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Home >> Chevrolet >> 1995 >> Corvette Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> ECM/Pcm Code Charts >> Code 42, Ic Circuit Grounded >> Test Description
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Test Description

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. If engine starts, code is intermittent.
  2. This test checks for an IC signal from PCM to ignition coil driver.
  3. Remaining tests check driver circuitry. Because coil driver gets its power from coil, check ignition coil feed circuit to ignition coil for opens.
Fig 1: Code 42 Schematic (Corvette) IC Circuit Grounded
G95I13928
Fig 2: Code 42 Diagnostic Flow Chart (Corvette) IC Circuit Grounded
G92A04338