Diagnostic Aids

Scan tester displays APP No. 1 position in volts, and should display .45-.95 volt with throttle closed and ignition on or engine at idle. Voltage should increase at a steady rate as throttle is moved toward WOT. Also, 90 percent pedal travel is acceptable for correct APP operation.

Monitor APP No. 1 sensor while applying accelerator pedal with engine off and ignition on. Display should vary from about .74 volt with throttle closed, to about 3.7 volts with throttle at WOT. DTC 22 will set if circuit is open.

Fig 1: DTC 22 Schematic ("G" Series) APP No. 1 Circuit Low (Models With PCM)

Fig 2: DTC 22 Schematic ("P" Series) APP No. 1 Circuit Low (Models With PCM)

Fig 3: DTC 22 Flow Chart (All Models) APP No. 1 Circuit Low (Models With PCM)