Pinpoint Test D: Turbine Shaft Speed Sensor

WARNING: This page is about a different car, the 2006 Mercury Montego and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

D1 ELECTRONIC DIAGNOSTICS
- Check to make sure the transmission control module connector is fully seated, pins are fully engaged in connector and in good condition before proceeding.
- Connect the scan tool.
- Key in ON position.
- Monitor the PID for the turbine shaft speed (TSS) sensor.
- Monitor and record speed.
- Does the TSS match the engine rpm?
Yes: CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to D2.

No: GO to D2.
D2 CHECK TSS SENSOR RESISTANCE
- Remove the transmission control module (TCM).
- Measure the resistance at the transaxle bulkhead electrical connector between pin 12 and 13.
  
  Fig 1: Checking TSS Sensor Resistance
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to D3.

No: GO to D4.
D3 CHECK TSS SENSOR CIRCUIT FOR SHORT TO GROUND
- Remove the transmission control module.
D3 CHECK TSS SENSOR CIRCUIT FOR SHORT TO GROUND (Continued)
- Measure the resistance at the transaxle bulkhead electrical connector between pin 12 and ground.
  
  Fig 2: Checking TSS Sensor Circuit For Short To Ground (1 Of 2)
  Courtesy of FORD MOTOR CO.
- Measure the resistance at the transaxle bulkhead electrical connector between pin 13 and ground.
  
  Fig 3: Checking TSS Sensor Circuit For Short To Ground (2 Of 2)
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes: INSTALL a new transmission control module (TCM) and re-flash to the latest level calibration. CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to D4.

No: GO to D4.
D4 ELECTRONIC DIAGNOSTICS
- Remove the transmission side cover.
- Measure the resistance at the TSS speed sensor electrical connector between pin 1 and 2.
- Is the resistance less than 5 ohms?
Yes: CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, INSTALL a new internal harness.

No: The sensor is defective, INSTALL a new TSS sensor.