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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 4L60-E/4L65-E (Service & Replacement) >> Diagnostic Information and Procedures >> DTC P1860: Continuous Open, Short To Ground Or Short To Power In TCC PWM Solenoid Valve Circuit >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 4. This step tests for voltage to the solenoid.
  2. 5. This step tests the ability of the PCM and wiring to control the ground circuit.
  3. 7. This step tests the resistance of the TCC PWM solenoid valve and the automatic transmission wiring harness assembly.
Fig 1: DTC P1860 Diagnosis (Steps 1-6)
G01565749Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P1860 Diagnosis (Steps 7-14)
G01565750Courtesy of GENERAL MOTORS CORP.
Fig 3: DTC P1860 Diagnosis (Steps 15-21)
G01565751Courtesy of GENERAL MOTORS CORP.
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