P1415

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
An AIR pump is used on this vehicle to lower tail pipe emissions on start-up. The Vehicle Control Module (VCM) supplies a ground to the AIR pump relay, which energizes the AIR pump and the AIR solenoid.

The VCM will run two tests using the Heated Oxygen Sensor (HO2S) voltages to diagnose the AIR system. Test one (passive) consists of the following:

PART 1
When the AIR pump is enabled, the VCM monitors the HO2S voltage. If the HO2S voltages go below a threshold, the VCM interprets this as an indication that the AIR System is operational.

PART 2
When the AIR pump is disabled, the VCM monitors the HO2S voltages. The HO2S voltages should increase above a threshold and switch normally. If the VCM did not sense more than a predetermined amount of HO2S rich switches, a malfunction will be reported. If both of these tests indicate a pass, no further action is taken. If one of the above tests failed or is inconclusive, the diagnostic will proceed to test two.

Test two (active) consist of the following:
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 Intake Air Temperature (IAT) sensor DTCs
^ No active Engine Coolant Temperature (ECT) sensor DTCs
^ No active Throttle Position (TP) sensor DTCs
^ No active HO2S DTCs
^ No active Vehicle Speed Sensor (VSS) DTCs
^ No active misfire DTCs
^ No active system voltage DTCs
^ No active fuel trim DTCs
^ No active evaporative emission (EVAP) DTCs
^ No active power enrichment
^ No active DFCO
^ The air flow is less than 25 g/s.
^ The engine load is less than 34 percent.
^ The air fuel ratio is 14.7.
^ The engine speed is more than 550 RPM.
^ The ECT is between 60-107°C (140-225°F).
^ The engine load is less than 34 percent.
^ The system voltage is more than 11.7 volts.
^ The air flow is less than 25 g/s.

CONDITIONS FOR SETTING THE DTC
The HO2S voltage is more than 222 mv on bank 1 for more than 1 second when the AIR pump is turned ON during Closed Loop operation.

ACTION TAKEN WHEN THE DTC SETS
The VCM will turn ON the Malfunction Indicator Lamp (MIL) after two consecutive test cycles with the fault active.

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. 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.
^ A scan tool can 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

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 a poor connection, rubbed through wire insulation, or a broken wire inside the insulation.

Thoroughly check any circuitry that is suspected of causing the intermittent complaint for the following conditions:
^ Backed out terminals
^ Improper mating
^ Broken locks
^ Improperly formed or damaged terminals
^ Poor terminal to wire connections
^ Physical damage to the wiring harness
^ Corrosion
^ Moisture in the connector

TEST DESCRIPTION
The numbers below refer to the step numbers 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.