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.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks circuit No. 120 between fuel pump relay and in-tank fuel pump.
- Checks battery voltage and ground circuits for in-tank fuel pump.
- Checks battery circuit and ground circuit for in-tank fuel pump.
- Checks battery voltage from PCM fuel pump control circuit to relay.
- Checks battery voltage to fuel pump relay.
- Checks for short to ground on circuit No. 120.
- Checks fuel pump feedback circuit.