P1415

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, P01 12, P0113, P0117, P0118, P0300, P0325, P0327, P0335, P0441, P0502, P0503, and HO2S DTCs not set.
- The engine operating.
- The engine operates for greater than 15 seconds in short term fuel trim cells 2, 5, and 20.
- Engine speed is greater than 550 RPM.
- Maximum air flow is 22 g/s.
- ECT is greater than 50°C (122°F)
- IAT is greater than 10°C (50°F).
- Ignition voltage is greater than 11.6 volts.
- Engine load is less than 30%.

Conditions for Setting the DTC

- HO2S voltage does not go below 222 mV for 0.9 seconds when the AIR pump is enabled during closed operation.
- Short term fuel trim does not go above a predetermined amount when the AIR pump is enabled during closed 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

- Casting flash in the exhaust manifold 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 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 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 vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This isolates when the DTC failed.

- For an intermiffent condition, refer to Symptoms.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

3. A check valve that flows in both directions causes heat damage to the AIR system components.