Intermittent fault

Check the control module and transmission connectors. Check for contact resistance and oxidation.

Check the power supply cable between control module terminal #A57 and speed sensor connector terminal #1. Check for an intermittent short-circuit to supply voltage.

Check the signal cable between control module terminal #A39 and speed sensor connector terminal #2. Check for an intermittent short-circuit to supply voltage.

Remedy as necessary.

Other information: 

• To connect the breakout box, see Connecting the breakout box
• To disconnect the control module, see Transmission control module (TCM), replacing
• For information about signals, see Signal specification
• See Checking wiring and terminals

Fig 2: Identifying Vehicle Speed Sensor (VSS) Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Volts Display

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying Transmission Speed Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Information