P0410
Schematic:
CIRCUIT DESCRIPTION
An AIR pump is used on this vehicle to lower tail pipe emissions at start-up. The Vehicle Control Module (VCM) supplies a ground to the AIR pump relay, which energizes the AIR pump and the AIR solenoid.
When the AIR pump is enabled, the VCM monitors the HO2S voltage. If the HO2S voltages go below a calibrated threshold value, the VCM interprets this as an indication that the AIR system is operational.
When the AIR pump is disabled, the VCM monitors the HO2S voltages. The HO2S voltages should increase above a calibrated threshold value and switch normally.
If the VCM did not sense more than a predetermined amount of HO2S rich switches, a malfunction will be reported.
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 IAC sensor DTCs
^ No active HO2S DTCs
^ No active misfire DTCs
^ No active MAP DTCs
^ No active Fuel Trim DTCs
^ No active EVAP DTCs
^ No active TP sensor DTCs
^ No active IAT DTCs
^ No active 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.
^ DFCO (Decel Fuel Cutoff Mode) 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.
4. This step will determine if the AIR system is flinctioning correctly.
16. This step determines if there is a short to voltage on the AIR pump supply voltage circuit. Allowing the MR pump to operate continuously.
25. This step is to test for a short to voltage on the AIR solenoid supply voltage circuit keeping the AIR solenoid ON at all times.
Steps 1-5:
Steps 6-10:
Steps 11-14:
Steps 15-20:
Steps 21-26:
Steps 27-31:
Steps 32-37:
Steps 38-45:
Steps 46-52:
Steps 53-57:
