On my Honda Civic DX 2000, the Check Engine Light (CEL) has been on for a while, so I brought the car to AutoZone to have the OBD code read, but I was told that no code is stored in the computer.

Therefore I tried to get the OBD code myself by shorting the Service Check Connector (SCC) terminals. The SCC looks like the small connector in the following picture:

(source: instructables.com)

I actually read an OBD code before by using this method before, so I am shorting the correct SCC terminals.

However, the following things happen this time.

  1. When I turn the ignition switch to position I, the CEL goes on and then goes off.

  2. When I start the engine, the CEL is off first. However, when the engine is started and then the engine speed drops a little, 10 seconds, then the CEL light comes on and does not flash at all.

What might be wrong?

4 Answers 4


If the photograph attached is an actual photograph of your car then the OBD port appears to be in two pieces. The blue connector on the right of the photograph should be clipped into the main piece along with the other one already in place on the left.

With only half a loom connected, you are unlikely to see any OBD codes although I believe surprisingly few pins are actually used to transmit fault codes.


Buy your own reader. Look at the ELM327 bluetooth reader. It's about $20.

If your check engine light is on the car had a code. To be honest, this sounds like a case of a human error. Luckily, Eric the Car Guy has a video about pulling Honda codes without a scanner.

Watch the video and make sure you are doing it correctly: https://www.youtube.com/watch?v=8M5BaAa6tCM


The Check Engine Light flashing on doesn't necessarily mean that there is something wrong but it could be a good indicator that something is about to go wrong the only problem here is not knowing when or which part is about to fail. I know the anticipation of possibilities is as much fun as watching paint dry so if I were you I would take the time to at least check each of your cylinders and each Fuel Injector for full spark . You just might catch it before it goes into full fault. Remember: When checking for spark at the coil or at the distributor cap; The line that gives you the strongest electrical flow is usually the line leading to the mis-firing cylinder.


CEL means engine is not burning properly and it could mean a dozen things. Even without OBD code, you could still solve the mystery by observing the symptoms. Normally symptom is more pronouced at idle. It looks like you might have to do without the help of OBD II. Gather more symptoms.

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