Diagnostic Aids

Scan tester displays APP No. 3 position in volts, and should display 4 volts with throttle closed and ignition on or engine at idle. Voltage should decrease at a steady rate as throttle is moved toward WOT. Also, 90 percent pedal travel is acceptable for correct APP operation.

Monitor APP No. 3 sensor while applying accelerator pedal with engine off and ignition on. Display should vary from about 4 volts with throttle closed, to about 2 volts with throttle at WOT. If the 5-volt reference circuit is open or the APP 3 signal circuit is shorted to ground, DTC 64 will set.

Fig 1: DTC 64 Schematic ("G" Series) APP NO. 3 Circuit Low (Models With PCM)

Fig 2: DTC 64 Schematic ("P" Series) APP NO. 3 Circuit Low (Models With PCM)

Fig 3: DTC 64 Flow Chart (All Models) APP NO. 3 Circuit Low (Models With PCM)