Circuit/System Verification
- Review the vacuum schematics in the Boost Control System Description. Refer to Boost Control System Description .
- 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
- 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 Supercharger Cleaning and Inspection .
- Verify that the charge air cooler (CAC) coolant level is full.
- Ignition ON, command the CAC coolant pump ON and OFF with a scan tool. Listen for the CAC coolant pump to turn ON and OFF with each command.
- If the CAC coolant pump does not turn ON and OFF refer to Supercharger Intercooler Relay Diagnosis .
- Engine running, command the supercharger bypass (SCB) solenoid from 0 to 90% with a scan tool. Observe the operation of the bypass valve, it should move as the DC percentages are varied.
- Verify there are no vacuum leaks at the supercharger manifold gaskets and supercharger intake plenum.