How to Test the Fuel Gauge on a 2000 Firebird

The fuel gauge on a 2000 Pontiac Firebird is located in the instrument cluster panel, on the dashboard. This gauge is controlled by the powertrain control module (PCM). The PCM continuously receives information from the in-tank fuel sending unit about the fuel level and adjusts the fuel gauge accordingly. The fuel gauge itself rarely fails. Problems are generally caused by the sending unit inside the tank, frayed wiring between the PCM and the gauge, or a faulty PCM. An automotive scan tool is required to test the gauge to ensure that the problem lies elsewhere.

Things You'll Need

• Automotive scan tool

Instructions

1. Shift the Firebird's transmission into park or first gear (if yo have a manual transmission). Turn off the ignition and apply the parking brake. Turn the ignition back to the "On" position but do not start the engine.

2. Connect the scan tool's data cable to the Firebird's diagnostic data port located underneath the dashboard, just below the steering wheel.

3. Power on the scan tool and allow it to boot up. Follow the on-screen instruction to enter in the vehicle's powertrain information.

4. Select "Bi-Directional Tests" from the scan tool's main menu. Select "Gauges," then choose "Fuel."

5. Follow the on-screen instructions on the scan tool to move the fuel gauge to the "F" mark and then back down to "E." If the fuel gauge responds to the scan tool then the fuel gauge is functioning properly.

Tips & Warnings

• An automotive scan tool is a computer unit designed to run tests and perform diagnostic procedures on passenger vehicles. Scan tools are available from auto parts stores and automotive tool retailers.