Test Description

The number below refers to the step number in the diagnostic procedures.

1. 2
   
   Command both ON and OFF states. Repeat commands as necessary.
2. 3
   
   This step determines if condition is located on coil side or switch side of circuit.
3. 4
   
   This step verifies PCM is providing voltage to fuel pump relay.
4. 5
   
   This step tests for an open in fuel pump relay ground circuit.
5. 6
   
   This step determines if voltage is constantly being applied to 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 fuel pump in-line harness connector isolates fuel pump supply voltage circuit.
7. 15
   
   This step jumps fuel pump relay in order to activate fuel pump.
8. 16
   
   This step tests for an open in fuel pump feed circuit between in-line connector and fuel pump relay.
9. 17
   
   This step tests for an open or high resistance in fuel pump ground circuit.
10. 20
    
    This step determines if condition with circuit is intermittent. If fuse does not open, inspect supply voltage circuit between fuse and fuel pump for an intermittent condition.