P2119
DTC P1516, P2101, P2119, or P2176
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
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
Circuit/System 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.
Conditions for Running the DTC
P1516 or P2101
* DTC P0606 and P1682 is not set.
* The run/crank or powertrain relay voltage is greater than 6.0 V and reduced power is not active.
* The engine is running or the following conditions are met:
- The engine is not running.
- The ignition voltage is greater than 11 V.
- The TAC system is not in the Battery Saver mode.
- The ECM is commanding the throttle.
- The ECM has learned the minimum throttle position.
* The DTCs run continuously when the above conditions are met.
P2119
* The ignition is ON.
* The run/crank or powertrain relay voltage is greater than 6.0 V and reduced power is not active.
* DTC P2119 runs continuously when the above conditions are met.
P2176
* DTCs P0120, P0121, P0122, P0123, P0220, P0222, P0223, or P1682 is not set.
* The ignition is ON.
* The run/crank or powertrain relay voltage is greater than 6.0 V and reduced power is not active.
* The ECM enable the minimum throttle learn procedure.
* DTC P2176 run continuously when the above conditions are met.
Conditions for Setting the DTC
P1516
The ECM detects the actual throttle position does not match the predicted throttle position for greater than 1 s.
P2101
The ECM detects the actual throttle position does not match the predicted throttle position for greater than 1 s.
P2119
The ECM detects the throttle blade did not return to the default position when the TAC motor is de-energized for greater than 1 s.
P2176
The ECM detects that both throttle position (TP) sensors were greater than a predetermined voltage during the minimum throttle learn procedure for greater than 2 s.
Action Taken When the DTC Sets
P1516, P2101, and P2176
* 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.
* A message center or an indicator displays Reduced Engine Power.
* Under certain conditions, the control module commands the engine OFF.
Conditions for Clearing the MIL/DTC
* DTCs P1516, P2101, and P2176 are Type A DTCs.
* DTC P2119 is a Type C DTC.
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.
* A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set.
* A low battery condition may cause a DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics (LE9) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left (DH6)
Description and Operation
Throttle Actuator Control (TAC) System Description Throttle Actuator Control (TAC) System Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
Note: A low battery voltage or charging system condition may cause a DTC to set.
2. Verify DTC P0121, P0122, P0123, P0222, P0223, P0562, P0621, P0622, or P2135 is not set.
• If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
• If none of the DTCs are set
3. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %.
• 90 % or greater
Refer to Throttle Body Cleaning Procedures.
• If less than 90 %
4. Clear the DTCs with a scan tool.
5. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
6. Ignition ON.
7. Verify the scan tool TAC Motor parameter displays Enabled.
• If Disabled
Refer to Circuit/System Testing
• If Enabled
8. Verify DTC P1516, P2101, P2119, or P2176 is not set.
• If any of the DTCs are set
Refer to Circuit/System Testing
• If none of the DTCs are set
Note: If there is a condition with the throttle body, the TAC Motor Command parameter will go to 99 % for a predetermined amount of time and then a DTC sets. Once a DTC is set, the TAC Motor Command parameter will go to 0 % and the TAC Motor parameter will display Disabled.
9. Verify the scan tool TAC Motor parameter displays Enabled while performing the Throttle Sweep Test with a scan tool.
• If Disabled
Note: Before replacing the throttle body assembly, make sure the TAC motor control circuits are not shorted to B+.
Test or replace the Q38 throttle body assembly.
• If Enabled
10. 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.
11. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing
• If the DTC does not set
12. All OK
Circuit/System Testing
1. Ignition OFF.
Warning
Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.
2. Verify the conditions listed below do not exist with the Q38 throttle body assembly:
* 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
• If a condition is found
Test or replace the Q38 throttle body assembly.
• If a condition is not found
3. Ignition OFF.
Note: Disconnecting the throttle body harness connector may cause additional DTCs to set.
4. Disconnect the harness connector at the Q38 throttle body assembly, ignition ON.
5. Verify that a test lamp does not illuminate continuously between each motor control circuit listed below and ground.
* TAC Motor Control Closed circuit terminal A
* TAC Motor Control Open circuit terminal B
• If the test lamp illuminates continuously
1. Ignition OFF, disconnect the harness connector at the K20 engine control module, ignition ON
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If the test lamp is always OFF
6. Verify that a test lamp does not illuminate between each motor control circuit listed below and B+.
* TAC Motor Control Closed circuit terminal A
* TAC Motor Control Open circuit terminal B
• If the test lamp illuminates
1. Ignition OFF, disconnect the harness connector at the K20 engine control module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K20 engine control module.
• If the test lamp is always OFF
7. Ignition OFF, set the DMM to the 40 V scale or higher, select the Min/Max Recording Mode, and set the Peak Min/Max response time to 1 ms or faster.
Note:
* The DMM Min/Max Recording Mode and the response time of 1 ms or faster must be reset after testing each circuit or a lower voltage will be recorded.
* The ignition must be OFF and the ECM completely powered down before testing each circuit or a lower voltage will be recorded.
8. Verify the Max voltage is within 3 V of B+ while using DMM Min/Max Recording Mode function on each control circuit listed below as the ignition is turned ON.
* TAC Motor Control Closed circuit terminal A
* TAC Motor Control Open circuit terminal B
• If not within 3 V of B+
1. Ignition OFF, disconnect the harness connector at the K20 engine control module.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 engine control module.
• If within 3 V of B+
9. Test or replace the Q38 throttle body assembly.
Repair Instructions
* Throttle Body Assembly Replacement Removal and Replacement
* Control Module References Control Module References for engine control module replacement, programming, and setup
Repair Verification
1. Ignition OFF.
2. Install any components that have been removed or replaced during diagnosis.
3. Perform any adjustments, programming or setup procedures that are required when a component is removed or replaced.
4. Ignition ON.
5. Clear the DTCs with a scan tool.
6. Turn the ignition OFF for 60 s.
7. Ignition ON.
8. Verify the scan tool TAC Motor parameter displays Enabled while performing the Throttle Sweep Test with a scan tool.
• If Disabled
Test or replace the Q38 throttle body assembly.
• If Enabled
9. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset.
• If any DTC sets
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
• If no DTCs set
10. All OK