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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Park/Neutral Switch Test (Trucks) >> Chart C-1A, Park/Neutral Switch - Light Trucks & Vans >> Diagnostic Aids

Diagnostic Aids

If circuit No. 434 indicates Park/Neutral switch grounded while in Drive, EGR would be inoperative, resulting in possible detonation.

If circuit No. 434 always indicates Drive (open), a drop in idle may exist when gear selector is moved into Drive.

Fig 1: Chart C-1A, Park/Neutral Switch Troubleshooting (Lt. Trucks & Vans)
G92C13732Courtesy of GENERAL MOTORS CORP.
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