P0068
DTC P0068 or P1101
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 Descriptor
DTC P0068
- Throttle Body Air Flow Performance
DTC P1101
- Intake Air Flow System Performance
Circuit/System Description
The engine control module (ECM) compares actual airflow based on throttle position (TP) to a calculated airflow based on manifold absolute pressure (MAP) sensor, and mass air flow (MAF) and when equipped: Turbocharger Boost Pressure sensor.
Conditions for Running the DTC
DTC P0068
* DTC P0102, P0103, P0107, P0108, or P0651 is not set
* The engine speed is at least 800 RPM.
* The Ignition signal is at least 6.0 V.
* The DTC runs continuously when the above conditions are met.
DTC P1101
* DTC P0102, P0103, P0107, P0108, P0117, P0118, P0128, P0335, or P0336 is not set
* The engine speed is between 400-6,000 RPM
* The engine coolant temperature (ECT) is between -7 to +125°C (+19 to +257°F).
* The intake air temperature (IAT) is between -20 to +125°C (-4 to +257°F).
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTCs
The ECM detects that the actual airflow rate is greater than the calculated airflow.
Action Taken When the DTCs Set
* DTC P0068 is a Type A DTC.
* DTC P1101 is a Type B DTC.
Conditions for Clearing the DTCs
* DTC P0068 is a Type A DTC.
* DTC P1101 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left
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.
2. Verify that DTC P0641, P0651, P0697, or P06A3 is not set.
• If any of the DTCs are set
Refer to DTC P0641, P0651, P0697, or P06A3 (ECM) Powertrain Management (ECM) for further diagnosis.
• If none of the DTCs are set
3. Verify the scan tool Throttle Body Idle Air Flow Compensation parameter is less than 90 %.
• If 90 % or greater
Refer to Throttle Body Cleaning Procedures.
• If less than 90 %
4. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool.
• If Disagree
Refer to DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LCV) P0121DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LTG) P0121 for further diagnosis.
• If Agree
5. Determine the current vehicle testing altitude.
6. Verify the scan tool MAP Sensor pressure parameter is within the range specified in the Altitude Versus Barometric Pressure Electrical Specifications table.
• If the MAP Sensor parameter is not in range
Refer to DTC P0106 P0106 for further diagnosis.
• If the MAP Sensor parameter is in range
7. Verify the engine is equipped with a turbocharger.
• If not equipped with a turbocharger.
Refer to Step 10.
• If equipped with a turbocharger.
8. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the Altitude Versus Barometric Pressure Electrical Specifications table.
• If the Boost Pressure Sensor parameter is not in range
Refer to DTC P0236 P0236 for further diagnosis.
• If the Boost Pressure Sensor parameter is within range
9. Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine.
• If the Boost Pressure Sensor parameter does not decrease
Refer to DTC P0236 P0236 for further diagnosis.
• If the Boost Pressure Sensor parameter is within range
10. Engine idling, verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 psi) and changes with accelerator pedal input.
• If not between 26-52 kPa (3.8-7.5 psi) or does not change
Refer to DTC P0106 P0106 for further diagnosis.
• If between 26-52 kPa (3.8-7.5 psi) and changes
11. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below.
1. Engine idling
2. Perform the scan tool snapshot function.
3. Increase the engine speed slowly to 3,000 RPM and then back to idle.
4. Exit from the scan tool snapshot and review the data.
5. Observe the MAF Sensor parameter frame by frame with a scan tool.
• The MAF Sensor parameter does not change smoothly and gradually
Refer to DTC P0101 P0101 for further diagnosis.
• The MAF Sensor parameter changes smoothly and gradually
12. 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.
13. Verify a DTC does not set.
• 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
14. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Control Module References Control Module References for engine control module replacement, programming, and setup