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.

1. Checks for out-of-calibration sensor or shorted circuit.
2. Simulates Code 59.