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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Automatic Transmission Diagnosis - 4L80-E) >> Diagnostic Tests >> DTC P1860: TCC PWM Solenoid Circuit - Electrical Malfunction >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 Chevrolet Suburban, and 2002 Chevrolet 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. 4

    This step tests for voltage to the TCC PWM solenoid valve circuit at the transmission in-line 20-way harness connector.

  2. 6

    This step tests the ability of the PCM and wiring to control the ground circuit.

  3. 8

    This step tests the resistance of the TCC PWM solenoid valve and the internal wiring harness.

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