Connecting the Breakout Box, GM Automatic Transmissions

Connecting the breakout box, GM automatic transmissions

Special tools:
951 1505 Adapter 20 pin 951 1505 Adapter 20 Pin
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428

Connecting the breakout box to the automatic transmission connector
- Ignition off
- Remove the air cleaner (ACL) housing. See Brake pipe master cylinder / ABS unit, replacing Brake Pipe Master Cylinder / ABS Unit, Replacing.
Disconnect the automatic transmission connector by pressing the sides of the connector
- Carefully pull the connector straight out
- Check that the male and female terminals are undamaged and secure (cannot be pressed in). Check that the cables to the female terminals are secured to the terminal pins
- In particular, check the terminal pins relevant to the diagnostic trouble code (DTC) / symptom. See Signal specification, 4T65EV-GT Signal Specification
- Connect adapter951 1505 Adapter 20 pin 951 1505 Adapter 20 Pin to the automatic transmission connector (transmission side). Connect breakout box981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to the adapter
- The breakout box is designed to facilitate reading off the control module input and output signals when the control module is connected; and the cable and component resistance when the control module is disconnected. The use of a breakout box reduces the risk of accidental short-circuits and damage to the connector pins.