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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 254 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P0410: Secondary Air Injection System >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before you service the PCM or the Throttle Actuator Control (TAC), remove any debris from the module connector surfaces, and from the module connector gaskets. Verify that the gaskets are correctly installed. The gaskets prevent debris from contaminating the modules.
NOTE: When commanding the AIR system ON with a scan tool the PCM will activate the AIR pump and the AIR solenoid. The fuel control system will then enter an open loop status. This action will allow fresh air to enter the exhaust stream and cause the front HO2S mV parameters to drop to near zero 0 mV. This would indicate a properly operating system. However if the AIR pump does not operate or there is no airflow from the pump entering the exhaust stream due to a leak in the system, the HO2S parameter may still drop below 100 mV. This is due to fresh air being drawn into the exhaust stream from the check valve operation and the opening of the shut-off valve. The HO2S will respond with a drop in mV readings as a result of this air leaning out the exhaust gases. The voltages may drop to below 100 mV but not approach the near zero 0 mV parameter. An AIR pump which exhibits an exhaust noise through the pump may have an AIR solenoid or AIR shut-off valve stuck open. The Short Term Fuel Trims may indicate a higher than normal value. This condition may not set DTC P0410. An AIR shut-off valve that has become inoperative and has shown indications of exhaust gases in the outlet port, or heat damaged hoses may indicate an exhaust check valve failure. For any test that requires probing PCM or a component harness connectors, use Connector Test Adapter Kit (J- 35616-A). Using this kit prevents damage to the harness or component terminals.
  1. If the condition is intermittent, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  2. The vacuum lines at the AIR solenoid cannot be reversed, this condition may hold the shut-off valve open continually.
  3. An AIR solenoid leaking vacuum will hold the shut-off valve open an exhaust noise may be heard through the air cleaner. Fuel Trims values may also indicate a higher than normal value at idle. This DTC may not set.
  4. Leaking exhaust check valves will leave traces of exhaust carbon in the AIR system, with a possibility of heat damage to the hoses and AIR shut-off valve.
  5. An intermittent may be caused by any of the following conditions:
    • Low system air flow.
    • Excessive exhaust system back pressure.
    • Moisture, water or debris ingested into the AIR pump.
    • Pinched, kinked, heat damaged, or deteriorated hoses or vacuum lines.
    • Restrictions in the pump inlet, duct, or filter.
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