Secondary Air Injection System Control A Circuit High
The control circuit A of the secondary air injection system shows a voltage above the calibrated upper threshold. Likely a short to battery voltage or an open in the relay coil/output.
Affected components
- Secondary air pump
- Sai relay
- Sai wiring
Common causes
- High likelihood: Control wire shorted to battery
- Medium likelihood: Open relay coil
- 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.