Checking the wiring

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off.

  Check the wiring between control module terminals #A57 and #A39 and speed sensor connector terminals #1 and #2. Check for a short-circuit to each other.

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

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

  Remedy as necessary.

  Other information 

  • To connect the breakout box, see Connecting the breakout box
  • To connect the breakout box to the transmission connector, see Connecting the breakout box, GM automatic transmissions
  • To check or replace the transmission output speed sensor, see Transmission output speed sensor, 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.

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  Refer to Checking the control module