P2110

DTC P2110: Throttle Actuator Control (TAC) System - Forced Limited Engine Speed

Wiring Diagram:

Circuit Description
This DTC detects a faulty throttle valve position. The throttle valve in the throttle body utilizes a throttle return spring to assist in positioning the throttle valve at a resting or default position. The Engine Control Module (ECM) uses driver input from the Accelerator Pedal Position (APP) sensor in order to calculate the desired throttle position. The ECM sends the desired throttle position or target value to the Throttle Actuator Control (TAC) module. The TAC module achieves the desired throttle position by commanding the throttle control motor to position the throttle valve at the target value. The TAC module then compares the Throttle Position (TP) sensor 1 value to the target value. If necessary, the throttle control motor is moved slightly in order to obtain the exact target value position.

Conditions for Setting the DTC
- Ignition ON.
- The TP is jammed in open position.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the time the diagnostic fail. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- The MIL will turn OFF at the end of a consecutive validation cycle in which the diagnostic runs without a fault.
- A history DTC will clear after 40 warm up cycles without a fault.
- DTC(s) can be cleared by using the scan tool.

Diagnostic Aids
- Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore causing the throttle valve not to close. Observe the Freeze Frame/Failure Records.
- 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 or open any more than a specified 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.
- For an intermittent condition, refer to Intermittents. Intermittents

Test Description
The numbers below refer to the step numbers on the diagnostic table.
1. This step determines if the condition exists.
2. Coking on the throttle bore or valve may cause this DTC to set.
3. This step determines if the coking was the cause of the DTC.

Step 1 - 9:

DTC Troubleshooting