Automatic Transmission Inline 20-Way Connector
Automatic Transmission 20-Way Inline Connector Description
The transmission electrical connector is an important part of the transmission operating system. Any interference with the electrical connection can cause the transmission to set Diagnostic Trouble Codes (DTC) or affect proper operation.
The following items can affect the electrical connection:
^ Bent terminals in the connector from rough handling during connection and disconnection
^ Wires backing away from the pins or coming uncrimped, in either the internal or the external wiring harness
^ Dirt or moisture contamination entering the connector when disconnected
^ Pins in the internal wiring connector backing out of the connector during connection
^ Transmission fluid leaking into the connector, wicking up into the external wiring harness and degrading the wire insulation
^ Low terminal tension in the external connector from excessive connection and disconnection of the wiring connector assembly
^ Terminal corrosion from contamination
^ Damaged connector or connector lock assembly
Remember the following points:
^ In order to disconnect the connector, turn the connector clockwise and pull.
^ Do not pry the connector with a screwdriver or other tool.
^ The connector should screw into place with a positive feel and lock when properly installed.
^ Whenever the transmission external wiring connector is disconnected from the internal harness and the ignition is ON, transmission DTC'S will set. Clear these DTC'S after reconnecting the transmission connector.
Sport Economy Mode Operation
Economy Mode Operation
During economy mode operation, drivers may notice increased powertrain braking after releasing the accelerator pedal. The vehicle will not coast freely when the accelerator pedal is released, but will start to gradually slow down as if the brakes were lightly applied. This feels very similar to what is experienced when releasing the accelerator pedal on a vehicle equipped with a manual transmission.
Sport Mode Operation
The sport mode was designed to simulate the performance driving of a manual transmission equipped vehicle. This means that, given certain driving conditions, the vehicle will maintain specific gears longer than a traditional automatic transmission would. In addition, if a person is driving in the normal mode in fifth gear, depressing the sport button will cause an immediate 5-4 downshift that will be maintained for ten seconds. If the transmission is in any other gear when sport is engaged, no downshift will take place. No attempt should be made to change or alter these operating characteristics.
Winter Mode Operation
The winter mode enables the transmission to start the vehicle moving in third gear. Third gear take-off reduces the torque applied to the rear wheels, which reduces wheel spin during slippery conditions.
To activate the winter mode, press the winter mode switch located next to the transmission gear selector lever. The snowflake icon will illuminate brightly.
Limp Home Mode Description
If a major electrical system failure occurs which could affect vehicle safety or damage the transmission during normal operation, the TCM enters a default mode. In the default mode, the transmission operates in the following manner:
^ The pressure control solenoid is off and the line pressure is at maximum in order to minimize clutch slippage.
^ The TCC solenoid is off. The converter clutch is disabled.
^ All three of the shift solenoids are off. The transmission will operate in fifth gear if the vehicle has successfully completed a 1-2 upshift in the current ignition cycle. If the vehicle has not completed a 1-2 upshift in the current ignition cycle, the transmission will operate in fourth gear. If the transmission is operating in fifth gear, fourth gear may be obtained if the engine is stopped briefly and re-started.
In default mode, the gear selector lever is ineffective at selecting forward gear ranges. In fourth or fifth gear, heat builds up in the transmission quickly, particularly in stop and go traffic. Excessive heat build-up may cause transmission failure if the vehicle is driven for extended distances in default mode.