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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1807 (Hydraulic Brake System) >> Diagnostic Information and Procedures >> DTC C1101-C1103 or P0556-P0558 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Verify that the engine is in good mechanical condition before continuing with this diagnostic.
  1. If P0641 or P0651 are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  2. Verify the integrity of the entire air induction system by inspecting for the following conditions:
    • Any damaged components
    • Loose or improper installation
    • An air flow restriction
    • Any vacuum leak
    • Improperly routed vacuum hoses
    • In cold climates, inspect for any snow or ice buildup.
  3. Verify that restrictions do not exist in the brake booster sensor port or vacuum source.
  4. Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust .
  5. A skewed brake booster sensor will also cause the intake manifold models to disagree with the actual MAP sensor measurements. Use the scan tool and compare the MAP and brake booster Sensor parameter to a known good vehicle, under various operating conditions.
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