P2279

DTC P2279

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Strategy Based Diagnosis Strategy Based Diagnosis
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions

DTC Descriptor
DTC P2279
- Intake Manifold Air Leak

Circuit/System Description

The engine control module (ECM) compares actual vacuum reading of the manifold absolute pressure (MAP) sensor at idle to a calculated vacuum reading.

Conditions for Running the DTC

* DTCs P0106, P0107, P0108, P0112, P0113, P0115, P0117, P0118, P0122, P0123, P0125, P0128, P0131, P0132, P0133, P0134, P0135, P0141, P0171, P0172, P0201-P0204, P0217, P0300, P0336, P0337, P0341, P0342, P0351, P0352, P0402, P0404, P0405, P0406, P0488, P0496, P0502, P2195, and P2196 are not set.
* The evaporative emission (EVAP) purge canister commanded state is less than 100 percent.
* The barometric pressure (BARO) is greater than 72 kPa.
* The engine coolant temperature (ECT) is greater than 60°C (140°F).
* The intake air temperature (IAT) sensor is greater than -20°C (-4°F).
* The manifold absolute pressure (MAP) is less than 60 kPa.
* The engine is operating for more than 60 seconds.
* The engine is at idle with the throttle closed.
* The ECM is not commanding an IAC motor reset.
* The following components are not changing states:

- The A/C compressor
- The engine cooling fans
- The automatic transmission

* The DTC runs continuously when the above conditions are met for 5 seconds.

Conditions for Setting the DTC

* The ECM detects that the predicted intake air flow into the engine is not within a predetermined range of the actual air flow into the engine.
* The condition exists for more than 20 seconds.

Action Taken When the DTC Sets

DTC P2279 is a Type B DTC.

Conditions for Clearing the DTC

DTC P2279 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics (w/Throttle Actuator Controls) Electrical DiagramsEngine Controls Schematics (w/o Throttle Actuator Control) Electrical Diagrams

Connector End View Reference
* Engine Control Module Connector End Views (w/ Throttle Actuator Control) Engine Control Module Connector End Views (w/ Throttle Actuator Control)Engine Control Module Connector End Views (w/o Throttle Actuator Control) Engine Control Module Connector End Views (w/o Throttle Actuator Control)
* Engine Controls Connector End Views (w/ Throttle Actuator Control) Engine Controls Connector End Views (w/ Throttle Actuator Control)Engine Controls Connector End Views (w/o Throttle Actuator Control) Engine Controls Connector End Views (w/o Throttle Actuator Control)

Description and Operation

Air Intake System Description Air Intake System

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
* Scan Tool Data List (w/ Throttle Actuator Control) Scan Tool Data List (w/ Throttle Actuator Control)Scan Tool Data List (w/o Throttle Actuator Control) Scan Tool Data List (w/o Throttle Actuator Control)
* Scan Tool Data Definitions (w/ Throttle Actuator Control) Scan Tool Data Definitions (w/ Throttle Actuator Control)Scan Tool Data Definitions (w/o Throttle Actuator Control) Scan Tool Data Definitions (w/o Throttle Actuator Control)
* Scan Tool Output Controls (w/ Throttle Actuator Control) Scan Tool Output Controls (w/ Throttle Actuator Control)Scan Tool Output Controls (w/o Throttle Actuator Control) Scan Tool Output Controls (w/o Throttle Actuator Control)

Circuit/System Verification

1. 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. DTC P2279 should not set.
2. 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
* A damaged throttle body blade or shaft
* Splits, kinks, or improper connections at the vacuum hoses
* An exhaust gas recirculation (EGR) system leak
* Faulty positive crankcase ventilation (PCV) system operation
* Carbon deposits on the throttle blade-Refer to Throttle Body Service Procedures.
* Vacuum leaks at the intake manifold, throttle body, and injector O-rings

2. If all conditions test normal, test the engine for proper camshaft timing. Refer to Timing Belt Replacement Service and Repair.

Repair Instructions

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

* Throttle Body Assembly Replacement Removal and Replacement
* Air Cleaner Assembly Replacement Service and Repair