P0411
DTC P0411
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 P0411
- Secondary Air Injection (AIR) System Incorrect Air Flow Detected
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 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 directly to the secondary air injection pump relay. The ECM controls the relay by grounding the control circuit, which activates the pump relay. When the relay contacts close, battery voltage is supplied to the pump and the pump turns on.
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.
* The ignition voltage is between 10-18 V.
* The Intake Air Temperature (IAT) is greater than -11°C (+12°F).
* 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 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.
* Greater than 60 min has elapsed since the last cold start.
* The secondary air injection system is commanded ON.
* DTC P0411 runs once per trip start up when the above conditions are met for greater than 5 s.
Conditions for Setting the DTC
* The difference between the predicted system pressure and the actual system pressure is greater than 4 kPa (0.6 psi).
* DTC P0411 sets within 22 s when the above condition is met.
Action Taken When the DTC Sets
DTC P0411 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0411 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
Special Tools
J-36169-HD - Fused Jumper
Circuit/System Verification
Note: Verify the battery is fully charged before proceeding with this diagnostic procedure. The secondary air injection pump output will vary with system voltage.
1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0412, P0418, P2430, P2431, P2432, P2433, P2440, or P2444 is not set.
• If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) for further diagnosis.
2. Compare the scan tool BARO pressure parameter to the Altitude Versus Barometric Pressure (Altitude Versus Barometric Pressure) table. The BARO 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.
3. Compare the scan tool Air Pressure Sensor pressure parameter to the BARO reading. The readings should be within 3 kPa (0.4 psi).
4. Command the Air Solenoid ON and OFF with a scan tool. Listen or feel for Air Solenoid operation. The Air Solenoid should respond to the scan tool commands. Repeat as necessary in order to verify Air Solenoid operation.
5. Engine idling, command the Air Pump Relay ON with a scan tool while observing the Air Pressure Sensor parameter. The reading should increase greater than 25 kPa (3.6 psi).
6. 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, remove the Secondary Air Injection Pump Relay.
2. Verify that a test lamp illuminates between the Secondary Air Injection Pump Relay switch B+ circuit terminal 30 and ground.
• If the test lamp does not illuminate, test the ignition circuit for an open/high resistance. If the circuit tests normal and the relay switch ignition circuit fuse is open, test the controlled output circuit terminal 87 for a short to ground. If the circuit tests normal replace the Secondary Air Injection Pump.
3. Connect the J-36169-HD - Fused Jumper with a 40 A fuse between the secondary air injection pump relay switch B+ circuit terminal 30 and the controlled output circuit terminal 87. The Secondary Air Injection Pump should turn ON.
• If the Secondary Air Injection Pump does not activate, test the controlled output circuit, and the secondary air injection pump ground circuit, for an open/high resistance. If the circuits test normal, test or replace the Secondary Air Injection Pump.
4. Inspect the secondary air injection system for the following conditions:
* Hoses/pipes for a restriction or blockage
* Hoses/pipes for being disconnected
* Plugged secondary air injection pressure sensor port
* Damaged secondary air injection injection check valve
• 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.
5. If all circuits test normal, replace the Secondary Air Injection Pump Relay.
Component Testing
1. Ignition OFF, disconnect the Secondary Air Injection Pump Relay.
2. Test for 50-75 ohm between terminals 85 and 86.
• If the resistance is not within the specified range, replace the Secondary Air Injection Pump Relay.
3. Test for infinite resistance between the following terminals:
* 86 and 87
* 86 and 30
* 85 and 87
* 87 and 30
• If not the specified value, replace the Secondary Air Injection Pump Relay.
4. Install a 15 A fused jumper wire between relay terminal 86 and B+. Install a jumper wire between relay terminal 85 and ground. Test for less than 2 ohm between terminals 87 and 30.
• If greater than the specified range, 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))
* 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 Pump Replacement (Service and Repair)