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Pinpoint Test A: DTC B2266 - Blend Door Failure Or Short

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 CHECK THE BLEND DOOR ACTUATOR CLOCKWISE OPERATION 
    • Disconnect: EATC Module C228a.
    • Disconnect: EATC Module C228b.
    • Remove the door actuator and disengage the actuator drive shaft from the actuator door. Refer to CONTROL COMPONENTS .
    • Mark the door actuator drive shaft position.
    • Connect a fused jumper wire between EATC module C228b pin 19, circuit 250 (OG) and EATC module C228b pin 11, circuit 22 (LG/BK). Connect a second fused jumper wire between EATC module C228b pin 20, circuit 249 (DB/LG) and EATC module C228a pin 2, circuit 676 (PK/OG).
      Fig 1: Checking Blend Door Actuator Clockwise Operation
      G03910041Courtesy of FORD MOTOR CO.
    • Does the actuator motor move in the clockwise direction? 
    • Yes  : GO to A2.
    • No  : If a fuse in the fused jumper wires opened, REPAIR circuit 250 (OG) for a short to circuit 249 (DB/LG). If the fuses are ok, GO to  A3.
  2. A2 CHECK THE BLEND DOOR ACTUATOR COUNTERCLOCKWISE OPERATION 
    • Connect a fused jumper wire between EATC module C228b pin 20, circuit 249 (DB/LG) and EATC module C228b pin 11, circuit 22 (LG/BK). Connect a second fused jumper wire between EATC module C228b pin 19, circuit 250 (OG) and EATC module C228a pin 2, circuit 676 (PK/OG).
      Fig 2: Checking Blend Door Actuator Counterclockwise Operation
      G03910042Courtesy of FORD MOTOR CO.
    • Does the air bypass door actuator motor move in the closed direction? 
    • Yes  : GO to  A9.
    • No  : GO to A3.
  3. A3 CHECK CIRCUIT 249 (DB/LG) FOR A SHORT TO GROUND 
    • Disconnect: Temperature Blend Door Actuator C289.
    • Measure the resistance between EATC module C228b pin 20, circuit 249 (DB/LG) and ground.
      Fig 3: Checking Circuit 249 (DB/LG) For Short To Ground
      G03910043Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to A4.
    • No  : REPAIR circuit 249 (DB/LG) for a short to ground. TEST the system for normal operation.
  4. A4 CHECK CIRCUIT 250 (OG) FOR A SHORT TO GROUND 
    • Measure the resistance between EATC module C228b pin 19, circuit 250 (OG) and ground.
      Fig 4: Checking Circuit 250 (OG) For Short To Ground
      G03910044Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to A5.
    • No  : REPAIR circuit 250 (OG) for a short to ground. TEST the system for normal operation.
  5. A5 CHECK CIRCUIT 249 (DB/LG) FOR A SHORT TO POWER 
    • Measure the voltage between EATC module C228b pin 20, circuit 249 (DB/LG) and ground.
      Fig 5: Checking Circuit 249 (DB/LG) For Short To Power
      G03910045Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    • Yes  : REPAIR circuit 249 (DB/LG) for a short to power. TEST the system for normal operation.
    • No  : GO to A6.
  6. A6 CHECK CIRCUIT 250 (OG) FOR A SHORT TO POWER 
    • Measure the voltage between EATC module C228b pin 19, circuit 250 (OG) and ground.
      Fig 6: Checking Circuit 250 (OG) For Short To Power
      G03910046Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    • Yes  : REPAIR circuit 250 (OG) for a short to power. TEST the system for normal operation.
    • No  : GO to A7.
  7. A7 CHECK CIRCUIT 249 (DB/LG) FOR AN OPEN 
    • Measure the resistance between EATC module C228b pin 20, circuit 249 (DB/LG) and the temperature blend door actuator C289 pin 7, circuit 249 (DB/LG).
      Fig 7: Checking Circuit 249 (DB/LG) For Open
      G03910047Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to A8.
    • No  : REPAIR circuit 249 (DB/LG) for an open. TEST the system for normal operation.
  8. A8 CHECK CIRCUIT 250 (OG) FOR AN OPEN 
    • Measure the resistance between EATC module C228b pin 19, circuit 250 (OG) and the temperature blend door actuator C289 pin 8, circuit 250 (OG).
      Fig 8: Checking Circuit 250 (OG) For Open
      G03910048Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSPECT for binding or broken linkage. If no condition is found, INSTALL a new door actuator. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : REPAIR circuit 250 (OG) for an open. TEST the system for normal operation.
  9. A9 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE 
    • Connect: Temperature Blend Door Actuator C289.
    • Measure the resistance between EATC module C228a pin 4, circuit 436 (RD/LG) and EATC module C228b pin 6, circuit 438 (RD/WH).
      Fig 9: Checking Feedback Potentiometer Total Resistance
      G03910049Courtesy of FORD MOTOR CO.
    • Is the resistance between 5,000 and 6,000 ohms? 
    • Yes  : GO to A10.
    • No  : If the resistance is greater than 6,000 ohms, GO to  A12.

