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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 251 (Engine Controls - System & Component Testing - 3.4L) >> Fuel Systems >> Fuel Pump Electrical Circuit Diagnosis (ALERO & Grand Am) >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic procedure.

  1. 2  - Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3  - This step determines if the condition is located on the coil side or the switch side of the circuit.
  3. 4  - This step verifies that the PCM is providing voltage to the fuel pump relay.
  4. 5  - This step tests for an open in the ground circuit to the fuel pump relay.
  5. 6  - This step determines if a voltage is constantly being applied to the fuel pump relay.
  6. 12  - This tests for a grounded voltage supply circuit. The FP-INJR fuse (15-amp) supplies power to fuel pump and the fuel injectors. Disconnecting the fuel pump in-line harness connector isolates the fuel pump voltage supply circuit.
  7. 15  - This step jumps the fuel pump relay to activate the fuel pump.
  8. 17  - This step tests for an open or high resistance in the fuel pump ground circuit.
  9. 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.
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