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Home >> Cadillac >> 1990 >> Seville Base, 4T60/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> ECM Trouble Code Charts >> ECM Code EO19: Shorted Fuel Pump Circuit >> Note On Intermittents
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Note 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 test several times. Continue probing fuel pump test point to ground. Start engine and then turn it off. Voltage should drop immediately to zero. If not, check oil pressure switch contacts.

Fig 1: ECM Code EO19 Circuit Diagram
G90D21728
Fig 2: ECM Code EO19 Flow Chart
G90H13695