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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Automatic Transmission Diagnosis - ALLISON) >> Diagnostic Tests >> DTC P1571: TCM Torque Request Circuit (8.1L) >> 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 listed below refer to step numbers in the diagnostic procedure:

  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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