P0410

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 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 responds, the PCM sets either a DTC P1415 or a DTC P1416, in order to indicate 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, P0335, P0336, P0351-P0358, P0443, P0500, P0502, P0503, P1133, P1134, P1153, P1154, and P1258 are not set.
^ The engine operates for more than 30 seconds.
^ The engine run time is more than 15 seconds after closed loop operation.
^ The engine speed is more than 850 RPM.
^ The vehicle speed is 15 km/h (25 mph).
^ 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 engine is not operating in the power enrichment mode or in the deceleration fuel cut-off mode.
^ The short-term integrators are monitored while they are in fuel trim cells 1, 2, and 5.

CONDITIONS FOR SETTING THE DTC
^ When the AIR pump turns ON during closed loop operation, he HO2S voltage does not go below 222 mV for 1 second.
^ When the AIR pump turns ON during closed loop operation, The short term fuel trim does not change a pre-determined 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

IMPORTANT:
^ Before you service the PCM, remove any debris from the PCM connector surfaces. Inspect the PCM connector gaskets when you diagnose or replace the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM.
^ For any test that requires probing the PCM or probing a component harness connector, use the J 35616-A connector test adapter kit. Using this kit prevents damage to the harness and component terminals. Refer to Using Connector Test Adapters in Diagrams.
^ Excessive resistance in any circuit related to the AIR system may cause this DTC to set. Listen for a click as the AIR solenoid and the AIR relay are commanded ON and OFF. If either component does not operate when commanded ON and OFF, and no other DTC is set, inspect the related circuits for excessive resistance.
^ The scan tool offers 3 modes of AIR output controls: the AIR Pump Relay, the AIR Solenoid, and AIR System. Select the AIR System function for all AIR diagnostics.
^ If air is present at both outlet hoses when the AIR system is enabled, inspect the AIR check valves and pipes for damage or restrictions.
^ For underhood fuse block terminal identification, refer to Electrical Center Identification Views in Diagrams.

For an intermittent condition, refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-9:

Steps 10-17:

Steps 18-32:

The numbers below refer to the step numbers on the diagnostic table.
2. The AIR pump fuse is located in the engine wiring harness junction block # 1.
3. If the AIR pump fuse is OK, then diagnose DTC P0412 or DTC P0418 first.
5. The AIR pump relay is located in the engine wiring harness junction block # 2.
13. If the AIR pump functions properly, inspect for intermittent shorts to ground or connections.
22. Inspect the circuits for a short to ground between the AIR pump fuse and the AIR pump relay. Also inspect the circuit for a short to ground between the splice and the AIR solenoid valve.