Pinpoint Test C: Output Shaft Speed (OSS) Sensors
WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
- C1 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 output shaft speed (OSS) sensor.
- Monitor and record speed.
- Does the OSS match the vehicle speed?
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 C2.
No : GO to C2.
- C2 CHECK OSS SENSOR RESISTANCE
- Remove the transmission control module (TCM).
- Measure the resistance at the transaxle bulkhead electrical connector between pin 19 and 20.
- 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 C3.
No : GO to C4.
- C3 CHECK OSS SENSOR FOR SHORT TO GROUND
- Remove the transmission control module (TCM).
- Measure the resistance at the transaxle bulkhead electrical connector between pin 19 and ground.
- Measure the resistance at the transaxle bulkhead electrical connector between pin 20 and ground.
- 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 C4
No : GO to C4.
- C4 CHECK OSS SENSOR RESISTANCE
- Remove the transmission side cover.
- Measure the resistance at the speed sensor electrical connector between pin 1 and 2.
- Is the resistance less than 5 ohms?
Yes : INSTALL a new internal harness.
No : INSTALL a new transaxle assembly.