Pcm Code EO19, Shorted Fuel Pump Circuit: Action:

PCM turns on SERVICE VEHICLE SOON message on CCDIC panel. PCM monitors fuel pump feedback voltage 4 seconds after ignition is turned on without the engine being cranked. The fuel pump relay will be energized 2 seconds and then de-energized.

If voltage on fuel pump feedback never drops below 7 volts during the first 4 seconds, Code EO19 will set indicating voltage on circuit No. 120 with fuel pump relay de-energized. The oil pressure switch must be disconnected.

1. With key on, engine off, fuel pump should not be running and fuel pump feedback (PCM parameter ED10) should be zero volts. If ED10 shows voltage greater than 7 volts, circuit No. 120 must be repaired.
2. This diagnostic chart branch checks shorted oil pressure switch contacts, powering fuel pump at all times. A shorted oil pressure switch will cause Code EO19 to set.
3. This checks shorted fuel pump relay.
4. This checks voltage on circuit No. 120 at PCM.
5. This checks proper control of the fuel pump relay by the PCM.