P1415

Circuit Description
An AIR Pump is used on this vehicle to lower tail pipe emissions on start-up. The VCM supplies a ground to the AIR Pump Relay in order to energize the AIR Pump and the AIR Solenoid.

The VCM will run a test using the 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. If the VCM determines that the HO2S voltages for both banks did not respond as expected during the tests, DTC P0410 will set. If only one sensor responded, the VCM will set either a DTC P1415 or P1416 to indicate on which bank the AIR System is inoperative.

Conditions for Running the DTC
^ No active ECT sensor DTCs
^ No active HO2S sensor DTCs
^ No active misfire DTCs
^ No active MAP DTCs.
^ No active fuel trim DTCs
^ No active CCP DTCs
^ No active TP Sensor DTCs
^ No active IAT DTCs
^ No active MAF DTCs
^ No active VSS DTCs
^ No system voltage DTCs
^ Power enrichment not active
^ Decel fuel cut-off (DFCO) not active
^ Catalyst overtemp protection is not active
^ The air/fuel ratio is 14.7:1
^ The engine speed is above 550 RPM
^ The engine load is less than 34 percent
^ The system has been in closed loop operation for more than 20 seconds
^ The MAF is less than 25 g/s
^ The system voltage more than 11.7 volts
^ The ECT is between 80-110°C (176-230°F)
^ The short term fuel trim is between 124-132

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 Control Module illuminates the Malfunction Indicator Lamp (MIL) if a failure is detected during 2 consecutive key cycles.
^ The Control Module will set the DTC and records the operating conditions at the time the diagnostic fails. The Control Module stores the failure information in the scan tools Freeze Frame and/or the Failure Records.

Conditions for Clearing the MIL/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 (coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the engine coolant temperature is more than 70°C (158°F) during the same ignition cycle).
^ Use the scan tool Clear Information function.

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

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 check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis. Symptom Related Diagnostic Procedures

Test Description
Number(s) below refer to the step number(s) on the diagnostic table.
2. This step determines if the cause of this DTC is still present.
5. This step determines if there is a problem before or after the check valve.
7. Although P0410 may not have set, the P0410 diagnostic includes a more comprehensive check of the AIR system that may help identify a symptom not identified in this diagnostic.