Note On Intermittents

Backprobe PCM terminal 3E13 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 backprobing PCM terminal and start and turn off engine. Voltage should immediately drop to zero. If voltage does not immediately drop to zero, check oil pressure switch contacts.

Fig 1: Code P019 Schematic (DeVille)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P019 Flow Chart (DeVille)

Courtesy of GENERAL MOTORS CORP.