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Home >> Chevrolet >> 1992 >> APV >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Gasoline >> Trouble Codes >> Code 31, Park/Neutral Switch Circuit 3.8L >> Diagnostic Aids
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Diagnostic Aids

Check for poor connections or damaged harness. Monitor scan tester status for gear selector switch while wiggling harness.F

Fig 1: Code 31, Schematic, Park/Neutral Switch Circuit 3.8L
G92H21789Courtesy of GENERAL MOTORS CORP.
Fig 2: Code 31, Flow Chart, Park/Neutral Switch Circuit 3.8L
G92A21790Courtesy of GENERAL MOTORS CORP.