P2440
DTC P2440
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 (AIR) System Shut-Off Valve Stuck Open
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 5 s.
Conditions for Setting the DTC
The ECM detects that the Secondary Air System pressure is less than expected for greater than 8 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 ([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 or feel a click as the relay is commanded ON and OFF.
3. Command the AIR Solenoid ON and OFF with a scan tool. Listen or 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. 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 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 ohm between the low reference 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 Secondary Air Injection Solenoid Valve ignition voltage circuit terminal 5 and ground.
4. Ignition ON, command the AIR Solenoid ON and OFF 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. Disconnect the air intake hose/pipe from the Secondary Air Injection Solenoid Valve.
6. Ignition ON, command the AIR 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:
* Hoses/pipes for a restriction or blockage
* Hoses/pipes for being disconnected
* The Secondary Air Injection Pump ground circuit for high resistance
* The Secondary Air Injection Pump ignition voltage circuit for high resistance
• If a condition is located, repair as necessary.
• If a condition is not located, and the Secondary Air Injection Pump operates with no pressure change, replace the Secondary Air Injection Pump.
7. If all circuits test normal, test or replace the Secondary Air Injection Solenoid Valve.
Component Testing
1. Ignition OFF, disconnect the harness connector at the Secondary Air Injection Solenoid Valve.
2. Test for 10-15 ohm between terminals 4 and 5.
• If not within the specified range, replace the Secondary Air Injection Solenoid Valve.
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))
* Secondary Air Injection Pipe Replacement (Secondary Air Injection Pipe Replacement)
* Secondary Air Injection Pump Hose Replacement (Secondary Air Injection Pump Hose Replacement)
* Secondary Air Injection Check Valve Replacement (Secondary Air Injection Check Valve Replacement)
* Secondary Air Injection Pump Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for Engine Control Module replacement, setup, and programming