OK. The first thing you need to do is get the codes retrieved from the computer as they will isolate the problem to a specific circuit for further diagnosis.Most parts stores do this for Free.Just tell them your light is on and ask if they will check codes.Most will.They do this in an effort to sell parts.Get the codes and post back if you need more help.Sometimes you may get enough help at the parts store to fix it if it's something obvious.I will post the procedure for you to retieve codes yourself if your up to it.

To retrieve codes from the ECM without the use of a scan tool:

1. Locate the diagnostic terminals at the bottom of the under dash fuse block.

2. Turn the ignition switch ON but do not start the engine.

3. Insert a spare fuse into the diagnostic terminals. This completes the ground circuit for the ECM diagnostic circuit. The CHECK ENGINE light should display Code 12 and/or any stored codes.

   1. An alternate diagnostic position is provided under the hood. The diagnostic connector is located next to the ignition coil.

   2. Use a jumper to connect the diagnostic switch terminal to the ground terminal.

4. Read the flashes of the CHECK ENGINE light to determine the codes. If the light flashes a Code 12, the system is functioning normally.

Images available only to Customers.

CLEARING CODES

Stored fault codes may be erased from memory at any time by removing power from the ECM for at least 30 seconds. This time period must be increased as the temperature drops. It may be necessary to clear stored codes during diagnosis to check for any recurrence during a test drive, but the stored codes must be written down when retrieved. The codes may still be required for subsequent troubleshooting. Whenever a repair is complete, the stored codes must be erased and the vehicle test driven to confirm correct operation and repair.

The ignition switch must be OFF any time power is disconnected or restored to the ECM. Severe damage may result if this precaution is not observed.

Removing the TAIL LAMP fuse from the under dash fuse box will interrupt power to the ECM without blanking other memories within the vehicle. The pink, 30 amp main fuse may be removed from the underhood fuse holder on the right front fender apron, but this will also disconnect power to the clock and the radio.

"It is much wiser and cost efficient to ask a question than to stumble blindly through your auto repairs".Please Click Accept if my answer was helpful.