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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 477 (Hydraulic Brake System) >> Diagnostic Information and Procedures >> DTC C1100 >> Circuit/System Testing

Circuit/System Testing

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NOTE:

If only DTC C1100 is set refer to Only DTC C1100 Set, if both DTC C0710 and C1100 are set, refer to Both DTC C0710 and C1100 Set.

Only DTC C1100 Set

  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.

Both DTC C0710 and C1100 Set

  1. Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor and the steering angle sensor.
  2. Ignition ON, test for 4.8 - 5.2 V between the 5 V reference circuit terminals listed below and ground.
    • Terminal 3 at the brake booster vacuum sensor
    • Terminal 1 at the steering angle sensor
      • If less than the specified range, test both 5 V reference circuits for a short to ground. If the circuit tests normal, replace the EBCM.
      • If greater than the specified range, test both 5 V reference circuits for a short to voltage. If the circuits test normal, replace the EBCM.
  3. If all circuits test normal, test or replace the brake booster vacuum sensor or steering angle sensor as required.
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