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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Engine Controls - Self-Diagnostics - 6.6L Diesel) >> Diagnostic Tests >> DTC P0108: BARO Sensor Circuit - High Pressure (Ca) >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number in the diagnostic procedures.

  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.

  4. 9

    This step tests the signal circuit of the EGR vacuum 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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