Code 79, Transmission Fluid OVERTEMP: Notes
PCM supplies and monitors a 5-volt reference to sensor. As transmission temperature changes, sensor resistance changes, affecting monitored voltage. When fluid is cold, resistance is high, resulting in a high monitored voltage.When fluid is hot, resistance is low, resulting in a low monitored voltage.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks for out-of-calibration sensor or shorted circuit.
- Simulates Code 59.