2010 Cadillac Truck SRX FWD V6-3.0L Page 1946

2010 Cadillac Truck SRX FWD V6-3.0L Page 1946

6. Ignition OFF, measure the voltage using the DMM Min/Max Recording Mode function on each circuit listed below as the ignition is turned

ON. The Max voltage should be within 1 V of B+.

* Motor control circuit terminal A

* Motor control circuit terminal B

瀚慖f not within the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

7. If all circuits and connections test normal, replace the Q38 throttle body assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.

* Throttle Body Assembly Replacement (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and

Repair/Removal and Replacement)Throttle Body Assembly Replacement (LAU) (See: Powertrain Management/Fuel Delivery and Air

Induction/Throttle Body/Service and Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, programming, and setup

P2105

DTC P2105

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* 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 sensors 1 and

2 to determine the actual throttle valve position.

Conditions for Running the DTC

* The engine speed is greater than 1200 RPM.

* The ECM power down process in the last drive cycle was completely finished.

* DTC P2105 runs continuously when the above condition is met for greater than 5 s.

Conditions for Setting the DTC

* The ECM detects an incorrect voltage level at the internal ignition voltage supply circuits.

OR

* The ECM detects an internal communication error.

* Either condition exists for greater than 5 s.

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.