2010 Cadillac CTS Sedan AWD V6-3.6L Page 1036
with a common 5 V reference circuit , a common low reference circuit, and two independent signal circuits. The TP sensors have opposite
functionality. TP sensor 1 signal voltage decreases from greater than 4 V at idle to less than 1 V at wide open throttle (WOT). TP sensor 2 signal
voltage increases from less than 1 V at idle to greater than 4 V at WOT.
Conditions for Running the DTC
* The ignition voltage is greater than 7 V.
* The ignition is ON, with the engine OFF, or the engine is operating.
* DTC P0121 runs continuously once the above conditions are met.
Conditions for Setting the DTC
P0121
The TP sensor 1 disagrees greater than 9 percent from TP sensor 2, or TP sensor 1 disagrees greater than 9 percent from the predicted value for
greater than 1 s.
P0122
The ECM detects the TP sensor 1 signal voltage is less than 0.18 V for greater than 1 s.
P0123
The ECM detects the TP sensor 1 signal voltage is greater than 4.6 V for greater than 1 s.
P0221
The TP sensor 2 disagrees greater than 9 percent from TP sensor 1, or TP sensor 2 disagrees greater than 9 percent from the predicted value for
greater than 1 s.
P0222
The ECM detects the TP sensor 2 signal voltage is less than 0.16 V for greater than 1 s.
P0223
The ECM detects the TP sensor 2 signal voltage is greater than 4.9 V for greater than 1 s.
Action Taken When the DTC Sets
* DTCs P0121 and P0221 are Type B DTCs.
* DTCs P0122, P0123, P0222, and P0223 are Type A DTCs.
Conditions for Clearing the DTC
* DTCs P0121 and P0221 are Type B DTCs.
* DTCs P0122, P0123, P0222, and P0223 are Type A DTCs.
Diagnostic Aids
If there is a condition with the TP sensors the ECM defaults to reduced power mode for the entire ignition cycle, even if the condition is corrected.
Reference Information
Schematic Reference
Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Throttle Actuator Control (TAC) System Description (See: Powertrain Management/Computers and Control Systems/Description and
Operation/Throttle Actuator Control (TAC) System Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