      If the resistance is less than 5,000 ohms, GO to  A20.

  10. A10 CHECK POTENTIOMETER LOW SIDE RESISTANCE 
    • Measure the resistance between EATC module C228a pin 21, circuit 437 (YE/LG) and EATC module C228b pin 6, circuit 438 (RD/WH).
      Fig 10: Checking Potentiometer Low Side Resistance
      G03910050Courtesy of FORD MOTOR CO.
    • Is the resistance between 250 and 5,500 ohms? 
    • Yes  : GO to A11.
    • No  : If the resistance is greater than 5,500 ohms, GO to  A13.

      If the resistance is less than 250 ohms, GO to  A21.

  11. A11 CHECK POTENTIOMETER HIGH SIDE RESISTANCE 
    • Measure the resistance between EATC module C228a pin 4, circuit 436 (RD/LG) and EATC module C228a pin 21, circuit 437 (YE/LG).
      Fig 11: Checking Potentiometer High Side Resistance
      G03910051Courtesy of FORD MOTOR CO.
    • Is the resistance between 250 and 5,500 ohms? 
    • Yes  : GO to  A15.
    • No  : If the resistance is greater than 5,500 ohms, GO to A12.

      If the resistance is less than 250 ohms, GO to  A22.

  12. A12 CHECK 436 (RD/LG) CIRCUIT FOR AN OPEN 
    • Disconnect: Temperature Blend Door Actuator C289.
    • Measure the resistance between EATC module C228a pin 4, circuit 436 (RD/LG) and the temperature blend door actuator C289 pin 5, circuit 436 (RD/LG).
      Fig 12: Checking Circuit 436 (RD/LG) Circuit For Open
      G03910052Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to A13.
    • No  : REPAIR circuit 436 (RD/LG) for an open. TEST the system for normal operation.
  13. A13 CHECK THE ACTUATOR RETURN CIRCUIT 438 (RD/WH) FOR AN OPEN 
    • Disconnect: Temperature Blend Door Actuator C289.
    • Measure the resistance between EATC module C228b pin 6, circuit 438 (RD/WH) and the temperature blend door actuator C289 pin 6, circuit 438 (RD/WH).
      Fig 13: Checking Actuator Return Circuit 438 (RD/WH) For Open
      G03910053Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to A14.
    • No  : REPAIR circuit 438 (RD/WH) for an open. TEST the system for normal operation.
  14. A14 CHECK CIRCUIT 437 (YE/LG) FOR AN OPEN 
    • Disconnect: Temperature Blend Door Actuator C289.
    • Measure the resistance between EATC module C228a pin 21, circuit 437 (YE/LG) and the temperature blend door actuator C289 pin 1, circuit 437 (YE/LG).
      Fig 14: Checking Circuit 437 (YE/LG) For Open
      G03910054Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new door actuator. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : REPAIR circuit 437 (YE/LG) for an open. TEST the system for normal operation.
  15. A15 CHECK CIRCUIT 436 (RD/LG) FOR A SHORT TO GROUND 
    • Measure the resistance between EATC module C228a pin 4, circuit 436 (RD/LG) and ground.
      Fig 15: Checking Circuit 436 (RD/LG) For Short To Ground
      G03910055Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to A16.
    • No  : REPAIR circuit 436 (RD/LG) for a short to ground. TEST the system for normal operation.
  16. A16 CHECK CIRCUIT 437 (YE/LG) FOR A SHORT TO GROUND 
    • Measure the resistance between EATC module C228a pin 21, circuit 437 (YE/LG) and ground.
      Fig 16: Checking Circuit 437 (YE/LG) For Short To Ground
      G03910056Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to A17.
