2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1163
P0223
DTC P0121-P0123 or P0221-P0223 (Without LF1, LFW)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
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 throttle position sensors are mounted to the throttle body assembly and are not
serviceable. The throttle position sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM)
supplies the throttle position sensors with a common 5 V reference circuit , a common low reference circuit, and two independent signal circuits.
The throttle position sensors have opposite functionality. Throttle position sensor 1 signal voltage decreases from greater than 4 V at idle to less
than 1 V at wide open throttle (WOT). Throttle position sensor 2 signal voltage increases from less than 1 V at idle to greater than 4 V at WOT.
