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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 E: Park Neutral Signal

Pinpoint Test E: Park Neutral Signal

WARNING: This page is about a different variant/trim than selected.
  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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