Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Pontiac Aztek FWDFACTORY OEM SERVICE PROCEDURE
Test Description
The numbers below refer to the step numbers on the diagnostic procedure.
- 2 - Command both the ON and OFF states. Repeat the commands as necessary.
- 3 - This step determines if the condition is located on the coil side or the switch side of the circuit.
- 4 - This step verifies that the PCM is providing voltage to the fuel pump relay.
- 5 - This step tests for an open in the fuel pump relay ground circuit.
- 6 - This step determines if a voltage is constantly being applied to the fuel pump relay.
- 12 - This tests for a grounded fuel pump supply voltage circuit. The fuel pump fuse supplies power to fuel pump. Disconnecting the fuel pump in-line harness connector isolates the fuel pump supply voltage circuit.
- 15 - This step jumps the fuel pump relay in order to activate the fuel pump.
- 16 - This step tests for an open in the fuel pump feed circuit between the in-line connector and the fuel pump relay.
- 17 - This step tests for an open or high resistance in the fuel pump ground circuit.
- 20 - This step determines if the condition with the circuit is intermittent. If the fuse does not open, inspect the supply voltage circuit between the fuse and the fuel pump for an intermittent condition.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.