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
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The secondary air injection (AIR) 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. An AIR system pressure sensor is used to monitor the air flow from the AIR pump. The Engine Control Module (ECM) supplies 5 V to the 5 V 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 AIR system.
Ignition voltage is supplied directly to the secondary air injection pump relay. The Engine Control Module (ECM) controls the relay by grounding the control circuit, which activates the AIR pump relay. With the relay contacts closed, battery voltage is supplied to the AIR pump.
Conditions for Running the DTC
* DTCs 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 are not set.
* The ignition voltage is between 10-18 V.
* The intake air temperature (IAT) is warmer 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 AIR 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 Views)
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 Air Pump output will vary with system voltage.
1. Ignition ON, observe the DTC information with a scan tool. Verify that DTCs P0412, P0418, P2430, P2431, P2432, P2433, P2440, or P2444 are not set.
• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
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).
• If greater than the specified range, refer to DTC P2430-P2433 (P2430).
4. Command the following relays ON and OFF with a scan tool. You should hear, or feel, the relay click when commanded ON and OFF:
* Air Pump Relay
* Air Solenoid Relay
• If the relay does not respond to the scan tool commands, refer to DTC P0412 or P0418 (P0412).
5. 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.
• If the Air Solenoid does not respond to the scan tool commands, refer to DTC P2440 (P2440).
6. Engine idling, command the Air Pump Relay ON with a scan tool while observing the Air Pressure Sensor parameter. The reading should change greater than 25 kPa (3.6 psi).
7. 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 AIR 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 AIR pump ground circuit, for an open/high resistance. If the circuits test normal, test or replace the Secondary Air Injection Pump.
4. Inspect the AIR system for the following conditions:
* Hoses/pipes for a restriction or blockage
* Hoses/pipes for being disconnected
* Plugged AIR pressure sensor port
* Damaged AIR injection check valve
• If a condition is located, repair as necessary.
• If a condition is not located, and the AIR 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 (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 Pipe Replacement (Service and Repair)
* Secondary Air Injection Pump Replacement (Service and Repair)