P0410

DESCRIPTION
The control module activates the Secondary Air Injection (AIR) System by grounding both the pump relay and the vacuum control solenoid control circuits simultaneously. This energizes the AIR pump and the vacuum control solenoid. Vacuum is then applied, opening the valves. The pump then forces fresh air into the exhaust stream in order to accelerate catalyst operation. The control module will run up to 3 diagnostic tests using the pre-catalyst Heated Oxygen Sensor (HO2S) voltage and Short Term FT to diagnose the system. The system can be diagnosed during normal Secondary Air Injection operation or the control module can activate the system specifically for diagnostic purposes. If an air flow problem is detected this DTC will set. When inactive, the system prevents air flow in either direction.

CONDITIONS FOR RUNNING THE DTC
DTCs P0102, P0103, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171, P0172, P0300, P0440, P0442, P0443, P0446, P0449, P0506, P0507, P1111, P11112, P1114, P1115, P1121, P1122, P1133, P1134 are not set.

CONDITIONS FOR SETTING THE DTC
^ The pre-catalyst HO2S voltage remains above a predetermined lean value during the test.

AND

^ The Short Term FT does not increase a calibrated amount during the test.
^ Both conditions above exist for 3 consecutive tests.

ACTION TAKEN WHEN THE DTC SETS
^ First failure:
- The MIL is not turned ON.
- A DTC is stored in memory under Failed Last Test.
- The Failure Records are stored.
^ Second consecutive drive cycle with a failure:
- The MIL is turned ON.
- A DTC is stored in memory under history.
- The Freeze Frame data is stored.
- The Failure Records are stored.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the Malfunction Indicator Lamp (MIL) after the third consecutive trip the diagnostic has run and passed.
^ The history DTC will clear if the fault conditions have not been detected for 40 warm-up cycles.
^ A scan tool can be used to clear DTC information.

DIAGNOSTIC AIDS

NOTE: Use the connector test adapter kit J 35616-A for any test that requires probing the following items:
^ The PCM harness connectors
^ The electrical center fuse/relay cavities
^ The component terminals
^ The component harness connector

Using this kit will prevent damage caused by the improper probing of connector terminals.

If the problem is intermittent, refer to Intermittent Conditions. Intermittent Conditions

If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set. Also refer to Testing for Intermittent and Poor Connections in Diagrams.

A short to voltage in the pump relay control circuit can result in the AIR pump running continuously with the ignition OFF by backfeeding to ground. This will eventually result in pump failure.

An AIR pump that had become inoperative and had shown indications of having exhaust gases in the outlet port would indicate check valve failure.

TEST DESCRIPTION

Steps 1-13:

Steps 14-28:

Steps 29-42:

The number below refers to the step number on the diagnostic table.
41. The replacement PCM must be programmed.