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Home >> Chevrolet >> 2012 >> Tahoe PPV >> Repair and Diagnosis >> External Pages >> Different car >> Section 1327 (Antilock Brake System - Non-Hybrid Less Than 3900 Kg (8600 Lb) GVW) >> Diagnostic Information and Procedures >> DTC C1100 >> Circuit/System Testing >> Only DTC C1100 Set

Only DTC C1100 Set

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor.
  2. Wait for 60 seconds, test for less than 11 Ω between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
  3. Ignition ON, test for 4.8 - 5.2 V between the 5 V reference circuit terminal 3 and ground.
    • If less than the specified range, test the 5 V reference circuit for an open/high resistance. If the circuit tests normal, replace the replace the EBCM.
    • If greater than the specified range, test the 5 V reference circuit for a short to B+. If the circuit tests normal, replace the EBCM.
  4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 3 and the signal circuit terminal 1.
    • If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
    • If greater than the specified range, test the signal circuit for a short to B+. If the circuit tests normal, replace the EBCM.
  5. Ignition OFF, disconnect the harness connector at the EBCM.
  6. Test for infinite resistance between the signal circuit terminal 1 and ground.
    • If not the specified value, test the signal circuit for a short to ground.
  7. If all circuits test normal, test or replace the brake booster vacuum sensor.
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