2010 Cadillac CTS Sedan AWD V6-3.6L Page 1197
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0121
- Throttle Position Sensor 1 Performance
DTC P0122
- Throttle Position Sensor 1 Circuit Low Voltage
DTC P0123
- Throttle Position Sensor 1 Circuit High Voltage
DTC P0221
- Throttle Position Sensor 2 Performance
DTC P0222
- Throttle Position Sensor 2 Circuit Low Voltage
DTC P0223
- Throttle Position Sensor 2 Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The throttle body assembly contains 2 throttle position sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable.
The TP sensors provide a signal voltage that changes relative to throttle blade angle. The Engine Control Module (ECM) supplies the TP sensors
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
