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Pinpoint Test B: The Set Speed Fluctuates

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. B1 CHECK SPEED CONTROL CABLE/THROTTLE BODY LINKAGE 

    NOTE: It is normal for the engine RPM to increase slightly and then drop off slowly when the clutch pedal is applied during operation.
    • Key in OFF position.
    • Remove the speed control cable from the speed control actuator. Visually inspect the core wire and check the speed control cable by pulling on the cable and noting the throttle movement.
    • Is the speed control cable OK? 
    1. Yes  : GO to B2.
    2. No  : INSTALL a new speed control cable or REPAIR the throttle body linkage. For speed control cable installation, REFER to SPEED CONTROL CABLE . To repair the throttle linkage, REFER to ACCELERATION CONTROL . TEST the system for normal operation
  2. B2 CHECK THE SPEEDOMETER 
    • Check the speedometer for correct operation by driving the vehicle.
    • Does the speedometer fluctuate? 
    1. Yes  : REPAIR the speedometer. REFER to INSTRUMENT CLUSTER .
    2. No  : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR . TEST the system for normal operation.
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