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Pinpoint Test E: No Operation In All The Temperature Settings

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. E1 CHECK THE VOLTAGE TO THE TEMPERATURE BLEND DOOR ACTUATOR MOTOR 
    • Key in OFF position.
    • Disconnect: Temperature Blend Door Actuator Motor C289.
    • Key in ON position.
    • Measure the voltage between the temperature blend door actuator C289-7, circuit 1003 (GY/YE) and ground.
      Fig 1: Checking Voltage To Temperature Blend Door Actuator Motor
      G03276708Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to E2.
    2. No  : REPAIR circuit 1003 (GY/YE). TEST the system for normal operation.
  2. E2 CHECK THE GROUND TO THE BLEND DOOR ACTUATOR 
    • Key in OFF position.
    • Measure the resistance between the blend door actuator C289-8, circuit 57 (BK) and ground.
      Fig 2: Checking Ground To Blend Door Actuator
      G03276709Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to E3.
    2. No  : REPAIR circuit 57 (BK). TEST the system for normal operation.
  3. E3 CHECK THE TEMPERATURE CONTROL POTENTIOMETER TOTAL RESISTANCE 
    • Measure the resistance between temperature blend door actuator C289-4, circuit 438 (RD/WH) and C289-6, circuit 436 (RD/LG).
      Fig 3: Checking Temperature Control Potentiometer Total Resistance
      G03276710Courtesy of FORD MOTOR CO.
    • Is the resistance between 5,000 and 6,000 ohms? 
    1. Yes  : GO to  E6.
    2. No  : If the resistance is less than 5,000 ohms, GO to E4. If the resistance is greater than 6,000 ohms, GO to E5.
  4. E4 CHECK CIRCUITS 438 (RD/WH) AND 436 (RD/LG) FOR A SHORT TOGETHER 
    • Disconnect: Temperature Control Potentiometer C294d.
    • Measure the resistance between temperature blend door actuator C289-4, circuit 438 (RD/WH) and C289-6, circuit 436 (RD/LG).
      Fig 4: Checking Circuits 438 (RD/WH) And 436 (RD/LG) For A Short Together
      G03276711Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : REPAIR circuits 438 (RD/WH) and 436 (RD/LG) for a short together. TEST the system for normal operation.
    2. No  : INSTALL a new temperature control potentiometer. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
  5. E5 CHECK CIRCUITS 438 (RD/WH) AND 436 (RD/LG) FOR AN OPEN 
    • Disconnect: Temperature Control Potentiometer C294d.
    • Measure the resistance between temperature blend door actuator C289-4, circuit 438 (RD/WH) and temperature control potentiometer C294d-3, circuit 438 (RD/WH), and between temperature blend door actuator C289-6, circuit 436 (RD/LG) and temperature control potentiometer C294d-1, circuit 436 (RD/LG).
      Fig 5: Checking Circuits 438 (RD/WH) And 436 (RD/LG) For An Open
      G03276712Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes  : INSTALL a new temperature control potentiometer. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    2. No  : REPAIR the affected circuit. TEST the system for normal operation.
  6. E6 CHECK THE TEMPERATURE CONTROL POTENTIOMETER OPERATION 
    • Measure the resistance between temperature blend door actuator C289-3, circuit 437 (YE/LG) and C289-6, circuit 436 (RD/LG) while rotating the temperature control potentiometer from full WARM to full COOL.
      Fig 6: Checking Temperature Control Potentiometer Operation
      G03276713Courtesy of FORD MOTOR CO.
    • Does the resistance vary between 250 and 5,500 ohms? 
    1. Yes  : GO to  E9.
    2. No  : GO to E7.
  7. E7 CHECK CIRCUIT 437 (YE/LG) FOR AN OPEN 
    • Disconnect: Temperature Control Potentiometer C294d.
    • Measure the resistances between actuator C289-3, circuit 437 (YE/LG) and temperature control potentiometer C294d-2, circuit 437 (YE/LG).
      Fig 7: Checking Circuit 437 (YE/LG) For An Open
      G03276714Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to E8.
    2. No  : REPAIR circuit 437 (YE/LG) for an open. TEST the system for normal operation.
  8. E8 CHECK CIRCUITS 437 (YE/LG) AND 436 (RD/LG) FOR A SHORT TOGETHER 
    • Measure the resistance between temperature blend door actuator C289-3, circuit 437 (YE/LG) and C289-6, circuit 436 (RD/LG).
      Fig 8: Checking Circuits 437 (YE/LG) And 436 (RD/LG) For A Short Together
      G03276715Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : REPAIR circuits 437 (YE/LG) and 436 (RD/LG) for a short together. TEST the system for normal operation.
    2. No  : INSTALL a new temperature control potentiometer. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
  9. E9 CHECK CIRCUITS 437 (YE/LG) AND 436 (RD/LG) FOR A SHORT TO GROUND 
    • Disconnect: Temperature Control Potentiometer C294d.
    • Measure the resistances between temperature blend door actuator C289-3, circuit 437 (YE/LG) and ground, and between temperature blend door actuator C289-6, circuit 436 (RD/LG) and ground.
      Fig 9: Checking Circuits 437 (YE/LG) And 436 (RD/LG) For A Short To Ground
      G03276716Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes  : REPAIR the affected circuit for a short to ground. TEST the system for normal operation.
    2. No  : GO to E10.
  10. E10 CHECK CIRCUITS 437 (YE/LG) AND 436 (RD/LG) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltages between temperature blend door actuator C289-6, circuit 436 (RD/LG) and ground, and between temperature blend door actuator C289-3, circuit 437 (YE/LG) and ground.
      Fig 10: Checking Circuits 437 (YE/LG) And 436 (RD/LG) For A Short To Voltage
      G03276717Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    1. Yes  : REPAIR the affected circuit for a short to power. TEST the system for normal operation.
    2. No  : GO to E11.
  11. E11 CHECK FOR A BINDING, STUCK OR BROKEN BLEND DOOR 
    • Key in OFF position.
    • Remove the actuator. Refer to CONTROL COMPONENTS .
    • Inspect for a binding, stuck or broken blend door or linkage. 
    • Is there a binding, stuck or broken blend door or linkage condition? 
    1. Yes  : REPAIR the blend door/linkage. TEST the system for normal operation.
    2. No  : INSTALL a new temperature blend door actuator. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
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