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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1410 (Automatic Transmission - FNR5) >> Diagnostic Tests >> Pinpoint Tests - OSC Equipped Vehicle >> Pinpoint Tests >> Pinpoint Test H: Transaxle Fluid Pressure Switch

Pinpoint Test H: Transaxle Fluid Pressure Switch

WARNING: This page is about a different car, the 2009 Mercury Milan and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 CHECK THE HARNESS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Transmission Control Module (TCM) C2352B
    • Disconnect: Transmission Fluid Pressure Switch C1536
      • Fig 1: Checking Harness For Short To Ground
      GF0029743Courtesy of FORD MOTOR CO.
    • Measure the resistance between transmission fluid pressure switch connector C1536, circuit CET46 (YE/GN) and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  H2.
    2. NO  : REPAIR circuit CET46 (YE/GN) for a short to ground. TEST the system for normal operation.
  2. H2 CHECK THE HARNESS FOR AN OPEN 
      Fig 2: Checking Harness For Open
      GF0029744Courtesy of FORD MOTOR CO.
    • Measure the resistance between transmission fluid pressure switch C1536, circuit CET46 (YE/GN) and TCM C2352B-20, circuit CET46 (YE/GN).
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H3.
    2. NO  : REPAIR circuit CET46 (YE/GN) for an open. TEST the system for normal operation.
  3. H3 CHECK THE INTERNAL HARNESS FOR A SHORT TO GROUND 
    • Connect: TCM C2352B
    • Key in START position.
      • Fig 3: Checking Internal Harness For A Short To Ground
      GF0029745Courtesy of FORD MOTOR CO.
    • Measure the resistance between transmission fluid pressure switch and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new TCM. TEST the system for normal operation.
    2. NO  : INSTALL a new transmission fluid pressure switch. TEST the system for normal operation.
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