P0068

DTC P0068

DTC DESCRIPTOR

DTC P0068
Throttle Body Airflow Performance

DIAGNOSTIC FAULT INFORMATION
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
The engine control module (ECM) compares actual airflow based on throttle position (TP) and manifold absolute pressure (MAP) sensor to a calculated airflow.

CONDITIONS FOR RUNNING THE DTC
- The engine is running.
- DTCs P0106, P0107, P0108, P0110, P0111, and P0112 are not set.
- The DTC runs continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
The ECM detects that the actual airflow rate is more than the calculated airflow.

ACTION TAKEN WHEN THE DTC SETS
DTC P0068 is a Type A DTC.

CONDITIONS FOR CLEARING THE DTC
DTC P0068 is a Type A DTC.

CIRCUIT/SYSTEM VERIFICATION
1. Ignition ON, observe the MAP sensor pressure parameter and compare the reading on the scan tool to the barometric pressure table. Refer to Altitude vs Barometric Pressure.
- If the MAP sensor pressure is not within the range specified for your altitude, refer to DTC P0107 or P0108. P0107 P0108
2. Start the engine, observe the MAP Sensor parameter. The reading should be between 32-42 kPa.
3. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

CIRCUIT/SYSTEM TESTING
1. Verify that none of the following conditions exist:
- The air intake duct system for loose connecting clamps, cracks, or other damage
- The air intake duct system for being collapsed or restricted possibly by a restricted air filter
- 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 - Exhaust System. Symptom Related Diagnostic Procedures
- Vacuum leaks at the intake manifold, throttle body, and injector O-rings
2. If all conditions test normal, test the engine for a mechanical condition. Refer to Symptoms - Engine. Symptom Related Diagnostic Procedures

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests