P0410

Circuit Description
An AIR pump is used on this vehicle to lower tail pipe emissions on start-up. The PCM supplies a ground to the AIR pump relay, which energizes the AIR pump. The PCM monitors the HO2S voltages to diagnose the AIR system.
During the AIR test, the PCM activates the AIR pump during closed loop operation. When the AIR is activated, the PCM monitors the 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, P0107, P0108, P0112, P0113, P0117, P0118, P0125, P0171-P0175, P0200, P0300, P0335, P0336, P0351-P0358, P0440, P0442, P0443, P0446, P0449, P1120, P1220, P1221, P1258, P1441 and HO2S DTCs are not set.
^ The engine is running for greater than 2.0 seconds.
^ The maximum air flow is 22 g/s.
^ The Air Fuel ratio is 14.7:1
^ The engine load is less than 40%.
^ The ignition voltage is greater than 11.7 volts.
^ Engine is not operating in Power Enrichment, Decel Fuel Shut-off, or Catalyst Over-temperature Modes.
^ The engine is operating in closed loop for greater than 15 seconds.
^ The engine speed is greater than 725 RPM.
^ The ECT is greater than 80°C (176°F) but less than 110°C (230°F).
^ The IAT is greater than -10°C (-14°F).
^ The fuel system is operating in fuel trim cells 1, 2, 4, 5, or 6.

Conditions for Setting the DTC
The HO2S voltage does not go below 222 mV for 1.2 seconds, when the AIR pump turns ON during closed loop operation.

OR

The short term fuel trim does not change more than a predetermined value, when the AIR pump turns ON during closed loop operation.

Action Taken When the DTC Sets
^ The PCM illuminates the Malfunction Indicator Lamp on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure records.

Conditions for Clearing the MIL/DTC
^ The PCM turns the MIL OFF after three consecutive ignition cycles that the diagnostic runs and does not fail.
^ A last test failed (current DTC) clears when the diagnostic runs and does not fail.
^ A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
^ Use a scan tool in order to clear the MIL/DTC.

Diagnostic Aids

Important:
^ Remove any debris from the PCM/TAC module connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM/TAC modules.
^ For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter Kit J 35616-A. Using this kit prevents damage to the harness/component terminals.
^ Using Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This isolates when the DTC failed.
^ For an intermittent, refer to Symptoms. Symptom Related Diagnostic Procedures

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. If DTCs P0412 or P0418 are set, diagnose those DTCs first.
4. This step is testing for battery voltage at the AIR pump relay and the AIR solenoid relay. If voltage is not present at both of the AIR relays the AIR system does not operate properly.
5. The scan tool offers three modes of AIR operation, AIR solenoid, AIR pump, and AIR system. Use the AIR system selection when commanding the AIR pump, or relays. This mode ensures that the entire AIR system is responding to the scan tool commands. If DTCs P0412 or P0418 are not set and the relays do not respond to the scan tool commands, inspect for excessive resistance in all of the circuits associated with the AIR system.
6. This step is testing for power to the AIR pump.
7. This step is testing the ground circuit for the AIR pump.
10. A restriction in a hose or pipe before the systems divides will cause this DTC to set. Inspect for kinks or blockages from the AIR pump to the connection point where the AIR system divides.
12. This step is testing for a grounded circuit between the AIR pump and the AIR pump relay.
13. This step is testing for a grounded circuit between the AIR pump and the AIR solenoid relay.