Circuit Description
A secondary air injection (AIR) pump is used on this vehicle to lower tail pipe emissions on start-up. The powertrain control module (PCM) supplies a ground to the AIR pump relay, which energizes the AIR pump and the AIR solenoid valve. Engine vacuum is applied to the AIR shut-off valve when the AIR solenoid is energized. The engine vacuum opens the AIR shut-off valve which allows air to flow to the exhaust manifolds.
The PCM monitors the heated oxygen sensor (HO2S) voltages to diagnose the AIR system.
During the AIR test, the PCM activates the AIR pump during Closed Loop operation. When the AIR system is activated, the PCM monitors the heated oxygen sensor (HO2S) voltages and short term fuel trim values for both banks of the engine. If the AIR system is operating properly, the HO2S voltages should go low and the short term fuel trim should go high.
If the PCM determines that the HO2S voltages for both banks did not respond as expected during the tests, DTC P0410 sets. If only one sensor responded, the PCM sets either a DTC P1415 or P1416 to indicate on which bank the AIR system is inoperative.
Conditions for Running the DTC
| • | DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0151, P0152, P0153, P0154, P0155, P0157, P0158, P0160, P0161, P0171, P0172, P0175, P0200, P0300, P0440, P0442, P0446, P0506, P0507, or P1441 are not set. |
| • | The mass air flow (MAF) is less than 20 g/s. |
| • | The manifold absolute pressure (MAP) is between 26-90 kPa (3.7-13 psi). |
| • | The barometric pressure (BARO) is more than 75 kPa (10.9 psi). |
| • | The engine speed is more than 750 RPM. |
| • | The engine coolant temperature (ECT) is between 75-110°C (167-230°F). |
| • | The fuel level is more than 10 percent. |
| • | The vehicle speed is less than 25 km/h (15 mph). |
| • | The intake air temperature (IAT) is between 2-100°C (36-212°F). |
| • | The startup ECT is below 80°C (176°F). |
| • | The air/fuel ratio is 14.7:1. |
| • | The engine load is less than 33 percent. |
Conditions for Setting the DTC
| • | The HO2S voltage remains 222 mV for more than 2 seconds. |
| • | The short term fuel trim does not increase by 6 percent for each bank when the AIR pump is active during closed loop. |
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.
| • | Casting flash in the exhaust manifold or carbon build-up may restrict the amount of air flow necessary to affect the HO2S voltage. If you suspect this, remove the air pipe from the manifold and inspect the passage. |
| • | Using the Freeze Frame/Failure Records may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same Freeze Frame conditions that you observed in order to isolate when the DTC failed. Duplicate conditions such as the following: |
| - | The RPM |
| - | The load |
| - | The vehicle speed |
| - | The temperature |
| • | A check valve that flows in both directions causes heat damage to the AIR system components. |
| • | For an intermittent condition, refer to Intermittent Conditions . |
Step | Action | Values | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||||||||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |||||||||
2 |
Important: Before proceeding with this diagnostic table ensure that the AIR pump is operating and that air is present at the outlet of the AIR shut-off valve. If the AIR pump is inoperative and no air is present at the outlet of the AIR shut-off valve, refer to DTC P0410 for further diagnosis.
Does the HO2S voltage drop below the specified value? | 350 mV | Go to Diagnostic Aids | Go to Step 3 | ||||||||
3 |
Did you find and correct conditions? | -- | Go to Step 7 | Go to Step 4 | ||||||||
4 |
Is air pressure flow present at the hose outlet? | -- | Go to Step 6 | Go to Step 5 | ||||||||
5 | Repair the restriction or blockage in the applicable bank AIR hoses and pipes, between the exhaust manifold and the point where the system branches to both sides of the engine. Did you complete the repair? | -- | Go to Step 7 | -- | ||||||||
6 | Replace the appropriate check valve. Refer to Secondary Air Injection Check Valve and Check Valve Pipe Replacement - Bank 1 or Secondary Air Injection Check Valve and Check Valve Pipe Replacement - Bank 2 . Did you complete the replacement? | -- | Go to Step 7 | -- | ||||||||
7 |
Does the DTC run and pass? | -- | Go to Step 8 | Go to Step 2 | ||||||||
8 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |||||||||
