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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!

EP3_05

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

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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.

Mach69

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

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