2010 Cadillac CTS Sedan AWD V6-3.0L Page 1834
Circuit/System Description
The accelerator pedal assembly contains 2 accelerator pedal position (APP) sensors. The APP sensors are mounted to the accelerator pedal
assembly and are not serviceable. The APP sensors provide a signal voltage that changes relative to pedal position. The engine control module
(ECM) supplies each APP sensor with a 5-volt reference circuit, a low reference circuit, and a signal circuit.
Both the APP sensors 1 and 2 signal percentages increase as the pedal is depressed, from approximately 0 percent at rest to above 95 percent when
fully depressed.
Conditions for Running the DTC
P2122, P2123, P2127, or P2128
* DTC P06A3 or P0697 are not set.
* The ignition is ON or the engine is operating.
* The ignition voltage is greater than 6 volts.
* The ECM is not commanding reduced power.
* The DTCs run continuously when the above conditions are met.
P2138
* DTCs P06A3, P0697, P2122, P2123, P2127, or P2128 are not set.
* The ignition is ON or the engine is operating.
* The ignition voltage is greater than 6 volts.
* The ECM is not commanding reduced power.
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P2122
The ECM detects that the APP sensor 1 voltage is less than 0.46 volt for less than 1 second.
P2123
The ECM detects that the APP sensor 1 voltage is greater than 4.7 volts for less than 1 second.
P2127
The ECM detects that the APP sensor 2 voltage is less than 0.32 volt for less than 1 second.
P2128
The ECM detects that the APP sensor 2 voltage is greater than 2.6 volts for less than 1 second.
P2138
The ECM detects that APP sensor 1 and APP sensor 2 disagree greater than 10 percent for less than 1 second.
OR
The ECM detects that both APP sensor 1 and APP sensor 2 are 5 percent greater than the learned minimum position for less than 1 second.
Action Taken When the DTC Sets
