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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Antilock Brake System, Traction Control System & Stability Control System) >> Diagnostic Information and Procedures >> DTC C1100 or C1101 >> Circuit/System Testing
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Circuit/System Testing

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  1. Ignition OFF, disconnect the 3 way harness connector at the brake booster vacuum sensor.
  2. Test for less than 1.0 ohm of resistance between the low reference circuit terminal 2 and ground.
    • If greater than 1.0 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
  3. Ignition ON, test for 4.5 - 5.3 volts between the 5-volt reference circuit terminal 3 and ground.
    • If less than 4.5 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
    • If greater than 5.3 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  4. Test for 4.5 - 5.3 volts between the 5-volt 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 specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  5. If all circuits test normal, test or replace the brake booster vacuum sensor.
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