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DTC P2105

DTC P2105

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• 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.

• 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

Connector End View Reference

Component Connector End Views

Description and Operation

Throttle Actuator Control (TAC) System Description

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Start the engine. Rapidly move the accelerator pedal from the rest position, to wide open throttle position, back to the rest position. Repeat the procedure a few times. The DTC P2105 should not be set.

2. 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


1. Ignition OFF, remove the fuse that supplies voltage to terminal 5 X2 of the K20 engine control module. Verify the fuse is OK.

2.
Note

This DTC will only set if the fuse is open and the circuits are not grounded. The ignition voltage circuits must be tested thoroughly for an intermittent short to ground.


If the fuse is open, test the ignition voltage circuit between the open fuse and the K20 engine control module terminal 5 X2 for an intermittent short to ground.

3. Install the fuse.

4. Disconnect the harness connectors of the K20 engine control module.

5. Ignition ON, load test for B+ on the ignition circuit terminal 5 X2 of the K20 engine control module connector.

6. If less than B+, repair the ignition circuit for an open/high resistance.

7. If all circuits/connections test OK, replace the K20 engine control module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Engine Control Module replacement, setup, and programming