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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transaxle/Transmission - AISIN Aw21) >> Diagnostic Tests >> Pinpoint Tests - Non OSC Equipped Vehicle >> Pinpoint Tests >> PINPOINT TEST C: Output Shaft Speed (OSS) SENSORS

PINPOINT TEST C: Output Shaft Speed (OSS) SENSORS

WARNING: This page is about a different variant/trim than selected.
  1. C1 ELECTRONIC DIAGNOSTICS 
    • Check to make sure the Transmission Control Module (TCM) connector is fully seated, pins are fully engaged in the connector and in good condition before proceeding.
    • Connect the diagnostic 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? 
    1. 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 .
    2. NO  : Go to  C2.
  2. C2 CHECK OSS SENSOR RESISTANCE 
    • Remove the TCM.
      • Fig 1: Checking OSS Sensor Resistance
      GF0017761Courtesy of FORD MOTOR CO.
    • Measure the resistance at the transaxle bulkhead electrical connector between pin 19 and 20.
    • Is the resistance less than 5 ohms? 
    1. 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 .
    2. NO  : Go to  C4.
  3. C3 CHECK OSS SENSOR FOR SHORT TO GROUND 
    • Remove the TCM.
      • Fig 2: Measuring Resistance At Transaxle Bulkhead Electrical Connector Between Pin 19 & Ground
      GF0017762Courtesy of FORD MOTOR CO.
    • Measure the resistance at the transaxle bulkhead electrical connector between pin 19 and ground.
      • Fig 3: Measuring Resistance At Transaxle Bulkhead Electrical Connector Between Pin 20 & Ground
      GF0017763Courtesy of FORD MOTOR CO.
    • Measure the resistance at the transaxle bulkhead electrical connector between pin 20 and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new TCM and REFLASH 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 .
    2. NO  : Go to  C4.
  4. C4 CHECK OSS SENSOR RESISTANCE 
    • Remove the transaxle side cover.
      • Fig 4: Checking OSS Sensor Resistance
      GF0017764Courtesy of FORD MOTOR CO.
    • Measure the resistance at the speed sensor electrical connector between pin 1 and 2.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new internal harness.
    2. NO  : INSTALL a new transaxle assembly.
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