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Diagnostic Aids

Check harness routing for a potential short to ground in circuit No. 1227. Scan tool displays transmission fluid temperature in degrees Centigrade. After transmission has been in operation, temperature should rise steadily to about 212°F (100°C) then stabilize. Test transmission sensor at various temperature levels to determine if sensor is out of calibration. See TRANSMISSION SENSOR - TEMP TO RESISTANCE chart. An out-of-calibration sensor could result in delayed shifts or TCC enabled complaint.

Fig 1: DTC 58 Schematic - 1993
G93J76306Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC 58 Flow Chart - 1993
G93A76307Courtesy of GENERAL MOTORS CORP.