Diagnostic Aids

Scan tester displays APP No. 2 position in volts, and should display about 4.5 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. 2 sensor while applying accelerator pedal with engine off and ignition on. Display should vary from about 4.5 volts with throttle closed, to about 1.5 volts with throttle at WOT.

Fig 1: DTC 27 Schematic ("G" Series) APP NO. 2 Circuit Range Fault

Fig 2: DTC 27 Schematic ("P" Series) APP NO. 2 Circuit Range Fault

Fig 3: DTC 27 Flow Chart (All Models) APP NO. 2 Circuit Range Fault