P0411, 0413, 0414

Diagnostic Codes: P 0411, P 0413, P 0414

Monitoring Procedure
The diagnostics for auxiliary air injection combine air flow and electrical circuit monitoring.

Air Flow Monitoring
In hot idle conditions, oxygen sensor feedback is used to detect the auxiliary air injected into the exhaust. If a change in the exhaust condition is detected then the test is passed, if not, a fault is present. There is no default strategy.

Electrical Circuit Monitoring
An open or short circuit fault in the Secondary Air Injection (AIR) pump drive relay circuit will be reported directly by the ECM hardware to the Diagnostic Status Manager (DSM). The strategy will report to the DSM when an AIR fault is present and the DSM will then decide whether to store a fault code and illuminate the MIL lamp.

The electric air pump is situated at the front left side of the engine.

Fig. 2 ECM Interface:

AIR - Insufficient Flow, P 0411

Possible Causes:
- AIR pipe ruptured
- AIR pump permanently off
- AIR pump fault
- AIR pump wiring fault (between pump and relay)
- AIR relay fault
- ECM fault - AIR relay fault

AIR - Switching Valve Open Circuit, P 0413

Possible Causes:
- AIR relay missing or open circuit
- AIR relay harness open circuit or short circuit to battery voltage
- ECM relay driver open circuit
- ECM fault

AIR - Switching Valve Short Circuit, P 0414

Possible Causes:
- AIR relay short circuit
- AIR relay harness short circuit
- ECM relay driver short circuit
- ECM fault

Fig. 1:

Figure 1 above shows a graph of airflow with respect to back pressure.