Hi. Changed my oil this morning and decided to check if my ECU (PM5) was throwing any codes. I'm driving a stock 90 CRX DX with rebuilt D15B2. This is what I read from it...

blink - pause - blink - pause - 19 blinks - pause - 20 blinks - and then it repeats itself but with only 1 blink between the 19 blinks and 20 blinks.

From what I've searched I've found that I have the following codes:

Code 1: Oxygen Sensor "A"
Code 19: Automatic Transmission Lock Up Control Solenoid Valve
Code 20: Electric Load Detector

So, for Codes 1 and 20, I know to check my Primary Oxygen Sensor and then check all my grounds. But the thing that gets me is Code 19. I've got a manual transmission and I'm getting a code regarding an automatic transmission? What gives? I didn't try to reset my ECU though. Gonna do that at lunch and see if any codes disappear or if more will appear! All I have to do to reset my ECU is disconnect the negative from the battery, correct?

Thanks in advance! And yes, I searched!

 

To reset the ecu either pull the battery cable or remove the hazard fuse from the underhood fuse box.

 

Reset my ECU at lunch and Codes 1 and 19 are gone, leaving Code 20 and me checking all my grounds tonite. Thanks for the help 91civic.

 

Check your fuses for code 20, make sure none are blown.

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