P0410

CIRCUIT DESCRIPTION
The PCM activates the secondary air injection system by grounding the AIR relay. This energizes the pump and the vacuum control solenoid. As vacuum is applied to the two shutoff valves, fresh air is allowed to pass through them. The AIR pump forces fresh air past the shutoff valves and into the exhaust stream in order to accelerate catalyst operation. The PCM will run up to 3 diagnostic tests using the 02S1 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 DTC will set. When inactive, the shutoff valve prevents air flow in either direction.

CONDITIONS FOR RUNNING THE DTC
^ AIR system commanded ON for more than 20 seconds.
^ The IAT is between 1°C and 151°C (32°F and 302°F).
^ The ECT is between 5°C and 114°C (41°F and 230°F).
^ Battery voltage is more than 11.7 volts.
^ Engine run time is more than 200 seconds.
^ Calculated air flow is more than 11 gps.
^ Accumulated flow between 240 cts and 600 cts.
^ BLM cell of 16 or 17.
^ TPS changes less than 5 percent.
^ Stabilization time of more than 1 second.
^ Fuel ethanol composition of less than 15 percent.
^ DTCs 105, 107, 108, 112, 113, 117, 118, 122, 123, 130, 131, 132, 133, 1133, 134, 171, 172, 178, 179, 201, 202, 203, 204, 300, 336, 340, 341, 506, 507, 601, 602, and 1621 are not set.

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

ACTION TAKEN WHEN THE DTC SETS
^ The Malfunction Indicator Lamp (MIL) illuminates after two ignition cycles with the malfunction present.
^ The PCM records the operating conditions at the time the diagnostic fails. The Freeze Frame and Failure Records buffers stores this information.
^ A history DTC is stored.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The MIL will turn OFF after 3 consecutive ignition cycles in which the diagnostic runs without a fault.
^ A history DTC will clear after 40 consecutive warm up cycles without a fault.
^ A scan tool can clear the DTCs.

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.

Diagnostic Chart (Part 1 Of 3):

Diagnostic Chart (Part 2 Of 3):

Diagnostic Chart (Part 3 Of 3):

TEST DESCRIPTION
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 shutoff valve.
15. This step determines if the lack of air is caused by an open in the AIR supply hose or a defective shutoff valve.