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Home >> Cadillac >> 1993 >> Seville Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Pcm >> Pcm Code Charts >> Pcm Code P019 - Shorted Fuel Pump Feedback Signal >> Note On Intermittents

Note On Intermittents

Probe fuel pump test point using a voltmeter to ground. Turn ignition on, and observe voltmeter. Voltmeter should indicate battery voltage for 2 seconds and then drop to zero. If voltage reading stays at battery voltage for longer than 2 seconds, check for sticking fuel pump relay contacts. Repeat test several times. Continue probing fuel pump test point to ground. Start engine, and then turn it off. Voltage should immediately drop to zero. If voltage does not immediately drop to zero, check oil pressure switch contacts.

Fig 1: PCM Code P019 Schematic - Shorted Fuel Pump Feedback Signal
G93C40289Courtesy of GENERAL MOTORS CORP.
Fig 2: PCM Code P019 Flow Chart - Shorted Fuel Pump Feedback Signal
G93F40290Courtesy of GENERAL MOTORS CORP.