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 in each bank 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 circuits and supplies a ground to the low reference circuits. The sensors provide 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 shutoff/check 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 valves, which turns the pump on and opens the valves.
The diagnostic uses 3 phases to test the secondary air injection system:
* DTCs P0411, P2430 and P2435 run during Phase 1
* DTCs P2430, P2435 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 shutoff and check valves are activated. Normal secondary air function occurs. Expected system pressure is 5-11 kPa (0.7-1.6 psi) above BARO. Relatively high magnitude of pressure pulses are expected due to exhaust pulses. Low magnitude pressure pulses indicate a blockage or disconnect downstream of the valve.
During phase 2, only the secondary air injection pump is activated. The shutoff and check valves are closed. Pressure sensor performance and shutoff and check valve deactivation are tested. Expected system pressure is 14-22 kPa (2.0-3.2 psi) above BARO.
During phase 3, neither the secondary air injection pump nor the secondary air injection shutoff and check valves are activated. Secondary air injection pump deactivation is tested. Expected system pressure equals BARO.
Conditions for Running the DTC
* DTC P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0128, P0201-P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0300, P0351, P0352, P0353, P0354, P0355, P0356, P0412, P0418, P0420, P0430, P0606, P0641, P0651, P124A, P124B, P124C, P124D, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, P2227, P2228, P2229, P2230, P2430, P2431, P2432, P2433, P2435, P2436, P2437, or P2438 is not set.
* Greater than 60 min has elapsed since the last cold start.
* The ignition voltage is between 10-32 V.
* The engine speed is less than 5,000 RPM.
* The intake air temperature (IAT) is greater than -10°C (+14°F).
* The engine coolant temperature (ECT) is between -10 and +56°C (14-133°F).
* The barometric pressure (BARO) is greater than 74 kPa (10.7 psi).
* 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 secondary air injection pump is commanded ON.
* DTC P0411 runs once per ignition cycle when the above conditions are met for greater than 7 s.
Conditions for Setting the DTC
* The actual system pressure in either bank is at least 7 kPa (1.0 psi) greater or 7 kPa (1.0 psi) less than the predicted system pressure for greater than 7 s.
OR
* The difference between the predicted magnitude of pressure pulsations and the actual magnitude of pressure pulsations, in either bank over a specific length of time, exceeds a calibrated threshold.
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.
Diagnostic Aids
Ice buildup due to condensation/water in the air passages or pump may cause this DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
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 Control Module References 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
2. Verify that DTC P0412, P0418, P2430, P2431, P2432, P2433, P2235, P2236, P2237, P2238, P2440, or P2444 is not set.
• If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
• If none of the DTCs are set.
3. Verify the scan tool BARO pressure parameter is within the range specified in the Altitude Versus Barometric Pressure Altitude Versus Barometric Pressure table.
• If not within the specified range
Refer to DTC P2227-P2230 P2227 for further diagnosis.
• If within the specified range
Note: Engine coolant temperature must be greater than 5°C (41°F) to enable scan tool device control. Repeat multiple times to verify secondary air injection shutoff and check valve operation.
4. Verify the secondary air injection shutoff and check valves turn ON and OFF when commanding the AIR Solenoid ON and OFF with a scan tool.
• If the secondary air injection shutoff and check valves do not operate as specified
Refer to Circuit/System Testing-Secondary Air Injection Shutoff and Check Valve Malfunction
• If the secondary air injection shutoff and check valves operate as specified
Note: To prevent the secondary air injection pump from overheating, do not operate the pump consecutively for greater than 2 minutes. The pump is provided with a thermal protector that will automatically reset when allowed to cool.
5. Verify the secondary air injection pump turns ON and OFF when commanding the AIR Pump Relay ON and OFF with a scan tool.
• If the secondary air injection pump does not operate as specified
Refer to Circuit/System Testing-Secondary Air Injection Pump Malfunction
• If the secondary air injection pump operates as specified
6. Verify the scan tool AIR Pressure Sensor in each bank and the BARO pressure parameters are within 3 kPa (0.4 psi).
• If not within the specified range
Refer to Circuit/System Testing-Secondary Air Injection System Pressure Not In Range.
• If within the specified range
7. Engine running
8. Verify the scan tool AIR Press Sens Bn 1 and Bn 2 parameters increase between 14-22 kPa (2.0-3.2 psi), greater than BARO, when the AIR Pump Relay is commanded ON with a scan tool.
• If not within the specified range
Refer to Circuit/System Testing-Secondary Air Injection System Pressure Not In Range.
• If within the specified range
9. Verify the scan tool AIR Press Sens Bn 1 and Bn 2 parameters increase between 5-11 kPa (0.7-1.6 psi), greater than BARO, when the AIR System is commanded ON with a scan tool.
• If not within the specified range
Refer to Circuit/System Testing-Secondary Air Injection System Pressure Not In Range.
• If within the specified range
10. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
11. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Verification-step 1.
• If the DTC does not set
12. All OK.
Circuit/System Testing
Secondary Air Injection Shutoff and Check Valve Malfunction
1. Ignition OFF, disconnect the KR26 secondary air injection solenoid valve relay.
2. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Disconnect the harness connector at the appropriate Q29 secondary air injection solenoid valve.
