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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Engine Controls - Self-Diagnostics - 6.6L Diesel) >> Diagnostic Tests >> DTC P0108: BARO Sensor Circuit - High Pressure (Fed) >> Test Description

Test Description

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  1. 4

    A short to voltage on the 5-volt reference circuit will cause DTC P1639 to set.

  2. 7

    This step tests the signal circuit of the BARO sensor for a short to voltage. The short may backfeed through the sensor to the 5- volt reference circuit causing the DTC P1639 to set.

  3. 8

    This step tests the signal circuit of the boost sensor for a short to voltage. The short may backfeed through the sensor to the 5-volt reference circuit causing the DTC P1639 to set.
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