E019

Code E19:

Fuel Pump Circuit:

DESCRIPTION:

The PCM/ECM monitors fuel pump feedback voltage for four 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 4 seconds, code E19 will set indicating voltage on CKT 120 with the fuel pump relay deenergized. The oil pressure switch is located on the oil filter housing; it must be disconnected.

TEST CONDITIONS:

1. Code E12 not set.
2. Ignition On.
3. No reference pulses detected since key on.

FAILURE CONDITIONS:

Fuel pump feedback voltage greater than 7 volts for 4 seconds after ignition on (fuel pump relay never deenergized).

ACTION TAKEN:

1. PCM/ECM turns on "SERVICE ENGINE SOON" telltale.

NOTES ON FAULT TREE:

1. At key on engine off, parameter P.0.7, battery voltage, should read 0 volts (fuel pump relay deenergized). If P.0.7 shows voltage greater than 7 volts, the cause of voltage on CKT 120 must be repaired.

2. Checking for shorted oil pressure switch. A shorted oil pressure will cause a code E19 to set.

3. Checking for a shorted fuel pump relay.

4. Checking for voltage on CKT 120 at the PCM/ECM.

5. Checking for proper control of the fuel pump relay by the PCM/ECM.

NOTE ON INTERMITTENTS:

Probe the fuel pump test point with a voltmeter to ground. Key on, observe voltmeter - it should read battery voltage for 2 seconds then drop to 0. If the voltmeter stays at battery voltage for longer than 2 seconds, check for fuel pump relay contacts sticking. Repeat the test several times. Continue probing the fuel pump test point and crank and start engine then key off - voltage should drop immediately to 0. If not, check oil pressure switch for sticking contacts. Check for relay terminals or bulkhead connector terminals bent, contacting each other causing 12 volts on CKT 120.