GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2005 🢒 Vibe - AWD 🢒 Restraints 🢒 SIR 🢒 DTC P2111

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 powertrain control module (PCM) uses driver input from the accelerator pedal position (APP) sensor in order to calculate the desired throttle position. The PCM 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. If the TP sensor indicates that the throttle valve has failed to reach the target position, a DTC P2111 sets. For additional information on the operation of the TAC system, refer to Throttle Actuator Control (TAC) System Description .

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P2111 Throttle Actuator Control (TAC) Throttle Valve-Stuck Open

Conditions for Running the DTC
    • The duty cycle of the close command for the TAC motor is at least 80 percent.
    • The TAC motor current is more than 2 amps.
    • DTC P2111 runs continuously once the above condition has been met.

Conditions for Setting the DTC

The TP voltage does not change as expected when the throttle valve is commanded CLOSED.

Action Taken When the DTC Sets
    • The PCM illuminates the malfunction indicator lamp (MIL).
    • The PCM stores the conditions that were present when the DTC set as Freeze Frame data.
    • The engine will operate in the reduced power mode and the TP sensor angle will default to 19 percent.

Conditions for Clearing the MIL/DTC
    • The PCM turns OFF the MIL on the third consecutive trip in which the diagnostic runs without a fault.
    • The PCM clears a History DTC after 40 consecutive warm-up cycles without a fault.
    • You use the scan tool Clear DTC Information function.

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. The throttle valve should be open approximately 11-15 percent. 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 Intermittent Conditions .

Test Description

The number below refers to the step number on the diagnostic table.

  1. If there any TAC system related DTCs set, fix those DTCs first.

Step

Action

Yes

No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Are any other throttle actuator control (TAC) system, throttle position (TP) sensor, or accelerator pedal position (APP) sensor DTCs also set?

Go to Diagnostic Trouble Code (DTC) List - Vehicle

Go to Step 3

3
  1. Turn ON the ignition, with the engine OFF.
  2. Clear the DTCs with a scan tool.
  3. Turn OFF the ignition for 30 seconds.
  4. Start the engine.
  5. Move the accelerator pedal from the rest position to the wide open position a couple of times.
  6. Observe the DTC Information with a scan tool.

Did the DTC fail this ignition?

Go to Step 5

Go to Step 4

4
  1. Observe the Freeze Frame/Failure records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure records data.

Did the DTC fail this ignition cycle?

Go to Step 5

Go to Diagnostic Aids

5

  1. Turn OFF the ignition.
  2. Disconnect the air cleaner duct from the throttle body.
  3. Inspect the throttle body bore and the throttle valve for foreign material or an obstruction.
  4. Remove or repair any condition as necessary.
  5. Ensure that the throttle operates freely and without excessive effort.

Did you find and correct the condition?

Go to Step 8

Go to Step 6

6

  1. Inspect the throttle bore and throttle valve for physical damage, binding, misaligned.
  2. Replace the throttle body assembly as necessary. Refer to Throttle Body Assembly Replacement .

Did you find and correct the condition?

Go to Step 8

Go to Step 7

7

Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement .

Did you complete the replacement?

Go to Step 8

--

8
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

Go to Step 2

Go to Step 9

9

Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?

Go to Diagnostic Trouble Code (DTC) List - Vehicle

System OK