Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
I have a 93 Mr2 N/A MT no start no Engine Light. All fuses leading to the ECU have been checked. The Engine Light has been tested by grounding the W terminal and works. I have checked the +B/+B1/ BATT Terminals at the ECU all 12 volts. Checked grounds E01/E02/E1 all good. Is there anything that could keep the ECU from coming alive?
So the ecu is not communicating with a scanner? Have you checked the 5 volt ref circuit at the tps, map or maf? If you have 5 volts the you will need wiring diagrams for the dlc connector and check for power, grounds, can bus signal etc.
