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The check engine light is not controlled by a relay, the bulb is grounded directly by the engine computer.
Horn relay in engine compartment by the PCM
The Fuel Pump Relay is at position 3 in the engine bay relay plate
The main relay will give an check engine light to indicate that the electrical system is bad.
Normal operation to cool engine Relay stuck in closed position?
It means that your relay is out, and has to be replaced with a new one, and once its been replaced, your check engine light will turn off in about 20 minutes or so.
Check the fuse box in the engine compartment
Check for continuity coming from the switch from the "start" position. If it is good, then the starter is defective, or a loose wire somewhere around the engine.
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The relay is in a block of relays on the left side of the engine compartment just back of the air cleaner. The relay cover should tell you what position the fuel pump relay is in.
You can find the wiring diagram for a relay position for a 1997 Mercury Sable in the owner's manual. You can also check local auto stores.
The blower motor relay switch in the Honda Civic is located at the center of the engine closest to the firewall. The relay is engaged when the ignition is turned to the on position.