Diagnostic Instructions
DTC Descriptors
DTC P2104: Throttle Actuator Control (TAC) System - Forced Engine Idle
DTC P2105: Throttle Actuator Control (TAC) System - Forced Engine Shutdown
DTC P2106: Throttle Control System Performance - Throttle Limitation Active
DTC P2110: Throttle Actuator Control (TAC) System - Forced Limited Engine Speed
Circuit/System Description
DTC P2104, P2105, P2106, and P2110 indicate that a throttle actuator control (TAC) DTC is set that causes the engine control module (ECM) to command one of the following Reduced Power modes:
Conditions for Running the DTC
The ignition is ON or the engine is operating.
Conditions for Setting the DTC
A failure with the TAC system is present.
Action Taken When the DTC Sets
DTC P2104, P2106, and P2110
• | DTC P2104, P2106, and P2110 are Type A DTCs. |
• | The ECM commands the TAC system to operate in a Reduced Engine Power mode. |
DTC P2105
• | DTC P2105 is a Type B DTC. |
• | Engine operation will be disabled. |
Conditions for Clearing the DTC
• | DTC P2104, P2106, and P2110 are Type A DTCs. |
• | DTC P2105 is a Type B DTC. |
Circuit/System Verification
Important:
• | In extreme cold weather conditions ice may form in the vacuum source to the MAP sensor and may set a DTC. Inspect the MAP sensor and the vacuum source for ice, moisture, or other restrictions. |
- Ignition ON, observe the scan tool MAP sensor data parameter. Engine running, verify the scan tool MAP sensor data parameter changes.
- Verify no vacuum leak exists.
⇒ | If a vacuum does exist, repair as necessary. |
- Observe the DTC information with a scan tool. DTCs P2104, P2105, P2106, and P2110 should not set.
- 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.