P0410

Diagnostic Chart (Part 1 Of 4):

Diagnostic Chart (Part 2 Of 4):

Diagnostic Chart (Part 3 Of 4):

Diagnostic Chart (Part 4 Of 4):

Schematic:

CIRCUIT DESCRIPTION
An AIR pump is used on this vehicle to lower fail pipe emissions on start-up. The VCM supplies a ground to the AIR pump relay which energizes the AIR pump and the AIR solenoid.

The Vehicle Control Module (VCM) will run a test using the Heated Oxygen Sensor (HO2S) voltages to diagnose the AIR system.

During this test the VCM will activate the AIR pump during Closed Loop operation. When the AIR system is activated, the VCM will monitor 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.

The VCM checks that the HO2S voltages return to above a rich threshold when the AIR pump is disabled.

This Diagnostic Trouble Code (DTC) will set when the VCM determines that the HO2S voltages for BOTH banks did not respond as expected during the tests. If only one sensor responded, the VCM will set either a DTC P1415 or P1416 in order to indicate which bank of the AIR system is inoperative.

CONDITIONS FOR RUNNING THE DTC
^ No active Engine Coolant Temperature (ECT) sensor DTCs
^ No active Idle Air Control (IAC) sensor DTCs
^ No active Heated Oxygen Sensor (HO2S) DTCs
^ No active misfire DTCs
^ No active Manifold Absolute Pressure (MAP) DTCs.
^ No active fuel trim DTCs
^ No active Evaporative Emission (EVAP) DTCs
^ No active Throttle Position (TP) sensor DTCs
^ No active Intake Air Temperature (IAT) DTCs
^ No active Mass Air Flow (MAF) DTCs
^ The MAF is less than 25 g/s.
^ The commanded air/fuel ratio is 14.7:1.
^ The engine load is less than 34 percent.
^ Power enrichment mode is not active.
^ Decel Fuel Cutoff Mode (DFCO) is not active.
^ Catalyst overtemp protection is not active.
^ The system has been in Closed Loop mode for more than 20 seconds.
^ The short term fuel trim is between 124-132 counts.
^ The engine speed is more than 550 RPM.
^ The ECT is between 80-110°C (176-230°F).
^ The system voltage is 11.7 volts or more.

CONDITIONS FOR SETTING THE DTC
^ The O2 sensor voltage is less than 222 mV for more than 1.3 seconds.
OR
^ The short term fuel trim value changes more than 20 percent when the secondary air injection pump is turned on and the system is in Closed Loop operation.

ACTION TAKEN WHEN THE DTC SETS
^ The VCM illuminates the MIL during the second consecutive drive cycle in which the diagnostic reports a fail.
^ The VCM will set the DTC and records the operating conditions at the time the diagnostic fails. The VCM stores the failure information in the scan tools Freeze Frame and Failure Records.

CONDITIONS FOR CLEARING THE MIL OR DTC
^ The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.
^ A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C (158°F) during the same ignition cycle.
^ Use a scan tool in order to clear the DTCs.

DIAGNOSTIC AIDS
Low AIR system volume may cause a DTC P1415, P1416, or an intermittent complaint. Also check for the following conditions:
^ Pinched, kinked, or restricted AIR pipes, hoses, or fittings
^ Leaks, holes, loose fittings, or hoses
^ Restricted or obstructed AIR pump inlet
^ Leaks or restrictions in the vacuum hoses for the AIR shut off valve.

An AIR supply hose that is melted before the check valve could indicate exhaust gas back-flow past the check valve.

An intermittent may be caused by any of the following conditions:
^ A poor connection
^ Rubbed through wire insulation
^ A broken wire inside the insulation

Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent and Poor Connections in Diagrams.

If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Diagrams.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This step will determine if the AIR system is functioning correctly.
12. This step will determine if the VCM is capable of controlling the AIR pump relay.
15. This step is to check for a short to voltage on the control circuit.
16. The engine must be running for this test to ensure a vacuum supply to the system.
17. This step will determine if the AIR pump is capable of producing airflow.
29. An open fuse for the battery feed circuit could be caused by a short to ground in the components operated by the relay. Also check the wiring in the circuits on the switched side of the relay. Refer to Diagnostic Aids.