P019

This article has been updated with bulletin No.: 51-65-10.

DTC PO19:

Fuel Pump Control Circuit:

CIRCUIT DESCRIPTION
The Powertrain Control Module (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 CONDITIONS
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
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 PD10, 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 the ignition is turned "ON" and the oil pressure telltale does not light, check for the oil pressure sensor intermittently stuck closed.

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