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Home >> Pontiac >> 2007 >> Grand Prix GXP >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls & Fuel - 3.8L - Diagnosis & Troubleshooting) >> Boost Control System Diagnosis >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Review the vacuum schematics in the Boost Control System Description. Refer to Boost Control System Description .
  2. Ignition OFF, visually and physically inspect the supercharger components for any of the following conditions:

    Inspect the vacuum lines for:

    • Cracking
    • Loose fit
    • Improper connections
    • Improper routing
  3. Inspect the following components for damage, and for proper connections, adjustments, and installation:
    • The bypass valve actuator
    • The boost control solenoid
    • The bypass valve lever
    • The bypass valve cable. Refer to.
  4. Engine running, command the supercharger bypass (SCB) solenoid from 0-90 percent with a scan tool. Observe the operation of the bypass valve. It should move as the DC percentages are varied.
  5. Verify there are no vacuum leaks at the supercharger manifold gaskets and supercharger intake plenum.
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