P0410

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) activates the Secondary Air Injection (AIR) system by grounding the AIR relay. This energizes the pump and the vacuum control solenoid. As vacuum is applied to the 2 shut-off valves, fresh air is allowed to pass through them. The AIR pump forces fresh air past the shut-off valves and into the exhaust stream in order to accelerate catalyst operation. The PCM will run up to 3 diagnostic tests using the oxygen sensors (O2S) 1 voltage and short term FT to verify system operation. The system can be diagnosed during normal secondary air injection operation or the scan tool can activate the system specifically for diagnostic purposes. If an air flow problem is detected this Diagnostic Trouble Code (DTC) will set. When inactive, the shut-off valve prevents air flow in either direction.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0105, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0133, P0134, P0171, P0172, P0177, P0178, P0179, P0300, P0301-P0304, P0336, P0341, P0506, P0507, P0601, or P1133 are not set.
^ The AIR system is commanded ON for more than 20 seconds.
^ The Intake Air Temperature (IAT) is between 1-151°C (32-302°F).
^ The Engine Coolant Temperature (ECT) is between 5-114°C (41-230°F).
^ The battery voltage is more than 11.7 volts.
^ The battery voltage is more than 11.7 volts.
^ The engine run time is more than 200 seconds.
^ The calculated air flow is more than 11 gps.
^ The accumulated flow more than 240 cts.
^ A fuel trim cell of 16 or 17.
^ The long term fuel trim is between 3 and +4
^ The base pulse width is more than 1.2 ms
^ The Throttle Position (TP) sensor changes less than 5 percent.
^ Stabilization time of more than 1 second.

CONDITIONS FOR SETTING THE DTC
Lean time is more than 1 second during 4 second active test.

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
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 Testing for Intermittent and Poor Connections in Diagrams.

If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Diagrams.

TEST DESCRIPTION

Steps 1-11:

Steps 12-23:

Steps 24-31:

The numbers below refer to the step numbers on the diagnostic table.
14. This step checks for a restriction in the engine vacuum supply to the AIR shut-off valve.
15. This step determines if the lack of air is caused by an open in the AIR supply hose or a defective shut-off valve.