Acura Repair Questions? Ask a Mechanic for Answers ASAP
what model is your 91 Acura? I might be able to help
I'm guessing probably an Integra. And you indicated you have no power to the ECU? is that correct. Have you done any testing at the PGM-FI main relay?
here is a schematic of the main relay
Let me make sure I understand what you are saying. Are you indicating that you have battery voltage from the main relay to the ECM? I thought you did not have power to the ECM. If you have power to the ECM from the main relay then that changes what I would give you to test. Please clarify so I can try ad give you correct testing. If you do have power to the ECM then my net question would be does you check engine light come on and stay on or does it come on for a few seconds after you turn the key on and then shut off. If it never comes on and you have power to the ECM then I would advise to check the ECM grounds and if they are good then check for a shorted 5 v reference circuit.
did you get your problem figured out? if not let me know