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Test Description

WARNING: This page is about a different car, the 1995 Oldsmobile Ninety-Eight and 1995 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Test numbers refer to numbers on diagnostic chart.
  1. Ensures PCM is capable of controlling solenoid.
  2. Checks TCC PWM driver circuit for short to ground.
Fig 1: Code 1860 Schematic (3.8L) TCC PWM Solenoid
G95J13903
Fig 2: Code 1860 Diagnostic Flow Chart (3.8L) TCC PWM Solenoid
G95I13902