The TCM gathers the vehicle operating information from
the various sensors and controls listed below. The various sensors and controls
are both internal and external to the transmission. The TCM processes this
information and controls the following solenoids:
| • | Transmission shift points through the shift solenoids |
| • | Transmission shift feel through the force motor solenoid |
| • | TCC apply and release timing through the TCC control solenoid |
| • | The brake band apply through the PWM band apply solenoid |
Electronic control of these transmission operating characteristics provides
consistent and precise shift points and shift quality based on the operating
conditions of both the engine and the transmission.
Transmission Electrical Connectors
The transmission electrical connectors are a very important part of the transmission
operating system. Any interference with the electrical connections can cause
the transmission to set the Diagnostic Trouble Codes (DTCs) and/or affect
proper operation.
The following items can affect the electrical connections:
| • | Bent pins in the connector from rough handling during connection
and disconnection. |
| • | Wires backing away from the pins or coming uncrimped (in either
the internal or external wiring harness). |
| • | Dirt contamination entering the connector when disconnected. |
| • | Pins in the internal wiring connector backing out of the connector
or pushed out during reconnection. |
| • | Excessive transmission fluid leaking into the connector, wicking
up into the external wiring harness, and degrading the wire insulation. |
| • | Water/moisture intrusion into the connector. |
| • | Low pin retention from the external connector from excessive connection
and disconnection of the wiring connector assembly. |
| • | Pin corrosion from contamination. |
| • | Broken/cracked connector assembly. |
Points to remember when working with the transmission wiring connectors:
| • | In order to remove a connector: |
| 1. | Release the locking tang and pull the connector straight out. |
| 2. | Carefully limit twisting or wiggling the connectors during removal.
Bent pins can occur. |
| 3. | Do Not pry the connectors off with a screwdriver or other tool. |
| • | In order to reinstall a connector: |
| 1. | Be certain that both halves of the connector are free of dirt
or other contaminants. |
| 2. | Line up the connector with the mating half and push the connector
straight in until the locking tang catches. |
| 3. | Whenever the transmission external wiring connectors are disconnected
from the internal harness and the engine is operating, the DTCs will set.
Clear these DTCs after reconnecting the external connectors. |
