Test Description

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 fuel pump relay ground circuit.
5. 6  - This step determines if a voltage is constantly being applied to the fuel pump relay.
6. 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.
7. 15  - This step jumps the fuel pump relay in order to activate the fuel pump.
8. 16  - This step tests for an open in the fuel pump feed circuit between the in-line connector and the fuel pump relay.
9. 17  - This step tests for an open or high resistance in the fuel pump ground circuit.
10. 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.