Diagnostic Aids

If ignition is turned off and oil pressure telltale does not work properly, check for oil pressure sensor intermittently stuck closed or a short to voltage on circuit No. 1042, keeping fuel pump relay energized.

Fig 1: Code 19 Schematic (4.0L) Fuel Pump Circuit Shorted

Fig 2: Code 19 Diagnostic Flow Chart (4.0L) Fuel Pump Circuit Shorted