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Automatic Transmission – 4L60E – General Information Page 7C1–8 2.4 System Protection Devices Should 1st gear be selected and left in that range, the TCM will protect the engine from an over-speeding condition by Under severe operating conditions such as towing in high ambient temperatures, fluid temperatures can rise to a point When fluid temperatures in excess of 135 °C are sensed, the torque converter clutch is applied as programmed, in 3rd or 4th gear. This action reduces further the fluid temperature during normal operation of the torque converter. While these Similarly, when the fluid temperature is below 29 °C, the TCM prevents torque converter clutch apply. If a condition occurs, preventing electronic control of the transmission's functions, a 'Fail Safe' mode will default the 2.5 Self Diagnosis If any transmission operation controlled by the TCM begins to operate outside its pre-set parameters, the TCM has the 2.6 TCM Sensors and Actuators As indicated earlier, there are a number of sensors and switches providing input information for the TCM programming The TCM does this by comparing this input information with its predetermined values on shift pattern, fluid pressure In addition, each input signal and output actuator operation is also monitored and if outside its pre-set parameters, a |