P0410
DTC P0410 AIR System
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 which energizes the AIR Pump and the AIR Solenoid.
The VCM will run two tests using the 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 test 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) consists 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.
This 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 to indicate which bank of 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 greater than 550 RPM.
- The ECT is between 60 - 107 °C (140 - 224 °F).
- The system voltage is 11.7 volt or greater.
Conditions for Setting the DTC
- The O2 sensor voltage is less than 222 mv for more than 1 second, 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 will turn ON the Malfunction Indicator Lamp (MIL) after two consecutive test cycles with the fault active.
Conditions for Clearing the MIL/DTC
- The VCM 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 startup 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, kin ked 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 check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis.
If a repair is necessary, then refer to Wiring Repairs or Connector Repairs.
Step 1:
Steps 2 - 6:
Steps 7 - 12:
Steps 13 - 17:
Steps 18 - 21:
Steps 22 - 26:
Steps 27 - 34:
Steps 35 - 39:
Steps 40 - 41:
Test Description
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.