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Home >> Chevrolet >> 1992 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Transmission >> Component Check Charts >> Code 59, Transmission Temp. Sensor CKT (Low Temp. Indicated) >> Notes
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Code 59, Transmission Temp. Sensor CKT (Low Temp. Indicated): Notes

The transmission temperature sensor is a thermistor which controls signal voltage to PCM/TCM. The PCM/TCM applies and monitors 5 volts to the sensor on circuit No. 1227. When transmission is cold, sensor resistance is high; therefore, the PCM/TCM will see high signal voltage. As transmission temperature warms up, sensor resistance and voltage drop. At normal transmission operating temperature of 212°F (100°C), voltage will be about 1.5-2.0 volts.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Code 59 will set if signal voltage indicates a transmission temperature less than -54°F (-48°C) for one second.
  2. This test simulates Code 58. If PCM/TCM recognizes the low signal voltage (high temperature) and scan tester reads 304°F (151°C) or greater, the PCM/TCM and wiring are okay.
  3. This test determines if circuit No. 1227 is open. There should be 5 volts present at the sensor connector if measuring with a DVOM.
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