Variable Induction Control Valve: Testing and Inspection
Intake Air Bypass Control Valve TestSpecial Tools Required:
Vacuum pump gauge, 0 - 30 in.Hg
A973X-041-XXXXX
1. Start the engine, and let it idle.
NOTE: The engine coolant temperature must be below 104 °F (40 °C).
2. Remove the vacuum hose (A) from the intake pipe, and connect a vacuum gauge to the hose.
3. Raise and lower the engine speed, and make sure the vacuum gauge reading changes as the rpm changes.
If the vacuum reading does not change, check for these problems:
- Misrouted, leaking, broken, or clogged intake air bypass control system vacuum lines.
- A cracked or defective intake air bypass control valve.
4. Hold the engine at 3,000 rpm with no load (transmission in Park or neutral position) until the radiator fan comes on, then let it idle.
5. Raise and lower the engine speed, and make sure the vacuum gauge reading does not change as the rpm changes.
If the vacuum reading changes check for these problems:
- Misrouted, leaking, broken, or clogged intake air bypass control system vacuum lines.
- A cracked or defective intake air bypass control valve.