P2105

DTC P2105

Circuit 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. If the ECM detects the incorrect voltage level at the ignition 1 voltage supply circuits, this DTC sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P2105 Throttle Actuator Control (TAC) System - Forced Engine Shut down

Conditions for Running the DTC

* The ECM power down process in the last drive cycle completely finished.
* DTC P2105 runs continuously once the above condition is met.

Conditions for Setting the DTC

The ECM detects the incorrect voltage level at the ignition 1 voltage supply circuits.

Action Taken When the DTC Sets

* The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
* The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

Conditions for Clearing the MIL/DTC

* The control module turns OFF the malfunction indicator lamp (MIL) after 4 consecutive ignition cycles that the diagnostic runs and does not fail.
* A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
* A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
* Clear the MIL and the DTC with a scan tool.

Test Description

Step 1 - Step 9:

Step 10:

The number below refers to the step number on the diagnostic table.
2. This step determines if the condition exists. 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.