2010 Cadillac CTS Sedan AWD V6-3.6L Page 1039

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1039

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

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.