    • No  : REPAIR circuit 437 (YE/LG) for a short to ground. TEST the system for normal operation.
  17. A17 CHECK CIRCUIT 436 (RD/LG) FOR A SHORT TO POWER 
    • Measure the voltage between EATC module C228a pin 4, circuit 436 (RD/LG) and ground.
      Fig 17: Checking Circuit 436 (RD/LG) For Short To Power
      G03910057Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    • Yes  : REPAIR circuit 436 (RD/LG) for a short to power. TEST the system for normal operation.
    • No  : GO to A18.
  18. A18 CHECK CIRCUIT 437 (YE/LG) FOR A SHORT TO POWER 
    • Measure the voltage between EATC module C228a pin 21, circuit 437 (YE/LG) and ground.
      Fig 18: Checking Circuit 437 (YE/LG) For Short To Power
      G03910058Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    • Yes  : REPAIR circuit 437 (YE/LG) for a short to power. TEST the system for normal operation.
    • No  : GO to A19.
  19. A19 CHECK CIRCUIT 438 (RD/WH) FOR A SHORT TO POWER 
    • Measure the voltage between EATC module C228b pin 6, circuit 438 (RD/WH) and ground.
      Fig 19: Checking Circuit 438 (RD/WH) For Short To Power
      G03910059Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    • Yes  : REPAIR circuit 438 (RD/WH) for a short to power. TEST the system for normal operation.
    • No  : INSTALL a new door actuator. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
  20. A20 CHECK CIRCUIT 438 (RD/WH) AND CIRCUIT 436 (RD/LG) FOR A SHORT TOGETHER 
    • Disconnect: Temperature Blend Door Actuator C289.
    • Measure the resistance between EATC module C228b pin 6, circuit 438 (RD/WH) and EATC module C228a pin 4, circuit 436 (RD/LG).
      Fig 20: Checking Circuit 438 (RD/WH) And Circuit 436 (RD/LG) For Short Together
      G03910060Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR circuits 438 (RD/WH) and circuit 436 (RD/LG) for a short together. TEST the system for normal operation.
    • No  : INSTALL a new door actuator. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
  21. A21 CHECK CIRCUIT 438 (RD/WH) AND CIRCUIT 437 (YE/LG) FOR A SHORT TOGETHER 
    • Measure the resistance between EATC module C228b pin 6, circuit 438 (RD/WH) and EATC module C228a pin 21, circuit 437 (YE/LG).
      Fig 21: Checking Circuit 438 (RD/WH) And Circuit 437 (YE/LG) For Short Together
      G03910061Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR circuits 438 (RD/WH) and circuit 437 (YE/LG) for a short together. TEST the system for normal operation.
    • No  : INSTALL a new door actuator. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
  22. A22 CHECK CIRCUIT 436 (RD/LG) AND CIRCUIT 437 (YE/LG) FOR A SHORT TOGETHER 
    • Measure the resistance between EATC module C228a pin 4, circuit 436 (RD/LG) and EATC module C228a pin 21, circuit 437 (YE/LG).
      Fig 22: Checking Circuit 436 (RD/LG) And Circuit 437 (YE/LG) For A Short Together
      G03910062Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR circuits 436 (RD/LG) and circuit 437 (YE/LG) for a short together. TEST the system for normal operation.
    • No  : INSTALL a new door actuator. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
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