P0121-Apps 5-Volt Supply Circuit: Notes

Fig 1: Accelerator Pedal Position Sensor & Throttle Body Circuit Schematic

Courtesy of CHRYSLER LLC

When Monitored : Ignition on.
Set Condition : When the PCM recognizes the APP Sensor 5-Volt Supply circuit voltage is below 1.0 volt or higher than 5.2 volts.

Possible Causes
APP SENSOR 5-VOLT SUPPLY CIRCUIT SHORT TO VOLTAGE
APP SENSOR 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND
APP SENSOR 5-VOLT SUPPLY CIRCUIT SHORT TO SENSOR GROUND CIRCUIT(S)
APP SENSOR 5-VOLT SUPPLY CIRCUIT OPEN
TP SENSOR 5-VOLT SUPPLY CIRCUIT SHORT TO VOLTAGE
TP SENSOR 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND
TP SENSOR 5-VOLT SUPPLY CIRCUIT SHORT TO SENSOR GROUND CIRCUIT(S)
ACCELERATOR PEDAL POSITION SENSOR
POWERTRAIN CONTROL MODULE

For a complete Powertrain Control Module Circuit Diagram, refer to SCHEMATICS AND DIAGRAMS .