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Diagnostic Aids

WARNING: This page is about a different car, the 1994 Cadillac Fleetwood. However, it is still accessible from the selected car via links, so may be relevant.

See Code 59 chart to check transmission temperature sensor temperature-to-resistance values. Also, check transmission fluid level.

TEMPERATURE-TO-RESISTANCE VALUES (1)

Temperature °F (°C) Ohms
212 (100) 177
194 (90) 241
158 (70) 467
104 (40) 1459
68 (20) 3520
23 (-5) 12,300
14 (-10) 16,180
0 (-18) 25,000
-4 (-20) 28,680
-22 (-30) 52,700
-40 (-40) 100,700
(1) Measure resistance across sensor terminals.
Fig 1: Code 79 Schematic (Fleetwood) Transmission Fluid Overtemp
G94D31917
Fig 2: Code 79 Flow Chart (Fleetwood) Transmission Fluid Overtemp
G94G35168