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Pinpoint Test C: DTC B2266 Or B2267

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE 
    • Disconnect: HVAC Module C228a
    • Disconnect: HVAC Module C228b
      • Fig 1: Measuring Resistance
      GF0047609Courtesy of FORD MOTOR CO.
    • Measure the resistance between HVAC module C228b-8, circuit 436 (RD/LG), harness side and HVAC module C228a-20, circuit 438 (RD/WH), harness side.
    • Is the resistance greater than 500 ohms? 
    1. YES  : If diagnosing DTC B2266  , Go to  C2.

      If diagnosing DTC B2267  , Go to  C3.

    2. NO  : CARRY OUT the Blend Door Actuator component test under Component Tests . If the actuator tests OK, REPAIR circuits 436 (RD/LG) and 438 (RD/WH) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. C2 CHECK POTENTIOMETER LOW- AND HIGH-SIDE RESISTANCE 
      Fig 2: Measuring Resistance
      GF0047610Courtesy of FORD MOTOR CO.
    • Measure the low-side  resistance between HVAC module C228b-4, circuit 437 (YE/LG), harness side and HVAC module C228a-20, circuit 438 (RD/WH), harness side.
      • Fig 3: Measuring Resistance
      GF0047611Courtesy of FORD MOTOR CO.
    • Measure the high-side  resistance between HVAC module C228b-4, circuit 437 (YE/LG), harness side and HVAC module C228b-8, circuit 436 (RD/LG), harness side.
    • Is the resistance between 250 and 5,500 ohms? 
    1. YES  : Go to  C4.
    2. NO  : If the low-side  resistance only is greater than 5,500 ohms, CARRY OUT the Blend Door Actuator component test under Component Tests . If the actuator tests OK, REPAIR circuit 438 (RD/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      If the low-side  resistance only is less than 250 ohms, CARRY OUT the Blend Door Actuator component test under Component Tests . If the actuator tests OK, REPAIR circuits 437 (YE/LG) and 438 (RD/WH) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      If the high-side  resistance only is greater than 5,500 ohms, CARRY OUT the Blend Door Actuator component test under Component Tests . If the actuator tests OK, REPAIR circuit 436 (RD/LG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      If the high-side  resistance only is less than 250 ohms, CARRY OUT the Blend Door Actuator component test under Component Tests . If the actuator tests OK, REPAIR circuits 437 (YE/LG) and 436 (RD/LG) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      If the high-side and low-side  resistance is greater than 5,500 ohms, CARRY OUT the Blend Door Actuator component test under Component Tests  If the actuator tests OK, REPAIR circuit 437 (YE/LG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

  3. C3 CHECK POTENTIOMETER LOW- AND HIGH-SIDE RESISTANCE 
      Fig 4: Measuring Resistance
      GF0047612Courtesy of FORD MOTOR CO.
    • Measure the low-side  resistance between HVAC module C228b-5, circuit 1122 (RD), harness side and HVAC module C228a-20, circuit 438 (RD/WH), harness side.
      • Fig 5: Measuring Resistance
      GF0047613Courtesy of FORD MOTOR CO.
    • Measure the high-side  resistance between HVAC module C228b-5, circuit 1122 (RD), harness side and HVAC module C228b-8, circuit 436 (RD/LG), harness side.
    • Is the resistance between 250 and 5,500 ohms? 
    1. YES  : Go to  C4.
    2. NO  : If the low-side  resistance only is greater than 5,500 ohms, CARRY OUT the Blend Door Actuator component test under Component Tests . If the actuator tests OK, REPAIR circuit 438 (RD/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      If the low-side  resistance only is less than 250 ohms, CARRY OUT the Blend Door Actuator component test under Component Tests . If the actuator tests OK, REPAIR circuits 1122 (RD) and 438 (RD/WH) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      If the high-side  resistance only is greater than 5,500 ohms, CARRY OUT the Blend Door Actuator component test under Component Tests . If the actuator tests OK, REPAIR circuit 436 (RD/LG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      If the high-side  resistance only is less than 250 ohms, CARRY OUT the Blend Door Actuator component test under Component Tests . If the actuator tests OK, REPAIR circuits 1122 (RD) and 436 (RD/LG) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      If the high-side and low-side  resistance is greater than 5,500 ohms, CARRY OUT the Blend Door Actuator component test under Component Tests  If the actuator tests OK, REPAIR circuit 1122 (RD) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

