Hook it up to a computer at an Auto Zone or something like that and get a code. It could be any of the following:
- Problem with stand-by memory circuit.
- Indicates a problem with the MAP sensor pneumatic system - MAP sensor voltage too low or too high.
- A problem with the vehicle speed sensor signal. No speed sensor signal detected during driving conditions.
- Loss of battery voltage
- Engine coolant temperature indicating engine temperature cold too long.
- Oxygen sensor voltage not fluctuating.
- Coolant sensor voltage too high or too low.
- Throttle body temp sensor below acceptable parameters.
- Throttle position sensor voltage too high or too low.
- Automatic Idle Speed motor detects a shorted condition in one or more circuits
- Peak Injector current has not been reached.
- One of the injector control circuit output drivers does not respond properly to the control signal.
- Problem with the canister purge solenoid circuit
- An open or shorted condition detected in the EGR transducer circuit.
- Air conditioning clutch relay circuit open or shorted.
- Open or shorted condition found in the speed control vacuum or vent solenoid circuit.
- Radiator fan relay circuit open or shorted.
- Problem with the air switching solenoid circuit.
- Open or shorted condition detected in the torque converter unlock solenoid circuit.
- Problem with charging system. Voltage below 11.75.
- ASD (Automatic ShutDown) relay control open or shorted.
- Engine misfire in one or more cylinders.
- Ambient/Battery Temperature too high or too low.
- Transmission temp sensor not indicating warm condition.
- Charging system voltage too high.
- Charging system voltage too low.
- Oxygen sensor signal indicates a lean condition.
- Oxygen sensor signal indicates a rich condition.
- Internal PCM failure.
- No cam signal to PCM.
- End of code message.
- Unsuccessful attempt to update EMR mileage in the controller EEPROM.
- PCM failure. EEPROM write denied.
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