LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 1988 >> Seville STS >> Repair and Diagnosis >> Engine Performance >> System >> DFI ECM Tests W/Codes >> ECM Code EO19 - Shorted Fuel Pump Circuit >> DFI ECM Tests W/Codes >> Notes On Intermittents
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Notes On Intermittents

Probe fuel pump test point with a voltmeter to ground. Turn key on and observe voltmeter. Voltmeter reading should be battery voltage for 2 seconds and then drop to zero. If voltmeter stays at battery voltage for longer than 2 seconds, check fuel pump relay contacts for sticking. Repeat this test several times.

Continue probing fuel pump test point to ground. Start engine and then turn it of. Voltage should drop immediately to zero. If not, check oil pressure switch for sticking contacts.

Review snapshot data parameters stored with this code to verify failure. If failure is verified, check and repair intermittent wiring connection or sensor.

Fig 1: Schematic, Code EO19, Shorted Fuel Pump Circuit
G57237
Fig 2: Flow Chart, Code EO19, Shorted Fuel Pump Circuit
G57309
Fig 3: Flow Chart, Code EO19, Shorted Fuel Pump Circuit
GB0048519