Code P020, Open Fuel Pump Circuit: Action
PCM turns on SERVICE VEHICLE SOON light.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks for engine to start with fuel pump powered through fuel pump relay. If engine does not start, proceed to CODE P020 (2 OF 3).
- Checks circuit No. 120 for open or if no fault code is present.
- Checks for open in circuit No. 239 from fuse to fuel pump relay terminal No. 5.
- Checks for open in circuit No. 50 to fuel pump relay terminal No. 5.
- Checks if fuel pump will run to isolate a fuel pump control problem from a fuel pump problem.
- If greater than or equal to 10 volts is measured, fuel pump relay circuit is okay. Fuel pump relay is faulty.
- Checks for open in circuit No. 120 from fuel pump relay to fuel pump.
- Checks for proper control of fuel pump relay by PCM.
- Checks for an open in circuit No. 1250 (fuel pump ground).
- Checks circuit No. 239 for short to ground.
- Isolates when circuit No. 120 is shorted to ground.
- Checks circuit No. 120 for short to ground between oil pressure switch and PCM.
- Checks fuel pump harness for short to ground. If harness is okay, check circuit No. 120 from fuel pump relay terminal No. 3 for short to ground.