P2176
DTC P1516, P2101, P2119, or P2176
DTC Descriptors
DTC P1516
- Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance
DTC P2101
- Throttle Actuator Position Performance
DTC P2119
- Throttle Closed Position Performance
DTC P2176
- Minimum Throttle Position Not Learned
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
Circuit/System Description
The engine control module (ECM) is the control center for the throttle actuator control (TAC) system. The ECM determines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. The TAC system uses the following circuits:
* Motor control 1
* Motor control 2
Two processors are used to monitor the TAC system data. Both processors are located within the ECM. Both processors monitor and share data to verify that the indicated throttle position is correct.
Conditions for Running the DTC
P1516
* DTC P0068 or P0121 is not set.
* The ignition is in the Run or Crank position.
* The ignition voltage is more than 6.5 volts.
* The engine is running, or the system is not in the Battery Save mode if the engine is not running.
* DTC P1516 runs continuously when the above conditions are met.
P2101
* DTC P0068 or P0121 is not set.
* The ignition is in the Run or Crank position.
* The system voltage is more than 11 volts.
* The engine is running or the system is not in Battery Saver mode if the engine is not running.
P2119
* The ignition is in the Unlock/Accessory, Run, or Crank position.
* The ignition voltage is more than 5.23 volts.
* The system is in the Battery Save mode.
* DTC P2119 runs continuously when the above conditions are met.
P2176
* The ignition is in the Run or Crank position.
* DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 is not set.
* The system is in the minimum throttle position (TP) learn state.
* The throttle is stable for more than 40 milliseconds.
* DTC P2176 runs continuously when the above conditions are met.
Conditions for Setting the DTC
P1516
* The indicated throttle position does not match the predicted throttle position for more than 0.5 second.
OR
* The ECM detects a current draw of more than 9 amps on the motor circuits for more than 0.18 second.
P2101
The indicated throttle position does not match the predicted throttle position for more than 0.3 second.
P2119
The ECM detects that the throttle is unable to return to the default position after it is de-energized for more than 0.5 second.
P2176
The ECM detects that the minimum throttle position was not learned for more than 1.8 seconds.
Action Taken When the DTC Sets
* DTCs P1516, P2101, and P2176 are Type A DTCs.
* DTC P2119 is a Type C DTC.
* The control module commands the TAC system to operate in the Reduced Engine Power mode.
Conditions for Clearing the MIL/DTC
* DTCs P1516, P2101, and P2176 are Type A DTCs.
* DTC P2119 is a Type C DTC.
Circuit/System Verification
With the ignition ON, use a scan tool to observe the TP sensor 1 indicated position. Throttle position should increase as pedal is applied and decrease as pedal is released. When no accelerator pedal activity is detected, The throttle position will return to the spring loaded default position.
Circuit/System Testing
1. Inspect the throttle body for the following conditions:
* A throttle blade that is NOT in the rest position
* A throttle blade that is binding open or closed
* A throttle blade that is free to move open or closed WITHOUT spring pressure
2. With the ignition ON, and the throttle body disconnected, measure for voltage between the TAC motor control 1 and 2 circuits and a good ground. The voltage should be 0 volts.
^ If voltage is more than 0 volts, test the affected motor control circuit for a short to voltage. If the circuits test normal, replace the control module.
3. With the ignition ON, and the throttle body disconnected, probe the TAC motor control 1 and 2 circuits with a test lamp connected to B+. The test lamp should not illuminate.
^ If test lamp illuminates, test the affected motor control circuit for a short to ground.
4. Turn OFF the ignition.
5. Connect a DMM between the TAC motor control 1 circuit and ground.
6. Using the 1 ms Peak Min/Max feature, set to the 40 V scale, measure the voltage while turning ON the ignition. The max voltage should be within 0.5 volt of the B+.
^ If the voltage is not within 0.5 volt of B+, test the TAC motor control 1 circuit for an open or high resistance. If the circuits test normal, replace the control module.
7. Turn OFF the ignition.
8. Connect a DMM between the TAC motor control 2 circuit and ground.
9. Using the 1 ms Peak Min/Max feature, set to the 40 V scale, measure the voltage while turning ON the ignition. The max voltage should be within 0.5 volt of the B+.
^ If the voltage is not within 0.5 volt of B+, test the TAC motor control 2 circuit for an open or high resistance. If the circuits test normal, replace the control module.
10. If all circuits test normal, replace the throttle body.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Refer to Programming and Relearning for setup, and Programming. Programming and Relearning
* Throttle Body Assembly Replacement