Circuit Description

The Accelerator Pedal Position (APP) sensor is mounted on accelerator pedal assembly. Sensor contains 3 individual APP sensors within one housing. There are 3 separate signal, ground and 5-volt reference circuits connected to APP and Throttle Actuator Control (TAC) modules. Each sensor has a unique functionality:

• The APP sensor No. 1 signal increases as accelerator pedal is depressed, from less than one volt (zero percent with pedal at rest) to greater than 2.0 volts (100 percent pedal travel).
• The APP sensor No. 2 signal decreases from greater than 4.0 volts (zero percent pedal travel) to less than 2.9 volts (100 percent pedal travel).
• The APP sensor No. 3 signal decreases from greater than 3.8 volts (zero percent pedal travel) to less than 3.1 volts (100 percent pedal travel).

Observe that signal circuits for APP sensor No. 2 and APP sensor No. 3 pull up to 5 volts and APP sensor No. 1 circuit pull to ground within the TAC module. DTC will set when APP sensor No. 1 disagrees with APP sensor No. 2 by greater than 10.5 percent and APP sensor No. 1 disagrees with APP sensor No. 3 by greater than 13 percent and conditions met for less than one second.