where to put transmission oil temp gauge install 1988 f150

• 2022-05-23

1. Installation position and function of transmission oil temperature sensor.

The transmission oil temperature sensor is installed on the valve plate in the oil pan of the automatic transmission. It is used to detect the temperature of the hydraulic oil of the automatic transmission for shift control, oil pressure control and locking as an electronic control unit

2.Structure and working principle of transmission oil temperature sensor.

Inside the transmission oil temperature sensor is a negative temperature coefficient semiconductor thermistor. The higher the temperature, the lower the resistance. The characteristic curve of its resistance changing with temperature is shown in the negative temperature in the coolant temperature sensor degree coefficient is the characteristic of thermistor. The computer measures the temperature of the hydraulic oil of the automatic transmission according to the change of its resistance.

Symptoms of transmission oil temperature sensor failure

The function of the transmission oil temperature sensor is to detect the temperature of the hydraulic oil of the automatic transmission with dry, which can be used as the basis for the shift control, oil pressure control and lockup clutch control of the electronic control unit. The automatic transmission oil temperature sensor is installed on the control valve to control the high temperature of the transmission. If the transmission oil temperature sensor is broken, it will not detect the temperature of the transmission oil, so it will not be able to provide the oil temperature signal to the transmission computer, which may lead to the shift impact of the transmission. When the transmission oil temperature is higher than 150 ℃, the torque converter immediately enters the locking working condition. If the transmission oil temperature does not drop after 30s, the torque converter will release the locking working condition and the transmission will exit the overspeed gear. If the oil temperature sensor itself or the harness is short circuited, the data flow will show that the transmission oil temperature is higher than 150 ℃, so after the oil temperature sensor itself or the harness is short circuited, the torque converter will not enter the locking working condition, the transmission will not have overspeed gear, and the car will not have high speed. Influence of signal failure.

1) The torque converter lockup clutch has no adjustment operation and can only be opened or closed; There is no adaptive shift pressure, which usually makes it difficult to shift.

2) The negative temperature coefficient (NTC) thermistor of transmission oil temperature sensor G93 has a characteristic relationship.

3) As the temperature increases, the sensor resistance decreases.

4) In order to prevent the transmission from overheating, the corresponding countermeasures are triggered when the defined transmission oil temperature range is exceeded.

5) Countermeasure 1 (about 127 ℃): using the dynamic shift program (DSP) function, the shift characteristic curve shifts at a higher speed. The torque converter lockup clutch is closed earlier and is no longer adjusted.

6) Countermeasure 2 (about 150 ℃): reduce the engine torque.