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Home >> Chevrolet >> 1990 >> Step Van 7.4 N, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - Torque Converter Clutch >> Diagnostic Charts >> Chart C-1A, Park/Neutral Switch >> 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, P/N Switch Flowchart
GB0044466
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