Pcm Code EO20, Open Fuel Pump Circuit (2 Of 3)

NOTE: Test numbers refer to test numbers on diagnostic chart.

1. Checks proper control of fuel pump relay by the PCM.
2. Checks open from fuel pump fuse to relay pin No. 4.
3. Checks open from relay pin No. 4 to ground.
4. Checks continuity the complete fuel pump circuit from fuse No. 2 through the fuel pump windings to ground. Using a test light to jumper contact cavities of the relay connector, test light should illuminate if circuit is okay. If circuit is okay, fuel pump relay is faulty.
5. If relay or relay drive circuits are grounded, PCM may be damaged by excessive current draw if battery voltage is greater than 16 volts. Repair fault and check proper operation.
6. Fault is most likely at PCM connector or PCM. Before replacing PCM, refer to CHART C-1, PCM REPLACEMENT CHECK.
7. Refer to WIRING DIAGRAMS article in this section.

Fig 1: PCM Code EO20, Schematic, Open Fuel Pump Circuit

Fig 2: Flow Chart 2 Of 3, PCM Code EO20, Open Fuel Pump Circuit (1 of 2)

Fig 3: Flow Chart 2 Of 3, PCM Code EO20, Open Fuel Pump Circuit (2 of 2)