Pinpoint Test F: Turbine Shaft Speed Sensors

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

NOTE: Refer to the TURBINE SHAFT SPEED (TSS) SENSOR HARNESS CONNECTOR illustration preceding these pinpoint tests.

F1 ELECTRONIC DIAGNOSIS
- With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING .
- Check to make sure the transmission harness connector is fully seated, pins are fully engaged in connector and in good condition before proceeding.
- Connect the scan tool.
- Key in ON position.
- Enter the following diagnostic mode on the scan tool: Diagnostic Data Link.
- Enter the following diagnostic mode on the scan tool: PCM.
- Select PID/Data Monitor and Record
- Select the PID TSS.
- Does vehicle enter PID/Data Monitor and Record?
Yes : GO to F2.

No : REPEAT procedure to ENTER PID. If vehicle did not enter PID, REFER to the INTRODUCTION - GASOLINE article for diagnosis of PCM. If equipped with fire suppression system, GO to F4.
F2 DRIVE CYCLE TEST
- While monitoring the TSS Speed PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
- Does the TSS Speed PID increase and decrease with engine and vehicle speed?
Yes : CLEAR all DTC's. ROAD TEST to verify if the concern is still present. If concern is still present, REFER to DIAGNOSIS BY SYMPTOM . If equipped with fire suppression system, GO to F4.

No : If the TSS Speed PID does not increase and decrease with engine and vehicle speed, INSPECT for open or short in vehicle harness, sensor, or a PCM concern or internal hardware concern. GO to F3.
F3 CHECK THE PCM HARNESS FOR OPENS
- Disconnect: PCM.
- Disconnect: TSS Sensor.
- Measure the resistance between PCM pin 15 and TSS connector pin 1 harness side.
  
  Fig 1: Measuring Resistance Between PCM Pin 15 And TSS Connector Pin 1 Harness Side
  Courtesy of FORD MOTOR CO.
- Measure the resistance between PCM pin 43 and TSS connector pin 2 harness side.
  
  Fig 2: Measuring Resistance Between PCM Pin 43 And TSS Connector Pin 2 Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to F4.

No : REPAIR the circuit. TEST the system for normal operation.
F4 CHECK THE PCM HARNESS FOR SHORT TO GROUND
- Disconnect: PCM.
- Disconnect: TSS Sensor.
- Measure the resistance between PCM pin 15 and chassis ground.
  
  Fig 3: Measuring Resistance Between PCM Pin 15 And Chassis Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes : GO to F5.

No : REPAIR the circuit. TEST the system for normal operation.
F5 CHECK RESISTANCE OF TSS SENSOR
- Disconnect the vehicle harness from the TSS sensor.
- Measure the resistance between the TSS sensor pins.
  
  Fig 4: Measuring Resistance Between TSS Sensor Pins
  Courtesy of FORD MOTOR CO.
- Record the resistance.
- Is the resistance within 480-590 ohms?
Yes : REFER to DIAGNOSIS BY SYMPTOM for concern diagnosis. If equipped with fire suppression system, GO to F6.

No : INSTALL a new TSS Sensor. If equipped with fire suppression system, GO to F6.
F6 REPOWER THE FIRE SUPPRESSION SYSTEM
- Verify that the fire suppression system is repowered. Refer to FIRE SUPPRESSION SYSTEM .
- Is the fire suppression system repowered?
Yes : Fire suppression system repowering is complete.

No : REFER to FIRE SUPPRESSION SYSTEM for fire suppression system depowering and repowering procedure.