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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 77 (Engine Controls Self-Diagnostics - 5.0L & 5,7L) >> Diagnostic Tests >> DTC P0719: Brake Switch Circuit - Low Input (4L80-E Transmission) >> Test Description

Test Description

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The numbers below refer to the step numbers in the diagnostic procedures.

  1. 4

    This step tests for TCC Brake switch voltage to the PCM connector.

  2. 7

    This step isolates the TCC Brake switch as a source for setting the DTC.

  3. 10

    This step tests for a short to ground in the voltage circuit (CKT 441) to the TCC Brake switch.

  4. 12

    This step tests for a short to ground in the TCC Brake switch circuit (CKT 420), from the TCC Brake switch to the PCM.

  5. 13

    This step isolates the PCM as a source for causing the fuse to open.
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