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.

Fig 1: DTC 23 Schematic ("G" Series) APP No. 1 Circuit Range Fault

Fig 2: DTC 23 Schematic ("P" Series) APP No. 1 Circuit Range Fault

Fig 3: DTC 23 Flow Chart (All Models) APP No. 1 Circuit Range Fault