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

WARNING: This page is about a different car, the 2009 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(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? 
  2. F2 CHECK THE VEHICLE SPEED SIGNAL VOLTAGE 
    NOTE: Make sure the vehicle is secured correctly before attempting to place the transmission range selector lever in DRIVE (D), or in 1st gear, if equipped with a manual transmission.
    • Disconnect: Speed Control Actuator C122.
    • With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to JACKING & LIFTING .
      • NOTE: For vehicles equipped with a manual transmission, place the transmission into 1st gear.
    • Start the vehicle, place the transmission in DRIVE (D), and with the engine at idle, allow the drive wheels to spin.
    • Measure and record the AC voltage between the speed control actuator C122- 3, circuit VMC05 (VT/OG), harness side and ground with the vehicle drive wheels spinning a minimum of 8 km/h (5 mph).
      Fig 1: Measuring AC Voltage Between Speed Control Actuator C122- 3, Circuit VMC05 (VT/OG) And Ground
      G06182284Courtesy of FORD MOTOR CO.
    • Apply the brakes until the drive wheels come to a stop. Place the transmission in PARK (P), fully engage the parking brake and turn the engine OFF.
    • Is the AC voltage greater than 4.5 volts? 
    • Yes  : GO to F3  .
    • No  : GO to  F4.
  3. F3 CHECK THE VEHICLE SPEED SIGNAL FREQUENCY 
    NOTE: Make sure the vehicle is secured correctly before attempting to place the transmission range selector lever in DRIVE (D), or in 1st gear, if equipped with a manual transmission.
      NOTE: For vehicles equipped with a manual transmission, place the transmission into 1st gear.
    • Start the vehicle, place the transmission in DRIVE (D), and with the engine at idle, allow the drive wheels to spin.
      • NOTE: Make sure the automotive meter is set for DC Hz when measuring the frequency.
    • Measure and record the frequency between the speed control actuator C122- 3, circuit VMC05 (VT/OG), harness side and ground with the vehicle drive wheels spinning a minimum of 8 km/h (5 mph). Record the speedometer reading.
      Fig 2: Measuring Frequency Between Speed Control Actuator C122- 3, Circuit VMC05 (VT/OG), Harness Side And Ground
      G06182283Courtesy of FORD MOTOR CO.
    • Apply the brakes until the drive wheels come to a stop. Place the transmission in PARK (P), fully engage the parking brake and turn the engine OFF.
    • Divide the frequency reading by 2.2 to get a mph result and compare this to the reading of the speedometer.
    • Does the frequency reading result match the speedometer reading? 
    • Yes  : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR . TEST the system for normal operation.
    • No  : GO to  F6.
  4. F4 CHECK THE VEHICLE SPEED SIGNAL FOR A SHORT TO GROUND 
    • Measure the resistance between the speed control actuator C122-3, circuit VMC05 (VT/OG), harness side and ground.
      Fig 3: Measuring Resistance Between Speed Control Actuator C122-3, Circuit VMC05 (VT/OG) Harness Side And Ground
      G06182303Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to F5  .
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. F5 CHECK THE VEHICLE SPEED SIGNAL CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: PCM C175b.
    • Measure the resistance between the PCM C175b-1, circuit VMC05 (VT/OG), harness side and the speed control actuator C122-3, circuit VMC05 (VT/OG), harness side.
      Fig 4: Measuring Resistance Between PCM C175B-1 And Speed Control Actuator C122-3
      G06182287Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to F6  .
    • No  : REPAIR the circuit. TEST the system for normal operation.
  6. F6 CHECK FOR CORRECT PCM OPERATION 
    • Connect: All Disconnected Connectors.
    • Disconnect the PCM connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the PCM connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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