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Home >> Buick >> 1995 >> Riviera 3.8 1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.8L >> ECM/Pcm Code Charts >> Code P1860: TCC PWM Solenoid >> Circuit/System Testing

Circuit/System Testing

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 P1860 Schematic (3.8L) TCC PWM Solenoid
G95J13903
Fig 2: Code P1860 Diagnostic Flow Chart (3.8L) TCC PWM Solenoid
G95I13902
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