  4. C4 CHECK CIRCUITS 436 (RD/LG), 437 (YE/LG) AND 1122 (RD) FOR A SHORT TO GROUND 
      Fig 6: Measuring Resistance
      GF0047614Courtesy of FORD MOTOR CO.
    • Measure the resistance between ground and the following:
      • HVAC module C228b-8, circuit 436 (RD/LG), harness side.
      • For DTC B2266  , HVAC module C228b-4, circuit 437 (YE/LG), harness side.
      • For DTC B2267  , HVAC module C228b-5, circuit 1122 (RD), harness side.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  C5.
    2. NO  : REPAIR circuit(s) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. C5 CHECK CIRCUITS 438 (RD/WH), 437 (YE/LG) AND 1122 (RD) FOR A SHORT TO VOLTAGE 
      Fig 7: Measuring Voltage
      GF0047615Courtesy of FORD MOTOR CO.
    • Measure the voltage between ground and the following:
      • HVAC module C228a-20, circuit 438 (RD/WH), harness side.
      • For DTC B2266  , HVAC module C228b-4, circuit 437 (YE/LG), harness side.
      • For DTC B2267  , HVAC module C228b-5, circuit 1122 (RD), harness side.
    • Is any voltage present? 
    1. YES  : If diagnosing DTC B1263  , Go to  C6.

      If diagnosing DTC B1264  , Go to  C7.

