2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1077
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.
Conditions for Running the DTC
P0121
* The engine speed is greater than 480 RPM.
* The vehicle speed is 0 km/h (0 mph).
* The engine coolant temperature is greater than 5掳C (41掳F).
* The ignition voltage is greater than 8 V.
* The intake air temperature is greater than 5掳C (41掳F).
* DTC P0121 runs continuously when the above conditions are met.
P0122, P0123, P0222, and P0223
* The vehicle speed is 0 km/h (0 mph).
* The engine speed is greater than 250 RPM.
* The engine coolant temperature is greater than 5掳C (41掳F).
* The intake air temperature is greater than 5掳C (41掳F).
* The ignition voltage is greater than 8 V.
* The ignition is ON, with the engine OFF, or the engine is operating.
* DTC P0122 runs continuously when the above conditions are met.
P0221
* The engine speed is greater than 480 RPM.
* The vehicle speed is 0 km/h (0 mph).
* The engine coolant temperature is greater than 5掳C (41掳F).
* The ignition voltage is greater than 8 V.
* The intake air temperature is greater than 5掳C (41掳F).
* DTC P0221 runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0121
The throttle position sensor 1 disagrees greater than 9 % from throttle position sensor 2, or throttle position sensor 1 disagrees greater than 9 %
from the predicted value for greater than 1 s or a cumulative of 4 s.
P0122
The ECM detects the throttle position sensor 1 signal voltage is less than 0.18 V for greater than 1 s or a cumulative of 4 s.
P0123
The ECM detects the throttle position sensor 1 signal voltage is greater than 4.6 V for greater than 1 s or a cumulative of 4 s.
P0221
The throttle position sensor 2 disagrees greater than 9 % from throttle position sensor 1, or throttle position sensor 2 disagrees greater than 9 %
from the predicted value for greater than 1 s or a cumulative of 4 s.
P0222
The ECM detects the throttle position sensor 2 signal voltage is less than 0.16 V for greater than 1 s or a cumulative of 4 s.
