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 System Pump Stuck ON
Diagnostic Fault Information
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 injection solenoid valve relay. The Engine Control Module (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 a voltage condition.
Conditions for Running the DTC
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0114, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0300, P0301, P0302, P0303, P0304, P0351, P0352, P0353, P0354, P0411, P0412, P0418, P0420, P0606, P0641, P0651, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2430, P2431, P2432 or P2433 are not set.
* Greater than 60 min has elapsed since the last cold start.
* The ignition voltage is between 10-32 V.
* The barometric pressure (BARO) is greater than 60 kPa (8.7 psi).
* The engine coolant temperature (ECT) is between -11 to +60°C (12-140°F).
* The intake air temperature (IAT) is warmer than -11°C (+12°F).
* 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 AIR system is commanded ON.
* The DTC runs continuously once the above conditions are met for greater than 4 s.
Conditions for Setting the DTC
The ECM detects that the Secondary Air System pressure is greater than expected for greater than 2 s.
Action Taken When the DTC Sets
DTC P2444 is a Type B DTC.
Conditions for Clearing the DTC
DTC P2444 is a Type B 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 BARO pressure parameter to the Altitude Versus Barometric Pressure (Altitude Versus Barometric Pressure) table. The BARO pressure should be within the specified range displayed in the table for the specific altitude.
• If not within the specified range, refer to DTC P0106 (P0106) for further diagnosis
2. Ignition ON, compare the scan tool Secondary Air Pressure Sensor pressure parameter to the BARO reading. The readings should be within 3 kPa (0.4 psi).
• If greater than the specified range, refer to DTC P2430-P2433 (P2430).
3. Command the Secondary Air Injection Pump Relay ON and OFF with a scan tool. You should hear an audible click as the relay is commanded ON and OFF.
• If the relay does not respond to the scan tool commands, refer to DTC P0412 or P0418 (P0412) for further diagnosis.
4. Ignition ON, command the Secondary Air Injection Pump Relay ON and OFF with a scan tool. The Secondary Air 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 G21 Secondary Air Injection Pump.
2. Ignition ON, verify that a test lamp does not illuminate between the G21 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 (Attached to Wire Harness) (Relay Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (Relay Replacement (Within an Electrical Center))