P019

DTC P019:

Fuel Pump Circuit:

CIRCUIT DESCRIPTION:
The PCM monitors fuel pump feedback voltage for 6 seconds after the ignition is turned 'ON' without the engine being cranked. The fuel pump relay will be energized for 2 seconds and then deenergized. If the voltage on the fuel pump feedback never drops below 7 volts during the first 6 seconds, Code P019 will set indicating voltage on CKT 120 with the fuel pump relay deenergized.

TEST CONDITION(S):
1. Code P012, P014 AND P015 not set.
2. Coolant temperature 50°C or greater.
3. No 4X reference pulses detected since key "ON" (engine not being cranked).

FAILURE CONDITION(S):
Fuel pump feedback voltage remained above 7 volts for 6 seconds after ignition on (fuel pump relay never deenergized).

ACTION TAKEN:
1. PCM turns "ON" the "SERVICE VEHICLE SOON" message.
2. IPC turns "ON" the "CHECK INFO CENTER" telltale.

NOTES ON FAULT TREE:
1. With the key "ON," engine "OFF," parameter PD 10, battery voltage, should read 0 volt (fuel pump relay deenergized). If PD10 shows voltage greater than 7 volts, the cause of voltage on CKT 120 must be repaired.
2. Checking for a shorted oil pressure sensor.
3. Checking for shorted fuel pump #1 or #2 relay.
4. Checking for voltage on CKT 120 at the PCM.
5. Checking for proper control of the fuel pump 1 relay by the PCM.

NOTES ON INTERMITTENTS:
If when the ignition is turned "OFF" and the oil pressure telltale does not light, check for the oil pressure sensor intermittently stuck closed or a short to voltage on CKT 313 keeping the fuel pump relays energized.

Also, Code P019 could be setting due to a sluggish or intermittently stuck fuel pump relay.