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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 476 (Antilock Brake System - Hybrid (Hp2)) >> Diagnostic Information and Procedures >> DTC C0299 or C12FF >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

The battery must be able to maintain a charge during this procedure. It is recommended that a charger/maintainer or equivalent be used to maintain proper battery voltage during this procedure.

  1. Verify that no other EBCM DTCs are set.
  2. Ignition ON, engine OFF, using a scan tool access the EBCM, Module Setup screen, and perform the EBCM Relearn. The relearn procedure will verify valve and pressure sensor calibrations are correct.
    3. NOTE:

    To ensure the complete brake modulator and high pressure accumulator pressure relief procedure is allowed to occur; the brake controller must see one brake pedal apply with the engine running followed by a proper shutdown without applying the brake pedal.

  3. Transmission in PARK, engine running, apply and release the brake pedal.
    4. NOTE:

    The ignition must transition to the OFF position without pausing at ACCESSORY and without applying the brake pedal. This ensures that the brake modulator and high pressure accumulator pressure relief occurs. This process will take approximately 1-2 minutes.

  4. Ignition OFF, key removed from the ignition, wait 2 minutes.
    5. NOTE:

    The ignition must remain in the ON position with the engine OFF during the following steps.

  5. Ignition ON, brake pedal released, verify the following EBCM scan tool parameters are within the specified range:
    • BMC Prim. Piston Pos. Sen. 5 V Reference Position - Between 4.75-5.25 V
    • BMC Primary Piston Position Sensor A - Between 0.4-0.8 V
    • BMC Primary Piston Position Sensor B - Between 4.2-4.6 V
  6. Brakes not applied, verify the following EBCM scan tool parameters are within the specified range:
    • Master Cylinder Pressure Sensor Input - Less than 100 kPa (15 psi)
    • Rear Brake Pressure Sensor - Less than 100 kPa (15 psi)
    • Brake Pressure Sensor Input - Less than 100 kPa (15 psi)
    • Accum. Pressure Sensor - Less than 800 kPa (116 psi)
      • If any of the parameters are not within the specified range, replace the brake pressure modulator valve.
  7. Perform a hydraulic check, refer to Brake Hydraulic and Assist System Diagnosis (Two-mode Hybrid) .
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