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Pinpoint Test F: Output Shaft Speed (OSS) Sensors

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The transmission control module (TCM) is integrated into the mechatronic assembly. If installing a new transaxle or a mechatronic assembly, the TCM will need to be checked and recalibrated (reflashed) to the latest level calibration available.
  1. F1 ELECTRONIC DIAGNOSTICS 
    • Check to make sure the transaxle harness connector is fully seated, pins are fully engaged in connector and in good condition before proceeding.
    • Connect the scan tool.
    • Key in START position.
    • Enter the following diagnostic mode on the scan tool: OSS_SRC (OSSA), OSSB.
    • Monitor and record speed.
    • Do OSS A and OSS B equal each other? 
    1. Yes  : GO to F2.
    2. No  : INSTALL a new OSS sensor.
  2. F2 ELECTRONIC DIAGNOSTICS 
    • Enter the following diagnostic mode on the scan tool: OSS_SRC (OSSA), OSSB.
    • Drive the vehicle and monitor and record speed.
    • Both the OSS A and OSS B should read the same.
    • Do OSS A and OSS B follow the vehicle speed and read the same? 
    1. Yes  : CLEAR all DTCs. ROAD TEST to verify if concern is still present. Concern could be intermittent. If concern is still present or reappears, INSTALL a new mechatronic assembly. (Refer to the note preceding this pinpoint test.)
    2. No  : INSTALL a new OSS sensor.
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