Tom S.
'89 Lotus Esprit Turbo