Secondary Air Injection System Control A Circuit Low
The control circuit of the secondary air injection system A reads a voltage below specification. Either the relay output is shorted to ground or the wiring/load is faulty.
Affected components
- Secondary air pump
- Sai relay
- Sai wiring
Common causes
- High likelihood: Control wire shorted to ground
- Medium likelihood: Faulty SAI relay
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.