2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1837

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1837

DTC P2123

- Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage

DTC P2127

- Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

DTC P2128

- Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

DTC P2138

- Accelerator Pedal Position (APP) Sensors 1-2 Not Plausible

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The accelerator pedal assembly contains two accelerator pedal position (APP) sensors. The APP sensors are mounted in the pedal assembly and are

not serviceable. The APP sensors provide a signal voltage that changes relative to the position of the accelerator pedal. The engine control module

(ECM) supplies a separate 5-volt reference and low reference circuit for each of the APP sensors.

The APP sensor 1 signal voltage increases as the pedal is depressed, from approximately 1.0 volt at rest to approximately 4 volts when fully

depressed. The APP sensor 2 signal voltage increases as the pedal is depressed, from approximately 0.5 volt at rest to approximately 2 volts with

the accelerator pedal fully depressed.

Conditions for Running the DTCs

* The ignition is ON or the engine is operating.

* The ignition voltage is greater than 8 volts.

* The DTCs run continuously once the above conditions are met for greater than 200 ms.

Conditions for Setting the DTC

P2122

* The APP sensor 1 voltage is less than 0.74 volt and APP sensor 2 voltage is less than 0.62 V for greater than 1 s or for a cumulative time of 4

s.

OR

* The APP sensor 1 voltage is less than 0.74 volt for greater than 1 s or for a cumulative time of 4 s.