    2. NO  : REPAIR circuit(s) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. C6 CHECK THE BLEND DOOR ACTUATOR OPERATION 
    NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short.
    • Key in ON position.
      • Fig 8: Connecting Fused Jumper Wire
      GF0047616Courtesy of FORD MOTOR CO.
    • Connect a fused jumper wire between:
      • HVAC module C228a-13, circuit 246 (VT), harness side and HVAC module C228b-11, circuit 1566 (RD/YE), harness side.
      • HVAC module C228a-26, circuit 245 (BN/LG), harness side and HVAC module C228a-2, circuit 57 (BK), harness side.
    • Remove the fused jumpers.
      • Fig 9: Measuring Resistance
      GF0047610Courtesy of FORD MOTOR CO.
    • Measure the resistance between HVAC module C228b-4, circuit 437 (YE/LG), harness side and HVAC module C228a-20, circuit 438 (RD/WH), harness side.
      • Fig 10: Connecting Fused Jumper Wire
      GF0047617Courtesy of FORD MOTOR CO.
    • Connect a fused jumper wire between:
      • HVAC module C228a-11, circuit 1124 (WH), harness side and HVAC module C228b-11, circuit 1566 (RD/YE), harness side.
      • HVAC module C228a-12, circuit 1125 (BN), harness side and HVAC module C228a-2, circuit 57 (BK), harness side.
    • Remove the fused jumpers.
      • Fig 11: Connecting Fused Jumper Wire
      GF0047616Courtesy of FORD MOTOR CO.
    • Connect a fused jumper wire between:
      • HVAC module C228a-13, circuit 246 (VT), harness side and HVAC module C228b-11, circuit 1566 (RD/YE), harness side.
      • HVAC module C228a-26, circuit 245 (BN/LG), harness side and HVAC module C228a-2, circuit 57 (BK), harness side.
    • Does the resistance increase and decrease when the jumpers are connected? 
    1. YES  : INSPECT for broken door and linkage. REPAIR as necessary. If no condition is found, go to  C9.
    2. NO  : Go to  C8.
  7. C7 CHECK THE BLEND DOOR ACTUATOR OPERATION 
    NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short.
    • Key in ON position.
      • Fig 12: Connecting Fused Jumper Wire
      GF0047618Courtesy of FORD MOTOR CO.
    • Connect a fused jumper wire between:
      • HVAC module C228a-26, circuit 245 (BN/LG), harness side and HVAC module C228b-11, circuit 1566 (RD/YE), harness side.
      • HVAC module C228a-13, circuit 246 (VT), harness side and HVAC module C228a-2, circuit 57 (BK), harness side.
    • Remove the fused jumpers.
      • Fig 13: Measuring Resistance
      GF0047612Courtesy of FORD MOTOR CO.
    • Measure the resistance between HVAC module C228b-5, circuit 1122 (RD), harness side and HVAC module C228a-20, circuit 438 (RD/WH), harness side.
      • Fig 14: Connecting Fused Jumper Wire
      GF0047619Courtesy of FORD MOTOR CO.
    • Connect a fused jumper wire between:
      • HVAC module C228a-12, circuit 1125 (BN), harness side and HVAC module C228b-11, circuit 1566 (RD/YE), harness side.
      • HVAC module C228a-11, circuit 1124 (WH), harness side and HVAC module C228a-2, circuit 57 (BK), harness side.
    • Remove the fused jumpers.
      • Fig 15: Connecting Fused Jumper Wire
      GF0047618Courtesy of FORD MOTOR CO.
    • Connect a fused jumper wire between:
      • HVAC module C228a-26, circuit 245 (BN/LG), harness side and HVAC module C228b-11, circuit 1566 (RD/YE), harness side.
      • HVAC module C228a-13, circuit 246 (VT), harness side and HVAC module C228a-2, circuit 57 (BK), harness side.
    • Does the resistance increase and decrease when the jumpers are connected? 
    1. YES  : INSPECT for broken door and linkage. REPAIR as necessary. If no condition is found, go to  C9.
    2. NO  : Go to  C8.
  8. C8 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN 
    NOTE: Due to limited connector accessibility, before carrying out this test step, visually inspect the wiring between the HVAC module and actuator for opens or shorts. If no damage is visually evident, proceed with the test.
    • Key in OFF position.
    • Disconnect: For DTC B2266, LH Temperature Blend Door Actuator C2091
    • Disconnect: For DTC B2267, RH Temperature Passenger Blend Door Actuator C2092
      • Fig 16: Measuring Resistance
      GF0047620Courtesy of FORD MOTOR CO.
      NOTE: For DTC B2266  only.
    • Measure the resistance between HVAC module C228a-26, circuit 245 (BN/LG), harness side and the LH temperature blend door actuator C2091-6, circuit 245 (BN/LG), harness side.
      • Fig 17: Measuring Resistance
      GF0047621Courtesy of FORD MOTOR CO.
      NOTE: For DTC B2266  only.
    • Measure the resistance between HVAC module C228a-13, circuit 246 (VT), harness side and the LH temperature blend door actuator C2091-1, circuit 246 (VT), harness side.
      • Fig 18: Measuring Resistance
      GF0047622Courtesy of FORD MOTOR CO.
      NOTE: For DTC B2267  only.
    • Measure the resistance between HVAC module C228a-12, circuit 1125 (BN), harness side and the RH temperature blend door actuator C2092-6, circuit 1125 (BN), harness side.
      • Fig 19: Measuring Resistance
      GF0047623Courtesy of FORD MOTOR CO.
      NOTE: For DTC B2267  only.
    • Measure the resistance between HVAC module C228a-11, circuit 1124 (WH), harness side and the RH temperature blend door actuator C2092-1, circuit 1124 (WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSPECT for binding or broken linkage. REPAIR as necessary. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation.
    2. NO  : REPAIR the circuit(s) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  9. C9 CHECK HVAC MODULE CONNECTION 
    1. YES  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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