Transmission Fluid Temperature (TFT) Sensor
The TFT sensor is installed in the transmission case, it constantly monitors the fluid temperature resistance varies with fluid temperature.
Automatic transmission internal operational resistance varies with automatic transmission fluid temperature change. The TCM detects the automatic transmission fluid temperature according to the voltage produced by the TFT sensor.
Transmission Fluid Temperature Sensor
The TFT sensor is installed in the transmission case, it constantly monitors the fluid temperature. The sensor resistance varies with automatic TFT change. The TCM detects the automatic TFT according to the voltage produced by the TFT sensor.
The sensor monitor checks to ensure that the TFT is within its upper and lower limits. When the vehicle speed exceeds 12.4 mph (indicating that the transmission is functioning), the temperature is checked against its upper and lower limits. If the fluid temperature is outside the limits, a timer is started. If at the end of the timed period the TFT is still outside of its threshold values then the failure is flagged. If the failure is detected on two consecutive drive cycles, the DTC is logged.
Scheme 40
Check Fluid Level & Condition
| CAUTION | The vehicle should not be driven if the fluid level is low as internal failure can result. |
Note. The transmission oil temperature must not be allowed to exceed 40°C while checking level. Should the temperature rise above this figure, abort the check and allow the transmission oil to cool to below 30°C.
This vehicle is not equipped with a fluid level indicator. An incorrect level may affect the transmission operation and could result in transmission damage. To correctly check and add fluid to the transmission, refer to TRANSMISSION FLUID LEVEL CHECK .
High Fluid Level
A fluid level that is too high may cause the fluid to become aerated due to the churning action of the rotating internal parts. This will cause erratic control pressure, foaming, loss of fluid from the vent tube and possible transmission damage. If an overfill reading is indicated, refer to TRANSMISSION FLUID LEVEL CHECK .
Low Fluid Level
A low fluid level could result in poor transmission engagement, slipping, or damage. This could also indicate a leak in one of the transmission seals or gaskets. Refer to TRANSMISSION FLUID LEVEL CHECK .
Adding Fluid
| CAUTION | The use of any other type of transmission fluid than specified can result in transmission damage. |
If fluid needs to be added, add fluid in 0.50 liter increments through the fill hole opening. Do not overfill the fluid. For fluid type, refer to the General Specification chart in this section. Refer to TRANSMISSION FLUID LEVEL CHECK .
Fluid Condition Check
- Check the fluid level. Refer to «TRANSMISSION FLUID LEVEL CHECK»(ref-173120-S42813158032005031000000) .
- Observe the color and the odor. The color under normal circumstances should be reddish, not brown or black.
- Allow the fluid to drip onto a facial tissue and examine the stain.
- If evidence of solid material is found, the transmission fluid pan should be removed for further inspection.
Note. Being thermostatically controlled, the lubrication system cannot be completely flushed. In the event of a transmission unit replacement for internal failure, the oil cooler and pipes must also be replaced.