Checking The Transmission Output Speed Sensor Signal

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Connector(s) Reinstallation

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Ignition off
Check the control module and transmission output speed sensor connectors. Check for contact resistance and oxidation according to CONTACT RESISTANCE AND OXIDATION
Reinstall the components, reconnect the connectors etc.
Raise the car so that the drive wheels can rotate freely
Engine idling
Gear selector in position D
Read off the transmission output speed signal.
Check that the speed increases with engine speed (RPM). If the speed is updated, the cause of the fault was loose connections in the control module or vehicle speed sensor (VSS) connectors.

NOTE:
A diagnostic trouble code (DTC) may be stored in the ABS system when the rear wheels are stationary and the front wheels rotate. Erase any diagnostic trouble codes (DTCs) in the ABS system after completing fault-tracing.

Other information:
- To access the control module connector, see CONNECTING THE BREAKOUT BOX
- To access the transmission connector, see CONNECTING THE BREAKOUT BOX, GM AUTOMATIC TRANSMISSIONS .
Fig 3: Identifying VCT2000 Diagnostic Tool Symbol In VIDA
Courtesy of VOLVO CARS CORPORATION

Does the speed increase with engine speed (RPM)?