4. Test for infinite resistance between the control circuit terminal 5 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
5. Test or replace the Q29 secondary air injection solenoid valve.
• If the test lamp illuminates
3. Disconnect the harness connector at the appropriate Q29 secondary air injection solenoid valve.
4. 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 10 ohms between the Q29 secondary air injection solenoid valve ground circuit terminal 4 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
5. Connect the harness connector at the Q29 secondary air injection solenoid valve.
6. Connect a 15 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
7. Verify the Q29 secondary air injection solenoid valves are activated.
• If a Q29 secondary air injection solenoid valve does not activate
1. Ignition OFF, disconnect the harness connector at the appropriate Q29 secondary air injection solenoid valve.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, test or replace the Q29 secondary air injection solenoid valve.
• If the Q29 secondary air injection solenoid valves activate
8. Test or replace the KR26 secondary air injection solenoid valve relay.
Secondary AIR Injection Pump Malfunction
1. Ignition OFF, disconnect the KR25 secondary air injection pump relay.
2. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF
2. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Disconnect the harness connector at the G21 secondary air injection pump.
4. Test for infinite resistance between the control circuit terminal A and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
5. Test or replace the G21 secondary air injection pump.
• If the test lamp illuminates
3. Disconnect the harness connector at the G21 secondary air injection pump.
4. 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 10 ohms between the G21 secondary air injection pump ground circuit terminal B and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
5. Connect the harness connector at the G21 secondary air injection pump.
6. Connect a 60 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
Note: To prevent the secondary air injection pump from overheating, do not operate the pump consecutively for greater than 2 minutes. The pump is provided with a thermal protector that will automatically reset when allowed to cool.
7. Verify the G21 secondary air injection pump is activated.
• If the G21 secondary air injection pump does not activate
1. Ignition OFF, disconnect the harness connector at the G21 secondary air injection pump.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms,
3. Test or replace the G21 secondary air injection pump.
• If the G21 secondary air injection pump activates
8. Test or replace the KR25 secondary air injection pump relay.
Secondary Air Injection System Pressure Not In Range
1. Verify the following conditions do not exist:
* Hoses/pipes restricted or blocked
* Hoses/pipes leaking or disconnected
* Plugged secondary air injection pressure sensor port (integral to shutoff and check valve)
* Damaged secondary air injection shutoff and check valve
* Restricted or blocked cylinder head secondary air injection inlet ports and passages
• If a condition is located
Repair or replace the affected component as necessary.
• If all components test normal
2. Disconnect the secondary air injection hoses/pipes from the Q29 secondary air injection solenoid valves.
3. Ignition ON, command the Air Pump ON with a scan tool.
4. Verify airflow to the Q29 secondary air injection solenoid valves.
• If no airflow
Replace the G21 secondary air injection pump.
• If airflow
5. Replace the appropriate Q29 secondary air injection solenoid valve or valves.
Component Testing
Relay Test
1. Ignition OFF, disconnect the appropriate relay.
2. Test for the following resistance between terminals 85-86.
* 50-75 ohms-KR25 secondary air injection pump relay
* 70-110 ohms-KR26 secondary air injection solenoid valve relay
• If not within the specified range
Replace the relay.
• If within the specified range
3. Test for infinite resistance between the terminals listed below:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
• If less than infinite resistance
Replace the relay.
• If infinite resistance
4. Install a 15 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.
5. Test for less than 2 ohms between terminals 30 and 87.
• If 2 ohms or greater
Replace the relay.
• If less than 2 ohms
6. All OK.
Repair Instructions
* 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 Pump Replacement Service and Repair
* Secondary Air Injection Bypass Valve Replacement - Left Side Secondary Air Injection Bypass Valve Replacement - Left Side for secondary air injection shutoff and check valve and pressure sensor replacement-Left Side
* Secondary Air Injection Bypass Valve Replacement - Right Side Secondary Air Injection Bypass Valve Replacement - Right Side for secondary air injection shutoff and check valve and pressure sensor replacement-Right Side
* Secondary Air Injection Pipe Replacement Secondary Air Injection Pipe Replacement
* Secondary Air Injection Pump Hose Replacement Secondary Air Injection Pump Hose Replacement
Repair Verification
1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs with a scan tool.
4. Ignition OFF, all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
5. Ignition ON.
6. Verify the scan tool AIR Pressure Sensor in each bank and the BARO pressure parameters are within 3 kPa (0.4 psi).
• If not within the specified range
Refer to Circuit/System Verification-step 1
• If within the specified range
7. Engine running.
8. Verify the scan tool AIR Press Sens Bn 1 and Bn 2 parameters increase between 5-11 kPa (0.7-1.6 psi) greater than BARO, when the AIR System is commanded ON with a scan tool.
• If not within the specified range
Refer to Circuit/System Verification-step 1.
• If within the specified range
9. Verify the scan tool AIR Press Sens Bn 1 and Bn 2 parameters increase between 14-22 kPa (2.0-3.2 psi), greater than BARO, when the AIR Pump Relay is commanded ON with a scan tool.
• If not within the specified range
Refer to Circuit/System Verification-step 1.
• If within the specified range
10. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset.
• If any DTC sets
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
• If no DTC sets.
11. All OK.