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Pinpoint Test B: The Set Speed Fluctuates

  1. B1 CHECK THAT CONDITION OCCURS ONLY WHILE USING SPEED CONTROL 
    • Check that the condition does not occur when driving without speed control.
    • Does the condition occur without speed control? 
    1. Yes:  REPAIR engine as necessary. TEST the system for normal operation.
    2. No:  GO to B2.
  2. B2 CHECK THE SPEED CONTROL ACTUATOR CABLE 
      NOTE: The speed control actuator cable must be disconnected at both ends while carrying out this test.
    • Check the speed control actuator cable for sticking or binding at the speed control servo and throttle body.
    • Is the speed control actuator cable OK? 
    1. Yes:  GO to B3.
    2. No:  INSTALL a new speed control actuator cable. REFER to ACTUATOR CABLE - SPEED CONTROL  TEST the system for normal operation.
  3. B3 CHECK THE SPEED CONTROL SERVO 
    • INSTALL a known good speed control servo.
    • Test drive the vehicle for correct operation.
    • Does the speed control operate correctly? 
    1. Yes:  INSTALL a new speed control servo. REFER to ACTUATOR - SPEED CONTROL SERVO . TEST the system for normal operation.
    2. No:  INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
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