E019

TEST CONDITIONS
1. Code EO12 not set;
2. ignition on;
3. No reference pulses detected since key on;
4. ignition has been on for equal to or greater than 4 seconds;
5. Coolant temperature equal to or greater than 0°C.

FAILURE CONDITIONS
Fuel pump feedback voltage did not go below 7 volts within 4 seconds after ignition on (fuel pump relay never deenergized).

ACTION TAKEN
1. ECM turns an "Engine Control System Fault" telltale;
2. ECM commands BCM to display "Service Soon" message on Driver Information Center (DIC).

DESCRIPTION
The 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 3 seconds and then deenergized. if the voltage on the fuel pump feedback never drops below 7 volts during the first 4 seconds, Code EO19 will set indicating voltage on CKT 120 with the fuel pump relay deenergized.

Notes on Fault Tree
1. With the key on, engine off parameter ED10, battery voltage, should read 0 volts (fuel pump relay deenergized). If ED10 shows voltage greater than 10.9 volts, the cause of voltage on CKT 120 must be repaired.
2. Checking for a shorted oil pressure switch. A shorted oil pressure switch will cause a Code EO19 to set.
3. Checking for a shorted fuel pump relay.
4. Checking for voltage on CKT 120 at the ECM.
5. Checking for proper control of the fuel pump relay by the ECM.

NOTES ON INTERMITTENTS
Probe the fuel pump test point with a voltmeter to ground. Key on and observe voltmeter - it should read battery voltage for 2 seconds then drop to 0 volts. 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 with a voltmeter and start engine then key off - voltage should drop immediately to 0. If it doesn't, 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.