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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 (Automatic Transmission - ALLISON - Diagnosis) >> Diagnostic Tests >> DTC P1571: TCS PWM Circuit No Frequency (8.1L) >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 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 on the diagnostic table:

  1. 3  - The test lamp will not illuminate if there is an open circuit or a short to battery voltage.
  2. 4  - This step determines if the circuit is shorted to ground.
  3. 5  - This step determines if the problem is a short to battery voltage or open. If the circuit is open there may be some AC frequency, but the frequency will be below 100 Hz. A short to battery voltage will have a frequency near 200 Hz.
  4. 6  - This step determines if the circuit is shorted to battery voltage.

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