LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Hydraulic Brake System) >> Diagnostic Information and Procedures >> DTC C027B >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that the brake booster vacuum system has no damage, leakage or incorrect installation.
    • Go to next step: If no damage, leakage or incorrect installation is found 
  2. Ignition ON.
  3. Verify the brake booster pump motor turns ON and OFF when commanding the brake booster electric vacuum pump ON and OFF with a scan tool.
    • If the brake booster pump motor does not turn ON and OFF 

      Refer to Circuit/System Testing.

    • Go to next step: If the brake booster pump motor turn ON and OFF 
  4. All OK.
scientia non olet · About LEMON Manuals