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My Honda 1993 engine light is on, a solid light. I jumped the 2 pins together (service check connector, located on the passenger's side). The engine light did not blink, it was still solid light. The only thing i noticed was that the light got a bit brighter with during the 2pins jumped together with a wire. i'm not sure what i'm doing wrong.
I reset the ECU and it the engine light was still the same.
update 7/14/19: Additional information, the low light setting of my headlight does not work. I switched the light bulbs around, it was still the same. I replaced one of the headlight, it was also still the same. I don't know if this has anything to do with CEL code 0.
The car start and runs fine. Nothing wrong with the car that i can tell. Code 0, sounds like something is wrong with the ECU. It highly possible the ECU got wet.
I'm trying to get DEQ tag for the car, so i can use it as daily. My solution is to get a new ECU? Since its a code 0, it will failed DEQ for sure?
side question: The CEL is giving code 0 with and without the jumped connection. Does this mean the ECU is bad? or more like short ground on the wire like your said?
The ECU isn't reporting the actual code unless the service connector is jumped. When not jumped, the CEL/MIL being on is just letting you know of an active issue that the ECU is able to report on. As for the Code 0 being reported, it will be worth your time investigating that circuit over immediately declaring the ECU as faulty and forking over money for a replacement (that can always come later on if completely necessary).
This is also a good opportunity for you to get to know your vehicle intimately...a learning experience of this kind is almost never a bad thing. Good luck, stick to your FSM and report back as to what you might find.
Last edited by MisereNoire; 07-12-2019 at 10:50 PM.
Reason: Additional thought
The first test I'd do is unplug ECU (always disconnect battery before unplugging or plugging in an ECU) then reconnect the battery, turn the key on and the CEL should not come on. If it does, there's a short in the wiring.
Here what i did today. I followed user mk378's instruction. i disconnect the battery, both the positive and negative leads. Then i disconnect the ECU. I reconnect the positive and negative leads to the battery (without the ECU plugged in). I turned the ignition to "on" position. No CEL code shown. What does this mean? I'm not too sure. Sorry i'm very new at car stuff.
I also tried something else. I bought a used ECU pulled from 1994 hatchback VX (same model as mine). The seller stated no CEL code. I disconnected the battery before removing the original ECU from the car. I plugged in the ECU that i just bought, and re-plugged the battery. I turned on the ignition, i got the damn CEL code 0 again. I'm note sure if i need to drive the car for while after switching the ECU. I let it idle for a bitl; the CEL code was still there.
mk placed a shiny object in front of you, and it was worth a shot.
Shiny objects are attractive. His test was shiny and attractive because it might allow you to avoid doing the basic electrical tests that require a multimeter.
This time, the shiny object did not pan out. Get back to the service manual troubleshooting.
07-12-2019, 04:16 PM
Honda 1993 civic engine code
