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Home >> Ford >> 2008 >> Expedition EL RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 81 (Automatic Transaxle/Transmission - 6HP26) >> Diagnostic Tests >> Pinpoint Tests - OSC Equipped Vehicle >> Pinpoint Tests >> Pinpoint Test A: Park Neutral Circuit

Pinpoint Test A: Park Neutral Circuit

WARNING: This page is about a different car, the 2008 Lincoln Navigator L and 2008 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 VERIFY DTC 
    • Select PARK.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Retrieve DTCs
    • Is DTC P1707 current? 
    1. YES  : Go to  A2.
    2. NO  : INSPECT PCM connector C175B, transmission connector C1473 and the inline harness connector C146 are fully connected, pins are fully seated and are in good condition. CLEAR DTCs and TEST the system for normal operation.
  2. A2 CHECK CIRCUIT FOR OPEN 
    • Key in OFF position.
    • Disconnect: PCM C175B
    • Disconnect: Transmission C1473
      • Fig 1: Checking Circuit For Open
      GF0045147Courtesy of FORD MOTOR CO.
    • Measure the resistance between C175B-38 and C1473-10.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A3.
    2. NO  : REPAIR circuit CET40 (GN-OG) for an open. CLEAR DTCs and TEST the system for normal operation.
  3. A3 CHECK CIRCUIT FOR A SHORT TO GROUND 
      Fig 2: Checking Circuit For A Short To Ground
      GF0045148Courtesy of FORD MOTOR CO.
    • Measure the resistance between C175B-38 and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A4.
    2. NO  : REPAIR circuit CET40 (GN-OG) for a short to ground.
  4. A4 CHECK CIRCUIT FOR A SHORT TO VOLTAGE 
      Fig 3: Checking Circuit For A Short To Voltage
      GF0045149Courtesy of FORD MOTOR CO.
    • Measure the voltage between C175B-38 and ground.
    • Is any voltage present? 
    1. YES  : REPAIR circuit CET40 (GN-OG) for a short to voltage.
    2. NO  : REPLACE the mechatronics unit. CLEAR DTC and TEST the system.
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