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Pinpoint Test F: Flash Code 4 - Vehicle Speed Signal Circuit Failure

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connectors.
  1. F1 CHECK THE SPEEDOMETER OPERATION 
    • Check the speedometer for correct operation by driving the vehicle.
    • Does the speedometer operate correctly? 
    1. YES  : Go to  F2.
    2. NO  : REFER to INSTRUMENT CLUSTER to continue diagnosis of the speedometer.
  2. F2 CHECK CIRCUIT VMCO5 (VT/OG) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Speed Control Actuator C122
    • Disconnect: PCM C175b
      • Fig 1: Measuring Resistance Between PCM C175B-1, Circuit VMCO5 (VT/OG)
      GF0010778Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175b-1, circuit VMCO5 (VT/OG), harness side and the speed control actuator C122-3, circuit VMCO5 (VT/OG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new speed control actuator. REFER to Speed Control Actuator . REPEAT the self-test.
    2. NO  : REPAIR the circuit. REPEAT the self-test.
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