LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2006 >> STS V >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - 4.4L - Troubleshooting & Diagnosis >> Boost Control System Diagnosis >> Component Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Component Testing

  1. Ignition OFF, disconnect the inlet vacuum signal hose from the top of the bypass valve actuator.
  2. Connect J 35555  to the inlet vacuum signal port at the bypass valve actuator.
  3. Slowly apply 15 inch Hg of vacuum while observing the bypass valve actuator. The bypass valve actuator and cable should retract.
    • If the bypass valve actuator and cable do not retract, inspect the bypass valve and bypass valve actuator linkage for binding, sticking, or damage. If the bypass valve, cable, and linkage operate normally, replace the bypass valve actuator.
  4. Connect the inlet vacuum signal hose to the top of the bypass valve actuator.
  5. Disconnect the boost signal hose from the bottom of the bypass valve actuator, and connect J 35555  to the boost signal port on the bypass valve actuator.
  6. Start and idle the engine in park.
  7. Slowly apply vacuum until you reach 20 inch Hg, and observe the bypass valve actuator. The bypass valve actuator should extend.
    • If the bypass valve actuator does not extend, inspect the bypass valve and linkage for binding, sticking, or damage. If the bypass valve and linkage operate normally, replace the bypass valve actuator.
scientia non olet · About LEMON Manuals