2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1951

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1951

Circuit/System Description

The throttle body assembly contains 2 throttle position (TP) 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 and TP sensor 2 signal voltage increases as the accelerator pedal

increases to wide open throttle (WOT).

Conditions for Running the DTC

* DTC P0641 or P0651 is not set.

* The run/crank or powertrain relay voltage is greater than 6 V and reduced power is not active.

* The ignition is ON or the engine is operating.

* DTC P0120, P0122, P0123, P0220, P0222, P0223, P2135 run continuously when the above conditions are met.

Conditions for Setting the DTC

P0120

TP sensor 1 voltage is less than 0.325 V or greater than 4.75 V for greater than 1 s.

P0122

The ECM detects that the TP sensor 1 voltage is less than 0.325 V for greater than 1 s.

P0123

The ECM detects that the TP sensor 1 voltage is greater than 4.75 V for greater than 1 s.

P0220

The TP sensor 2 voltage is less than 0.25 V or greater than 4.59 V for greater than 1 s.

P0222

The ECM detects that the TP sensor 2 voltage is less than 0.25 V for greater than 1 s.

P0223

The ECM detects that the TP sensor 2 voltage is greater than 4.59 V for greater than 1 s.

P2135

The difference between the TP sensor 1 and TP sensor 2 exceeds a predetermined value for greater than 2 s.

Action Taken When the DTC Sets

* DTC P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.

* The control module commands the TAC system to operate in the Reduced Engine Power mode.

* A message center or an indicator displays Reduced Engine Power.

* Under certain conditions the control module commands the engine OFF.

Conditions for Clearing the MIL/DTC

DTCs P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.

Diagnostic Aids

* If the Throttle Sweep Test is not available on the scan tool, observe the scan tool TP Sensor 1 and 2 Agree/Disagree parameter while

performing the following tests:

- Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times.

- Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the

procedure several times.

The TP Sensor 1 and 2 Agree/Disagree parameter should display Agree. If Disagree is displayed, continue diagnosis in Circuit/System

Testing.

* A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set.