Thursday, December 12, 2019

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1831

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1831



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.



P2123



The APP sensor 1 voltage is greater than 4.82 volts for greater than 1 s or for a cumulative time of 4 s.



P2127



The APP sensor 2 voltage is less than 0.63 volt for greater than 1 s or for a cumulative time of 4 s.



P2128



The APP sensor 2 voltage is greater than 4.82 volts for greater than 1 s or for a cumulative time of 4 s.



P2138



* The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 0.25 volts when the sensor voltages are between



1.91-1.25 V.



* The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 0.31 volts when the sensor voltages are between



1.91-2.63 V.



* The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 1.7 volts when the sensor voltages are greater than



2.63 V.



* DTC P2138 sets if any of the above conditions exist for greater than 1 s or for a cumulative time of 4 s.



Action Taken When the DTC Sets



DTCs P2122, P2123, P2127, P2128, and P2138 are Type A DTCs.



Conditions for Clearing the DTC



DTCs P2122, P2123, P2127, P2128, and P2138 are Type A DTCs.



Diagnostic Aids



Test the current output of the 5-volt reference circuits if you suspect high resistance in the circuit. The current output should be greater than 80 mA

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