2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1766

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1766

* DTC P1551 runs when the conditions above have been met for greater than 5 seconds.

Conditions for Setting the DTC

* The ECM detects the TP sensor angle is less than 2 percent or greater than 13 percent when the throttle actuator control motor is deactivated.

* The condition exists for greater than 1 second or for a cumulative of 10 seconds.

Action Taken When the DTC Sets

DTC P1551 is a type A DTC.

Conditions for Clearing the DTC

DTC P1551 is a type A DTC.

Diagnostic Aids

* The scan tool has the ability to operate the throttle actuator control system using Special Functions. This function operates the throttle

through the entire range in order to determine if the throttle body and system operate correctly.

* Inspect for a condition in which the throttle valve may have been held open.

* Inspect for conditions in which ice may have formed in the throttle bore.

* The throttle valve is spring loaded to a slightly open position. This is referred to as the rest position. The throttle valve should not be

completely closed, nor should it be open any greater than predetermined amount. The throttle valve should move open and to the closed

position without binding under the normal spring pressure. The throttle should NOT be free to move open or closed WITHOUT spring

pressure.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (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/Connector End Views By Name)

Description and Operation

Throttle Actuator Control (TAC) System Description (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Throttle Actuator Control (TAC) System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/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

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0121, P0122, P0123, P0221, P0222, P0223, P2100, P2101, or

P2119 is not set.

瀚慖f a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble

Code (DTC) List - Vehicle) for further diagnosis.

2. Start the engine. Observe the DTC information with a scan tool for 30 seconds. DTC P1551 should not set.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing