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Pinpoint Test G: The Anti-Theft Indicator Is Always/Never On

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK THE ANTI-THEFT INDICATOR FOR CORRECT OPERATION 
    • Key in OFF position.
    • Disconnect: PCM C175.
    • Connect a 5 amp fused jumper wire between the PCM C175 pin 30, circuit 343 (DB/LG), harness side and ground.
      Fig 1: Checking Anti-Theft Indicator For Correct Operation
      G03277314Courtesy of FORD MOTOR CO.
    • Does the theft LED illuminate? 
    1. Yes  : GO to  G4.
    2. No  : GO to G2.
  2. G2 CHECK THE VOLTAGE TO THE ANTI-THEFT LED CIRCUIT 3049 (BK/LG) 
    • Disconnect: Instrument Cluster C220b.
    • Measure the voltage between the instrument cluster C220b pin 10, circuit 3049 (BK/LG), harness side and ground.
      Fig 2: Checking Voltage To The Anti-Theft Led Circuit 3049 (BK/LG)
      G03277315Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to G3.
    2. No  : REPAIR the circuit. CLEAR the DTCs.

      REPEAT the self-test.

  3. G3 CHECK CIRCUIT 343 (DB/LG) FOR AN OPEN BETWEEN THE PCM AND THE INSTRUMENT CLUSTER 
    • Measure resistance between the PCM C175 pin 30, circuit 343 (DB/LG), harness side and the instrument cluster C220a pin 10, circuit 343 (DB/LG), harness side.
      Fig 3: Checking Circuit 343 (DB/LG) For An Open Between PCM And Instrument Cluster
      G03277316Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : INSTALL a new anti-theft LED if necessary.

      REFER to INSTRUMENT CLUSTER .

    2. No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self -test.
  4. G4 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS .

      REPROGRAM the encoded ignition keys.

      REFER to KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT . CLEAR the DTCs. REPEAT the self -test.

    2. No  : The system is operating correctly at this time.

      Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

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