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Pinpoint Test A: No Communication With The Front Electronic Module (Fem)

  1. A1 CHECK CIRCUITS 29-DK20 (OG/GN) AND 29S-DK21 (OG/WH) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: FEM C201a.
    • Disconnect: FEM C201c.
    • Key in ON position.
    • Measure the voltage between the FEM C201a-1, circuit 29S-DK21 (OG/WH), harness side and ground; and between the FEM C201c-6, circuit 29-DK20 (OG/GN), harness side and ground.
      Fig 1: Checking Circuits 29-DK20 (OG/GN) And 29S-DK21 (OG/WH) For Voltage
      G03999202Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to A2.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
  2. A2 CHECK THE FEM GROUND CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Use the following table to measure the resistance between the FEM connector, harness side and ground:
      FEM CONNECTOR-PIN & CIRCUIT

      Connector-Pin Circuit
      C201a-11 31-DK20A (BK)
      C201a-13 31-DK20B (BK)
      C201a-14 31-DK20C (BK)
      C201a-15 31-DK20D (BK)
      C201c-12 31-DK20 (BK)
      Fig 2: Checking The FEM Ground Circuits For An Open
      G03999203Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
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