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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1409 (Automatic Transmission - AISIN Aw21) >> Diagnostic Tests >> Pinpoint Tests - Non OSC Equipped Vehicle >> Pinpoint Tests >> Pinpoint Test E: Park Neutral Signal

Pinpoint Test E: Park Neutral Signal

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. E1 CHECK FOR VOLTAGE ON CIRCUIT CET40 (GN/OG) 
    • Disconnect: Transmission Control Module (TCM) C1533
    • Key in ON position.
    • Selector lever in PARK or NEUTRAL.
      • Fig 1: Checking For Voltage On Circuit CET40 (GN/OG)
      GF0017768Courtesy of FORD MOTOR CO.
    • Measure the voltage between C1533-5, circuit CET40 (GN/OG) and chassis ground.
    • Is the voltage between 0-0.8 volt? 
    1. YES  : Go to  E2.
    2. NO  : Go to  E3.
  2. E2 CHECK FOR VOLTAGE ON CIRCUIT CET40 (GN/OG) 
    • Selector lever in REVERSE, DRIVE or LOW.
      • Fig 2: Checking Voltage On Circuit CET40 (GN/OG)
      GF0017768Courtesy of FORD MOTOR CO.
    • Measure the voltage between C1533-5, circuit CET40 (GN/OG) and chassis ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new TCM. After installing the new TCM, VERIFY that the starting system is operating correctly. If not, REFER to ENGINE COOLING article to check starting system.
    2. NO  : Go to  E3.
  3. E3 CHECK VEHICLE HARNESS CIRCUIT CET40 (GN/OG) FOR AN OPEN 
    • Disconnect: PCM C175B
      • Fig 3: Measuring Resistance Between C1533-5, Circuit CET40 (GN/OG) & C175B-16
      GF0029619Courtesy of FORD MOTOR CO.
    • Measure the resistance between C1533-5, circuit CET40 (GN/OG) and C175B-16.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  E4.
    2. NO  : REPAIR circuit CET40 (GN/OG) for an open.
  4. E4 CHECK VEHICLE HARNESS CIRCUIT CET40 (GN/OG) FOR A SHORT TO GROUND 
      Fig 4: Checking Vehicle Harness Circuit CET40 (GN/OG) For A Short To Ground
      GF0017770Courtesy of FORD MOTOR CO.
    • Measure the resistance between C1533-5, circuit CET40 (GN/OG) and chassis ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : REPAIR circuit CET40 (GN/OG) for a short to ground.
    2. NO  : INSTALL a new PCM. After installing the new PCM, VERIFY that the starting system is operating correctly. If not, REFER to ENGINE COOLING article to check starting system.
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