Code 20, Fuel Pump Circuit Open: Notes

Code will set if 4X fuel control pulses are being detected by PCM, fuel pump feedback voltage on circuit No. 120 is 2 volts or less and all condition are present for at least 1.3 seconds.

1. Checks circuit No. 120 between fuel pump relay and in-tank fuel pump.
2. Checks battery voltage and ground circuits for in-tank fuel pump.
3. Checks battery circuit and ground circuit for in-tank fuel pump.
4. Checks battery voltage from PCM fuel pump control circuit to relay.
5. Checks battery voltage to fuel pump relay.
6. Checks for short to ground on circuit No. 120.
7. Checks fuel pump feedback circuit.