Note On Intermittents

Drive vehicle and observe park/neutral parameter display. Stop vehicle and wiggle shifter. If display changes, check defective switch or intermittent short to ground.

CODE EO91, PCM VOLTAGE CHECK

PCM Terminal		Voltage
F8
Switch Closed		0-0.3 Volts
Switch Open		Battery Voltage
C10
Switch Closed		0-0.3 Volts
Switch Open		Battery Voltage
F7
Switch Closed		0-0.3 Volts
Switch Open		Battery Voltage
A2
Switch Closed		0-0.3 Volts
Switch Open		Battery Voltage

Fig 1: PCM Code EO91, Schematic, Park/Neutral Switch Problem

Fig 2: Flow Chart 1 Of 2, PCM Code EO91, Park/Neutral Switch Problem (1 of 2)

Fig 3: Flow Chart 1 Of 2, PCM Code EO91, Park/Neutral Switch Problem (2 of 2)