P0410 (Dual Pump System)
CIRCUIT DESCRIPTIONThe 2 Secondary Air Injection (AIR) pumps on this vehicle lower the tail pipe emissions during start-up. The AIR system consists of the following items:
^ The AIR pumps
^ The shutoff valves
^ The vacuum control solenoid valve
^ The system hoses and piping
^ The AIR relays, the fuses, and the related wiring.
The Powertrain Control Module (PCM) uses the AIR relays in order to control the AIR pumps. The PCM also controls the AIR vacuum control solenoid valve that supplies the vacuum to the AIR shutoff valves. When the AIR system is inactive, the AIR shutoff valves prevent air flow in either direction. When the AIR system is active, the PCM applies ground to 1 of the AIR relays and to the vacuum control solenoid valve. After a few seconds, the PCM applies ground to the other AIR relay. Fresh air flows from the pumps, through the system hoses, past the shutoff valves, and into the exhaust stream. The air helps the catalyst to quickly reach a working temperature, lowering the tail pipe emissions during a start-up. The PCM tests the AIR system for the following conditions:
^ The AIR system, including both banks, resulting in Diagnostic Trouble Code (DTC) P0410
^ The AIR system bank,resulting in DTC P1415
^ The AIR system bank 2, resulting in DTC P1416
^ The AIR relays, resulting in DTC P0418 and DTC P0419
^ The AIR vacuum control solenoid, resulting in DTC P0412
The PCM runs a passive test and an active test in order to diagnose the AIR system. Both tests involve a response from the fuel control Heated Oxygen Sensors (HO2S)-HO2S Bank 1 Sensor 1 and HO2S Bank 2 Sensor 2. If both passive tests pass, the PCM takes no further action. If either part of the passive test fails or is inconclusive, the PCM initiates the active tests. If the PCM determines that the HO2S voltages did not respond as expected during the tests, DTC P0410 sets. For further information concerning the AIR System and the system tests, refer to Secondary Air Injection (AIR) System Description.
CONDITIONS FOR RUNNING THE DTC
Passive Tests
^ The engine is running.
^ The engine speed is more than 600 RPM.
^ The throttle is steady
^ The engine load is less than 80 percent.
^ The system voltage is more than 10.5 volts.
^ The Mass Air Flow (MAF) is less than 35 g/s.
^ The air/fuel ratio is more than 12.5:1.
^ The Engine Coolant Temperature (ECT) is between 5-110°C (41-230°F).
^ The Intake Air Temperature (IAT) is between 5-60°C (41-140°F).
^ The power enrichment or the Deceleration Fuel Cut-Off are not active.
Active Tests
^ The engine is running.
^ The engine speed is more than 600 RPM.
^ The throttle is steady.
^ The engine load is less than 80 percent.
^ The system voltage is more than 10.5 volts.
^ The MAF is less than 35 g/s.
^ The fuel system is in closed-loop operation.
^ The Evaporative Emissions (EVAP) purge is active.
^ The ECT is more than 68°C (154°F).
CONDITIONS FOR SETTING THE DTC
Passive Tests
^ During operation of the AIR pumps, the HO2S voltage for both fuel control sensors is more than 250 mV for 20 seconds (200 mV for 7 seconds during a hot start).
^ When the AIR pumps are turned OFF, the HO2S voltage for both fuel control sensors is below 740 mV for 20 seconds (7 seconds during a hot start).
^ The condition is present for 3 occurrences.
Active Test
The HO2S voltage for both fuel control sensors is more than 250 mV for 3 occurrences.
ACTION TAKEN WHEN THE DTC SETS
^ The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
^ A current DTC "Last Test Failed" clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
^ Use a scan tool in order to clear the MIL and the DTC.
DIAGNOSTIC AIDS
NOTE: Refer to Connector Test Adapter Kit J 35616-A Notice in Service Precautions.
Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help to diagnose the condition. The information may also help to determine how often the condition that set the DTC occurs.
TEST
