P2444

DTC P2444

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 P2444
- Secondary Air Injection (AIR) System Pump Stuck ON

Circuit/System Description

The secondary air injection system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. Ignition voltage is supplied directly to the secondary air injection pump relay and secondary air solenoid valve relay. The ECM controls the relays by grounding the control circuit with a solid state device called a driver. The ECM monitors the control circuits for open, short to ground or short to voltage conditions.

Conditions for Running the DTC

* DTC P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0201, P0202, P0203, P0204, P0300, P0351, P0352, P0353, P0354, P0411, P0412, P0418, P0420, P0601, P0602, P0603, P0604, P0606, P0607, P062F, P0641, P0651, or P2101 is not set.
* Greater than 60 min has elapsed since the last cold start.
* The Barometric Pressure (BARO) is greater than 60 kPa (8.7 psi).
* The Intake Air Temperature (IAT) is warmer than -11°C (12°F).
* The Engine Coolant Temperature (ECT) is between -11 to +60°C (12-140°F).
* The ignition voltage is between 10-18 V.
* The Manifold Absolute Pressure (MAP) sensor is greater than 20 kPa (2.9 psi).
* The engine speed is less than 5,000 RPM.
* The Mass Air Flow (MAF) is less than 50 g/s.
* The secondary air injection system is commanded ON.
* The DTC runs continuously once the above conditions are met for greater than 2 s.

Conditions for Setting the DTC

The ECM detects that the Secondary Air System pressure is greater than expected for greater than 5 s.

Action Taken When the DTC Sets

DTC P2444 is a Type A DTC.

Conditions for Clearing the DTC

DTC P2444 is a Type A DTC.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Secondary Air Injection System Description (Description and Operation)
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 (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, compare the scan tool AIR Pressure Sensor pressure parameter to the BARO reading. The readings should be within 3 kPa (0.4 psi).
2. Command the AIR Pump Relay ON and OFF with a scan tool. You should hear and feel a click as the relay is commanded ON and OFF.
3. Command the AIR Solenoid ON and OFF with a scan tool. Listen and feel for Secondary Air Injection Solenoid Valve operation. The solenoid valve should respond to the scan tool commands. Repeat as necessary in order to verify solenoid valve operation.
4. Ignition ON, command the AIR Pump Relay ON and OFF with a scan tool. The Secondary Air Injection Pump should respond to the scan tool commands.
5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the Secondary Air Injection Pump.
2. Ignition ON, verify that a test lamp does not illuminate between the Secondary Air Injection Pump ignition voltage circuit terminal A and ground.

• If the test lamp illuminates, test the ignition circuit for a short to voltage.

3. If the circuit tests normal replace the Secondary Air Injection Pump relay.

Repair Instructions

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

Relay Replacement (Relay Replacement (Within an Electrical Center))