P0410

Schematic:

CIRCUIT DESCRIPTION
An AIR pump is used on this vehicle to lower fail 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, P0121, P0122, P0123, P0171-P0175, P0200, P0300, P0335, P0336, P0351-P0358, P0443, P0500, P0502, P0503, P1258, and HO2S DTCs not set.
^ The engine operates for more than 2 seconds.
^ The engine run time is more than 15 seconds after closed loop operation.
^ The engine speed is more than 900 RPM.
^ The maximum air flow is 22 g/s.
^ The ECT is between 66°C (151°F) and 110°C (255°F).
^ The IAT is more than -10°C (14°F).
^ The ignition voltage is more than 11.7 volts.
^ The engine load is less than 42.5 percent.
^ Not operating in power enrichment mode OR deceleration fuel cut-off mode.
^ In short term Fuel Trim cells 1, 2, and 5.

CONDITIONS FOR SETTING THE DTC
^ HO2S voltage does not go below 222 mV for 1 second, when the AIR pump turns ON during closed loop operation.
^ Short term fuel trim does not change 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 (MIL) 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 Malfunction Indicator Lamp (MIL) OFF after 3 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 40 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 connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing 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 a component harness connector, use the J 35616-A connector test adapter kit. Using this kit prevents damage to the harness/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 an audible 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 three modes of AIR output controls. AIR Pump Relay, 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 fuseblock terminal identification, refer to Electrical Center Identification Views in Diagrams.

For an intermittent, refer to Symptoms. Symptom Related Diagnostic Procedures

TEST DESCRIPTION

Steps 1 - 9:

Steps 10 - 15:

Steps 16 - 28:

Steps 29 - 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 P0418 first.
5. The AIR pump relay is located in the engine wiring harness junction block #2.
13. Inspect for intermittent shorts to ground or connections, if the AIR pump functions properly.
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.