Powertrain Management (LEA)
DTC P2440 (LEA)
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 P2440
-
Secondary Air Injection System Shut-Off Valve Stuck Open
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. A pressure sensor is used to monitor the air flow from the secondary air injection pump. The engine control module (ECM) supplies voltage to the 5-volt reference circuit and supplies a ground to the low reference circuit. The sensor provides a signal voltage to the ECM relative to the pressure changes within the secondary air injection system.
Ignition voltage is supplied to the secondary air injection pump and air injection solenoid valve relays. The ECM controls the relays by grounding the control circuits, which activates the relays. When the relay contacts close, voltage is supplied to the pump and the solenoid valve, which turns the pump on and opens the solenoid valve.
The diagnostic uses 3 phases to test the secondary air injection system as follows:
* DTCs P0411 and P2430 run during Phase 1
* DTCs P2430 and P2440 run during Phase 2
* DTC P2444 runs during Phase 3
During phase 1, both the secondary air injection pump and the secondary air injection solenoid valve are activated. Normal secondary air function occurs. Expected system pressure is 8-15 kPa (1.2-2.2 psi) above BARO.
During phase 2, only the secondary air injection pump is activated. The solenoid valve is closed. Pressure sensor performance and solenoid valve deactivation are tested. Expected system pressure is 15-22 kPa (2.2-3.2 psi) above BARO.
During phase 3, neither the secondary air injection pump nor the secondary air injection solenoid valve is activated. secondary air injection pump deactivation is tested. Expected system pressure equals BARO.
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 30 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 greater than -11°C (+12°F).
* The manifold absolute pressure (MAP) sensor is greater than 20 kPa (2.9 psi).
* The mass air flow (MAF) is less than 50 g/s.
* The engine speed is less than 5,000 RPM.
* The secondary air injection system is commanded ON.
* The DTC runs continuously once the above conditions are met for greater than 3 s.
Conditions for Setting the DTC
The ECM detects that the secondary air system pressure is less than a calibrated threshold for greater than 1.5 s.
Action Taken When the DTC Sets
DTC P2440 is a Type B DTC.
Conditions for Clearing the DTC
DTC P2440 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics (LEA) [1][2]Electrical DiagramsEngine Controls Schematics (LUK) [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 P2227-P2230 P2227 for further diagnosis.
2. Compare the scan tool Secondary Air Injection Pressure Sensor pressure parameter to the BARO reading. The readings should be within 3 kPa (0.4 psi).
• If not within the specified range, refer to DTC P2430-P2433 (LEA) Powertrain Management (LEA)DTC P2430-P2433 (LAF, LUK) Powertrain Management (LAF, LUK).
3. Command the Secondary Air Injection Solenoid Valve Open and Closed with a scan tool. Listen and feel for Solenoid Valve operation. The Solenoid Valve should respond to the scan tool commands. Repeat as necessary in order to verify Air Solenoid Valve operation.
4. 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 Q29 Secondary Air Injection Solenoid Valve.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the ground circuit terminal 4 and ground.
• If greater than the specified range, repair the ground circuit for an open/high resistance.
3. Connect a test lamp between the Q29 Secondary Air Injection Solenoid Valve ignition voltage circuit terminal 5 and ground.
4. Ignition ON, command the Secondary Air Injection Solenoid Valve Open and Closed with a scan tool. The test lamp should respond to the scan tool commands.
• If the test lamp is always OFF, test the ignition circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the Secondary Air Injection Solenoid Valve relay.
• If the test lamp is always ON, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the Secondary Air Injection Solenoid Valve relay.
5. Ignition OFF, remove the Q29 Secondary Air Injection Solenoid Valve.
6. Connect the Q29 Secondary Air Injection Solenoid Valve harness connector.
7. Ignition ON, command the Secondary Air Injection Solenoid Valve Open and Closed with a scan tool while observing the check valve assembly. The valve should open and close in response to the scan tool commands.
• If the valve does not operate as specified, replace the Q29 Secondary Air Injection Solenoid Valve.
8. Disconnect the Secondary Air Injection Pump hose/pipe from the Q29 Secondary Air Injection Solenoid Valve.
9. Ignition ON, command the Secondary Air Injection Pump ON with a scan tool. Verify airflow to the Secondary Air Injection Solenoid Valve.
• If there is limited or no airflow to the Secondary Air Injection Solenoid Valve, inspect for the following:
* All Secondary Air Injection system Hoses/pipes for a restriction or blockage
* Secondary Air Injection Pump Hose/pipe for leaks or loose connections
• If a condition is located, repair or replace the affected component as necessary.
10. If all circuits and hoses/pipes test normal, test or replace the Q29 Secondary Air Injection Solenoid Valve.
Component Testing
1. Ignition OFF, disconnect the harness connector at the Q29 Secondary Air Injection Solenoid Valve.
2. Test for 5-15 ohms between the Q29 Secondary Air Injection Solenoid Valve terminals 4 and 5.
• If not within the specified range, replace the Q29 Secondary Air Injection Solenoid Valve.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Secondary Air Injection Check Valve Replacement Secondary Air Injection Check Valve Replacement
* Secondary Air Injection Pipe Replacement Secondary Air Injection Pipe Replacement
* Secondary Air Injection Pump Replacement Service and Repair
* Secondary Air Injection Pump Inlet Hose Replacement Secondary Air Injection Pump Inlet Hose Replacement
* Control Module References Programming and Relearning for Engine Control Module replacement, setup, and programming