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PINPOINT TEST F: DTCs B1B71:11 AND 15

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. F1 CHECK THE SENSOR RESISTANCE 

    Does the evaporator discharge air temperature sensor test OK? 

    1. Yes  : GO to F2  .
    2. No  : INSTALL a new evaporator discharge air temperature sensor. REFER to CLIMATE CONTROL . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. F2 CHECK THE HVAC MODULE OUTPUT VOLTAGE 
    • Ignition ON.
    • Press the POWER button on the HVAC controls.
    • Measure the voltage between evaporator discharge air temperature sensor C296-2  , circuit (LG/BK), harness side and C296-1  , circuit (BK), harness side.
      Fig 1: Checking HVAC Module Output Voltage
      G06505297Courtesy of FORD MOTOR CO.

    Is the voltage between 4.7 and 5.1 volts? 

    1. Yes  : INSTALL a new evaporator discharge air temperature sensor. REFER to CLIMATE CONTROL . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the DTC returns, GO to  F8.
    2. No  : For DTC B1B71:11,  GO to  F6.

      For DTC B1B71:15,  GO to F3  .

  3. F3 CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: HVAC Module - Electronic Manual Temperature Control (EMTC) C2357.
    • Disconnect: HVAC Module - Dual Automatic Temperature Control (DATC) C228A.
    • Ignition ON.
    • Measure the voltage between ground and:
      • For EMTC systems,  HVAC Module - EMTC C2357-19  , circuit VH406 (VT/BN), harness side.
      • For DATC systems,  HVAC module - DATC C228A-19  , circuit VH406 (VT/BN), harness side.
        Fig 2: Checking Circuit EMTC C2357-19 Circuit DATC C228A-19 Circuit For Short To Ground
        G09297343Courtesy of FORD MOTOR CO.

    Is any voltage present? 

    1. Yes  : REPAIR circuit VH406 (VT/BN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    2. No  : GO to F4  .
  4. F4 CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between:
      • For EMTC systems,  HVAC module - EMTC C2357-19  , circuit VH406 (VT/BN), harness side and evaporator discharge air temperature sensor C296-2  , circuit (LG/BK), harness side.
      • For DATC systems,  HVAC module - DATC C228A-19  , circuit VH406 (VT/BN), harness side and evaporator discharge air temperature sensor C296-2  , circuit (LG/BK), harness side.
        Fig 3: Checking Evaporator Temperature Sensor Feedback Circuit For Open
        G09297344Courtesy of FORD MOTOR CO.

    Is the resistance less than 5 ohms? 

    1. Yes  : GO to F5  .
    2. No  : REPAIR circuit VH406 (VT/BN)/(LG/BK) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. F5 CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN 
    • Measure the resistance between:
      • For EMTC systems,  HVAC module - EMTC C2357-23  , circuit RH111 (GY/BU), harness side and evaporator discharge air temperature sensor C296-1  , circuit (BK), harness side.
      • For DATC systems,  HVAC module - DATC C228A-23  , circuit RH111 (GY/BU), harness side and evaporator discharge air temperature sensor C296-1  , circuit (BK), harness side.
        Fig 4: Checking Signal Return Circuit For Open
        G09297345Courtesy of FORD MOTOR CO.

    Is the resistance less than 5 ohms? 

    1. Yes  : GO to  F8.
    2. No  : REPAIR circuit RH111 (GY/BU)/(BK) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. F6 CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO THE SIGNAL RETURN CIRCUIT 
    • Ignition OFF.
    • Disconnect: HVAC Module - EMTC  C2357.
    • Disconnect: HVAC Module - DATC  C228A.
    • Measure the resistance between evaporator discharge air temperature sensor C296-2  , circuit (LG/BK), harness side and C296-1  , circuit (BK), harness side.
      Fig 5: Measuring Resistance Between Evaporator Discharge Air Temperature Sensor C296-2, Circuit (LG/BK), Harness Side And C296-1, Circuit (BK), Harness Side
      G06505300Courtesy of FORD MOTOR CO.

    Is the resistance greater than 10, 000 ohms? 

    1. Yes  : GO to F7  .
    2. No  : REPAIR circuit VH406 (VT/BN)/(LG/BK) for a short to circuit RH111 (GY/BU)/(BK). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  7. F7 CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between ground and:
      • For EMTC systems,  HVAC Module - EMTC C2357-19  , circuit VH406 (VT/BN), harness side.
      • For DATC systems,  HVAC module - DATC C228A-19  , circuit VH406 (VT/BN), harness side.
        Fig 6: Checking Evaporator Temperature Sensor Feedback Circuit For Short To Ground
        G09297347Courtesy of FORD MOTOR CO.

    Is the resistance greater than 10, 000 ohms? 

    1. Yes  : GO to F8  .
    2. No  : REPAIR circuit VH406 (VT/BN)/(LG/BK) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  8. F8 CHECK THE HVAC MODULE CONNECTION 
    • Inspect the HVAC module component and harness side connectors for:
      • corrosion
      • damaged pins
      • pushed-out terminals
    • Connect and correctly seat all the HVAC module connectors.
    • Clear the DTCs.
    • Enter the following diagnostic mode on the scan tool: Self-Test - HVAC Module.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    1. Yes  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . 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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