P2176
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) is the control center for the throttle body 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 throttle body (TAC) motor. The throttle body (TAC) motor system uses the following circuits:
* Throttle body motor control 1
* Throttle body motor control 2
Two processors are also used to monitor the throttle body motor system data. Both processors are located within the ECM. Both processors monitor each others data to verify that the indicated throttle position is correct.
Conditions for Running the DTC
P1516 or P2101
* DTC P1682 is not set.
* The engine is running.
* The ECM has learned the minimum throttle position.
* The ignition voltage is greater than 6 volts and reduced power is not active.
* DTCs P1516 and P2101 run continuously when the above conditions are met.
P2119
* DTCs P0121, P0122, P0123, P0222, P0223, P0641, P0651, P0697, P06A3, or P2135 are not set.
* The ignition voltage is greater than 8 V.
* DTC P2119 runs when the ignition is turned to the OFF position, when the above conditions are met.
P2176
* The ignition voltage is greater than 8 V.
* DTC P2176 runs once per ignition cycle when the above conditions are met.
Conditions for Setting the DTC
P1516 and P2101
The ECM detects the difference between the actual throttle position, and the desired position is greater than 7.5% for 30 s.
P2119
The ECM detects that the throttle blade did not return to the default position, during power down, within a calibrated amount of time.
P2176
The ECM detects that both throttle position sensors were greater than 0.95 V during the minimum learn procedure.
Action Taken When the DTC Sets
P1516, P2101, or P2176
* DTCs P1516, P2101, and P2176 are Type A DTCs.
* The ECM commands the TAC system to operate in a reduced engine power mode.
* A message center or an indicator displays Reduced Engine Power.
* Under certain conditions the control module commands the engine OFF.
P2119
DTC P2119 is a Type C DTC.
Conditions for Clearing the DTC
* DTCs P1516, P2101, and P2176 are Type A DTCs.
* DTC P2119 is a Type C DTC.
Diagnostic Aids
* A high resistance condition with the throttle position sensor circuits may cause DTCs P1516, P2101, P2119, or P2176 to set.
* 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.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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, engine OFF, Verify DTC P0121, P0122, P0123, P0222, P0223, P0562, P0563, 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.
2. Verify the scan tool Throttle Body Idle Air Flow Compensation parameter is less than 90%.
• If greater than 90%, refer to Throttle Body Inspection and Cleaning Procedures.
3. 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.
• If the DTC P1516, P2101, P2119, or P2176 are set, refer to Circuit/System Testing.
Circuit/System Testing
1. Inspect the Q38 Throttle Body for the following conditions:
* A throttle blade that is not in the rest position
* A throttle valve that is binding open or closed
* A throttle valve that opens or closes without spring pressure
• If a condition is found, replace the Q38 Throttle Body.
Note:
Disconnecting the throttle body harness connector causes additional DTCs to set.
2. Ignition OFF, disconnect the harness connector of the Q38 Throttle Body.
3. Ignition ON, verify that a test lamp does not illuminate between each motor control circuit listed below and ground.
* Motor control closed circuit terminal A
* Motor control open circuit terminal B
• If the test lamp illuminates, test the control circuits for a short to voltage.
4. Ignition ON, probe the Q38 Throttle Body motor control 1 circuit terminal A and Q38 Throttle Body motor control 2 circuit terminal B with a test lamp connected to B+. Verify the test lamp does not illuminate.
• If the test lamp illuminates, test the appropriate Q38 Throttle Body motor control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
5. Set the DMM to Alternating Current (AC) hz on the 400 mV scale. Engine idling, test for greater than 2000 AC hz between the Q38 Throttle Body motor control circuits listed below and ground while commanding the Engine Speed to 1 950 RPM with a scan tool.
* Motor control closed circuit terminal A
* Motor control open circuit terminal B
• If less than the specified value, replace the K20 Engine Control Module.
6. If all circuits test normal, replace the Q38 Throttle Body.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Throttle Body Assembly Replacement Removal and Replacement
* Control Module References Control Module References for engine control module replacement, programming and setup