Secondary Throttle Valve: Testing and Inspection

System Inspection
1. Start the engine and verify that the Actuator (Double Throttle Control) rod is pulled into actuator while engine is cold.
2. If the actuator rod is not pulled, check the following items below:
- Vacuum tube, (Inspect vacuum line fitting, connections and components for leaks)
- Vacuum chamber, (Visually check for clogging, damage or cracks)
- Actuator (Double Throttle Control)
- Solenoid Valve (Double Throttle Control)
- Engine Coolant Temperature Sensor




3. Verify that the actuator rod is returned, when engine reaches normal operating temperature.
4. If the actuator rod does not return, check the following items below:
- Solenoid Valve (Double Throttle Control)
- Engine Coolant Temperature Sensor