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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P1860: TCC PWM Solenoid Circuit - Electrical Malfunction >> Test Description

Test Description

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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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