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Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 23 other vehicles, including the 1991 GMC Vandura Special, 1991 GMC Vandura, 1991 GMC Value Van, 1991 GMC Suburban, and 1991 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.

Check all connectors. If code is intermittent, see INTERMITTENTS in TESTS W/O CODES article in this section.

Fig 1: Input Speed Sensor Ckt. Check Schematic
G91G13702
Fig 2: Input Speed Sensor Ckt. Check Flow Chart
G91H13703
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