2010 Cadillac CTS Sedan AWD V6-3.0L Page 1825
* 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 P2105
- Throttle Actuator Control (TAC) System - Forced Engine Shutdown
Circuit/System Description
The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control
(TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position (TP) sensors 1
and 2 to determine the actual throttle valve position.
Conditions for Running the DTC
* The ECM power down process in the last drive cycle was completely finished.
* DTC P2105 runs continuously once the above condition is met for greater than 5 seconds.
Conditions for Setting the DTC
* The ECM detects an incorrect voltage level at the ignition voltage supply circuits.
OR
* The ECM detects an internal communication error.
* The condition exists, then a 5 second delay for MIL ON.
Action Taken When the DTC Sets
DTC P2105 is a Type A DTC.
Conditions for Clearing the DTC
DTC P2105 is a Type A DTC.
Diagnostic Aids
* If DTC P2105 sets, the engine will stall and not restart until the ignition is cycled OFF and then ON.
* Additional DTCs set when P2105 sets.
* The ignition key will not be able to be removed from the ignition switch until another ignition cycle occurs.
Reference Information
Schematic Reference
Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Engine Control Module Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Engine Control
Module Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
