Test Description
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedures.
- 2
This step determines if the condition is on the coil side, or the switch side of the fuel pump relay. Listen for an audible click as the fuel pump relay is commanded ON and OFF. Repeat the commands as necessary in order to verify the fuel pump relay operation. - 4
This step tests the control circuit of the fuel pump relay. The test lamp should turn ON and OFF with the scan tool commands. Repeat the commands as necessary. - 8
This step verifies the fuel pump operation. Listen for the fuel pump as you command the fuel pump ON. Repeat the commands as necessary in order to verify the fuel pump operation. - 9
This step tests the ignition voltage circuit of the fuel pump relay. - 10
This step verifies the fuel pump operation. If the test lamp blinks, then the fuel pump and circuits are okay. - 13
The rear fuel level sensor voltage must be above the specified value in order to continue with the diagnostic procedure. - 15
This step tests for a fuel flow condition. If the rear fuel level sensor voltage does not decrease as the fuel pump is operating, a restriction in the fuel lines or rear sender is the probable cause of the DTC. - 16
If a restriction in the fuel lines, or rear fuel sender is not isolated, a mechanical condition exists in the fuel pump. Replace the fuel pump.