Check Engine Light Doesnt Come On With Key On

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This is called the self test mode for the computer.

Check engine light doesnt come on with key on.

Do not check resistances. So if you go to the ecm and check for voltage on pin a5 then you can eliminate everything except the ecm. Here is the deal run jumper wire at diagnostic connection but instead of first 2 slots go with 1 and 4 if check engine light comes on its the circuit board in module under dash its about 2 inches wide 4 inches long either lite green or gray or black plastic tube box with a door on one end will be tape up alongside wiring cut tape open lid and there is a small circuit board that handles lie and codes from computer. It then goes to the electronic control module.

The same power feed in the cluster powers up the seatbelt light abs and a couple others. I doubt any of the things mentioned have any affect on the check engine light. Ok it looks like fuse 7 in the dash fuse box supplies power to the check engine warning light. This unit is a solid state unit.

When turning the ignition switch to the run position the check engine light should come on. Radio on mode only allows you to use the radio. Since you said the other lights work then. A loose fuel cap is one of the most common reasons why the check engine light turns on.

Radio on and full systems on. The light bulb for cel has a power feed with 12 volts runing to it with key on all the times. This way you can sit and listen to the radio without everything else draining. It notably prevents gasoline fumes from leaving.

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