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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 P0234: TC Engine OVERBOOST Condition (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 numbers below refer to the step numbers in the diagnostic procedures.

  1. 3

    With the ignition ON and the engine OFF, the BARO sensor and the boost sensor should indicate the current barometric pressure. A significant difference between the readings indicates an electrical fault.

  2. 5

    This step tests the wastegate actuator diaphragm for a leak.

  3. 6

    This step tests the wastegate actuator, the linkage, and the wastegate for proper operation.
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