Diagnostic Aids

Check all connections, especially at the transmission pass-thru connector. If code is intermittent, see INTERMITTENTS in TESTS W/O CODES article.

Fig 1: Output Speed Sensor Circuit Check, Schematic, (4WD)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Output Speed Sensor Circuit Check, Flow Chart, (4WD)

Courtesy of GENERAL MOTORS CORP.