Pinpoint Test F: Intermediate Shaft Speed Sensor And Output Shaft Speed (OSS) Sensor

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

NOTE: Refer to Figure .

F1 ELECTRONIC DIAGNOSTICS SETUP
- Check to make sure the transaxle harness connectors are fully seated, terminals 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: TCM.
- Select Trans Priority.
- Select PID/Data Monitor and Record.
- Select the intermediate shaft speed or OSS sensor PID.
- Does vehicle enter PID/Data Monitor and Record?
Yes : REMAIN in PID/Data. GO to F2.

No : REPEAT procedure to ENTER PID. If vehicle did not enter PID, REFER to the INTRODUCTION - GASOLINE article for diagnosis of TCM.
F2 DRIVE CYCLE TEST
- While monitoring the appropriate sensor PID, drive the vehicle so that the transaxle upshifts and downshifts through all gears.
- Does the intermediate shaft speed or OSS sensor PID increase and decrease with engine and vehicle speed?
Yes : GO to F3.

No : If the intermediate shaft speed or OSS sensor PID does not increase and decrease with engine and vehicle speed, INSPECT for open or short in vehicle harness, sensor, a TCM concern, or internal hardware concern. GO to F4.
F3 DRIVE CYCLE TEST ERRATIC
- While monitoring the appropriate sensor PID, drive the vehicle so that the transaxle upshifts and downshifts through all gears.
- Is the intermediate shaft speed or OSS sensor PID signal erratic (drop to zero or near zero and return to normal operation)?
Yes : If the sensor signal is erratic, INSPECT for intermittent concern in the harness, sensor or connector. GO to F4.

No : CLEAR all DTCs. Rerun OBD.
F4 CHECK SENSOR BATTERY SUPPLY CIRCUIT FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Intermediate Shaft Speed Sensor C193.
- Disconnect: OSS Sensor C1088.
- Disconnect: TCM C2352a.
- For intermediate shaft speed sensor, measure the resistance between sensor C193-3, harness side and ground.
- For OSS, measure the resistance between OSS sensor C1088-3, harness side and ground.
  
  Fig 1: Checking Sensor Battery Supply Circuit For Short To 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 SENSOR BATTERY SUPPLY CIRCUIT FOR AN OPEN
- For intermediate shaft speed sensor, measure the resistance between intermediate shaft speed sensor C193-3, harness side and TCM C2352a-10.
- For OSS sensor, measure the resistance between OSS sensor C1088-3, harness side and TCM C2352a-10.
  
  Fig 2: Checking Sensor Battery Supply Circuit For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to F6.

No : REPAIR the circuit in question. TEST the system for normal operation.
F6 CHECK GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between intermediate shaft speed sensor C193-1 or OSS sensor C1088-1, harness side and ground.
  
  Fig 3: Checking Ground Circuit For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to F7.

No : REPAIR the sensor ground circuit. TEST the system for normal operation.
F7 CHECK SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
- For intermediate shaft speed sensor, measure the resistance between intermediate shaft speed sensor C193-2, harness side and ground.
- For OSS sensor, measure the resistance between OSS sensor C1088-2, harness side and ground.
  
  Fig 4: Checking Sensor Signal Circuit For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes : GO to F8.

No : REPAIR the circuit in question. TEST the system for normal operation.
F8 CHECK SENSOR SIGNAL CIRCUIT FOR A SHORT TO POWER
- For intermediate shaft speed sensor, measure the voltage between intermediate shaft speed sensor C193-2 and ground.
- For OSS sensor, measure the voltage between OSS sensor C1088-2, harness side and ground.
  
  Fig 5: Checking Sensor Signal Circuit For Short To Power
  Courtesy of FORD MOTOR CO.
- Is there voltage?
Yes : REPAIR the circuit in question. TEST the system for normal operation.

No : GO to F9.
F9 CHECK SENSOR SIGNAL CIRCUIT FOR AN OPEN
- Disconnect: TCM C2352b.
- For intermediate shaft speed sensor, measure the resistance between intermediate shaft speed sensor C193-2, component side and TCM C2352b-19.
- For OSS sensor, measure the resistance between OSS C1088-2, component side and TCM C2352b-17.
  
  Fig 6: Checking Sensor Signal Circuit For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to F10.

No : REPAIR the circuit in question. TEST the system for normal operation.
F10 CHECK FOR VOLTAGE AT SENSOR
- Connect: TCM C2352a.
- Connect: TCM C2352b.
- Key in ON position.
- Measure the voltage between intermediate shaft speed sensor C193-2, harness side and ground, or OSS sensor C1088-2, harness side and ground.
  
  Fig 7: Checking For Voltage At Sensor
  Courtesy of FORD MOTOR CO.
- Is the voltage approximately 5 volts?
Yes : INSTALL a new sensor. TEST the system for normal operation.

No : INSTALL a new TCM. TEST the system for normal operation.