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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Component Check Charts (Trucks) >> Output Speed Sensor Circuit Check - 2WD - "C" & "K" Series >> Diagnostic Aids

Diagnostic Aids

Check all connections, especially those at the transmission pass-thru connector. If the input sensor is not functioning at start up, it will cause the output sensor to read zero. While Code 24 is set, the Scan tester will display an RPM derived from input speed.

Fig 1: Output Speed Sensor Troubleshooting (2WD - "C" & "K" Series)
G91B13699Courtesy of GENERAL MOTORS CORP.
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