P1415

CIRCUIT DESCRIPTION
An AIR pump is used on this vehicle in order to reduce the fails pipe emissions during start-up. The PCM supplies a ground to the AIR pump relay, which energizes the AIR pump.

The PCM monitors the HO2S voltages in order 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 monitors the 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 in order 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, P0121, P0122, P0123, P0131-P0135, P0137, P0138, P0140, P0141, P0151-P0155, P0171-P0175, P0200, P0300, P0325, P0327, P0332, P0335, P0336, P0351-P0358, P0430, P0500, P0502, P0503, P1133, P1134, P1153, and P1154 are not set.
^ The engine operates for more than 30 seconds.
^ The engine run time is more than 20 seconds after closed loop operation.
^ The engine speed is more than 850 RPM.
^ The maximum air flow is 22 g/s.
^ The ECT is between -10°C (14°F)-110°C (255°F).
^ The IAT is between -10°C (14°F)-100°C (212°F).
^ The ignition voltage is more than 11.7 volts.
^ The engine load is less than 40 percent.
^ The air fuel ratio is 13.125:1.
^ The engine is not operating in power enrichment mode OR in deceleration fuel cut-off mode.
^ The short term integrators are monitored while in fuel trim cells 1, 2, 5, or 20.

CONDITIONS FOR SETTING THE DTC
^ When the AIR pump turns ON during closed loop operation, the HO2S voltage does not go below 222 mV for 0.9 seconds.
^ When the AIR pump turns ON during closed loop operation, the short term fuel trim does not change more than a predetermined value.

ACTION TAKEN WHEN THE DTC SETS
^ The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/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.
^ Use a scan tool in order to clear the MIL and the DTC.

DIAGNOSTIC AIDS
^ An obstruction in the exhaust manifold may restrict the amount of air flow that is necessary to affect the HO2S voltage. If you suspect this condition, remove the air pipe from the manifold and inspect the passage.
^ For an intermittent condition, refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-9:

The number below refers to the step number on the diagnostic table.
3. A check valve that flows in both directions causes heat damage to the AIR system components.