Diagnostic Aids
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
- 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 a open loop status. This action will allow fresh air to enter the exhaust stream and allow the HO2S 1 mV parameters to drop to near 0 mV. This would indicate a properly operating system.
However if the AIR pump does not operate or there is no airflow from the AIR pump entering the exhaust stream due to a leak in the AIR system, the HO2S 1 mV parameter may still decrease to 100 mV. This is due to fresh air being drawn into the exhaust stream from the exhaust check valve operation and the opening of the AIR shut-off valve. The HO2S 1 will respond with a decreasing mV parameter as a result of fresh air leaning out the exhaust gases. The HO2S 1 parameter voltages may decrease to nearly 100 mV but not approach the near 0 mV parameter.
- For any test that requires probing the PCM harness connector or probing a component harness connector, use the J 35616 Connector Test Adapter Kit. Using this kit prevents damage to the component terminals and to the harness. Refer to Using Connector Test Adapters in Wiring Systems.
DTC P0410
| AIR Pump Relay Underhood Electrical Center Terminal Identification | |||
|---|---|---|---|
| Front of Vehicle | |||
| Left Side of Vehicle | Ignition 1 voltage | Battery positive voltage | Right Side of Vehicle |
| Pump Supply | Control | ||
- For an intermittent condition, refer to Intermittent Conditions .
- The vacuum lines at the AIR solenoid cannot be reversed, this condition may hold the shut-off valve open continually.
- Leaking exhaust check valves will leave traces of exhaust carbon and water laden exhaust gases in the AIR system and a possibility of heat damage to the AIR hoses and AIR shut-off valve.
- 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 hoses.
- Restrictions in the pump inlet, duct, or filter