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1993 Honda Accord D4 light stuck on

college man
college man

[quote=”andyknight3″ post=203803]College Man,

Thanks for the advice. My concern is that I can’t seem to reset the tcu. I tried disconnecting the negative battery terminal, and separately I tried removing the backup and ecu fuses. In both cases, when I turned the car back on the D4 light remained stuck on. I saw the flowchart for diagnosis that was posted in that thread but I’m not sure I can follow it ( I don’t really know what “test harness ‘A'” is), unless its simply a matter of checking voltage at a certain connector pin. I’m hesitant to just replace the tcu, I don’t want to just keep throwing parts at the issue until it goes away, but if theres reason to believe that that’s the likely culprit then I suppose I have no option. Thanks again for all the help!


Actually you are correct on checking the voltage. Unplug the TCM connector and check the voltage at pin A8 and body ground.
Have the ignition switch in the start position while doing the test. If the 12volts is seen at that pin the TCM is bad. keep us posted
on your progress.