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).

DTC P0068

DTC P1101

The ECM detects that the actual airflow rate is greater than the calculated airflow.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Verify none of the following conditions exist:

•	The air intake duct system for loose clamps, cracks, or other damage

•	The air intake duct system for being collapsed or restricted

•	The mass airflow sensor is installed correctly. The arrow indicates direction of airflow and the tabs of the hoses and notches of the sensor must be aligned. Refer to Mass Airflow Sensor with Intake Air Temperature Sensor Replacement.

•	Restricted air filter

•	Throttle body for dirt, debris, and coking

•	A damaged throttle body blade or shaft

•	Splits, kinks, or improper connections at the vacuum hoses

•	Missing, restricted, or leaking exhaust components--Refer to Symptoms - Engine Exhaust.

•	Vacuum leaks at the intake manifold, throttle body, and injector O-rings

⇒	If a condition exists, repair as necessary.

2. Ignition ON, observe the diagnostic trouble code (DTC) information with a scan tool. Verify that DTCs P0641, P0651, P0697, or P06A3 are not set.

⇒	If any of the above DTCs are set, refer to DTC P0641, P0651, P0697, or P06A3 for further diagnosis.

3. Determine the current vehicle testing altitude. Compare the MAP sensor pressure parameter to the reading in the Altitude Versus Barometric Pressure table. The MAP sensor pressure parameter should be within the specified range indicated in the table.

⇒	If the MAP sensor pressure is not within the range specified for your altitude, refer to DTC P0106.

4. Engine idling, observe the MAP Sensor parameter. The reading should be between 26-52 kPa.

⇒	If not within the specified range, refer to DTC P0106.

5. Use the scan tool snapshot function to take a snapshot of the engine data list while performing the actions listed below.

5.1.	Engine idling

5.2.	Increase the engine speed slowly to 3,000 RPM and then back to idle.

5.3.	Exit from the scan tool snapshot and review the data.

5.4.	Observe the mass air flow (MAF) sensor parameter frame by frame with a scan tool. The MAF sensor g/s parameter should change smoothly and gradually as the engine speed is increased and then returned to idle.

⇒	If the MAF sensor g/s does not change smoothly and gradually, refer to DTC P0101 for further diagnosis.

6. If all conditions test normal, test the engine for a mechanical condition. Refer to Symptoms - Engine Mechanical.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.