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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1354 (HVAC Climate Control System - General Information And Diagnostics) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test G: DTC B2826 or B2827 >> Pinpoint Test G: DTC B2826 Or DTC B2827

Pinpoint Test G: DTC B2826 Or DTC B2827

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK THE SENSOR RESISTANCE 
    • Key in OFF position.
    • Disconnect: Evaporator Discharge Temperature Sensor C2295
    • Carry out the Temperature Sensor - Evaporator Discharge .
    • Is the resistance within the specified values for the temperatures? 
    1. YES  : Go to  G2.
    2. NO  : INSTALL a new in-vehicle temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. G2 CHECK THE HVAC MODULE OUTPUT VOLTAGE 
    • Key in ON position.
    • Press the AUTO button.
      • Fig 1: Checking EATC Sensor Output Voltage
      GF0030250Courtesy of FORD MOTOR CO.
    • Measure the voltage between evaporator discharge temperature sensor C2295-2, circuit VH406 (VT/BN), harness side and C2295-1, circuit RH104 (BU/BN), harness side.
    • Is the voltage between 4.7 and 5.1 volts? 
    1. YES  : INSTALL a new evaporator discharge sensor. If code returns, go to  G7.
    2. NO  : If diagnosing DTC B2826, go to  G3.

      If diagnosing DTC B2827, go to  G5.

  3. G3 CHECK CIRCUIT VH406 (VT/BN) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: HVAC Module - DATC 2356b
      • Fig 2: Checking Circuit VH406 (VT/BN) For An Open
      GF0041568Courtesy of FORD MOTOR CO.
    • Measure the resistance between HVAC module - DATC C2356b-10, circuit VH406 (VT/BN), harness side and evaporator discharge temperature sensor C2295-2, circuit VH406 (VT/BN), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G4.
    2. NO  : REPAIR circuit VH406 (VT/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. G4 CHECK CIRCUIT RH104 (BU/BN) FOR AN OPEN 
      Fig 3: Checking Circuit RH104 (BU/BN) For An Open
      GF0041569Courtesy of FORD MOTOR CO.
    • Measure the resistance between HVAC module - DATC C2356b-3, circuit RH104 (BU/BN), harness side and evaporator discharge temperature sensor C2295-1, circuit RH104 (BU/BN), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G7.
    2. NO  : REPAIR circuit RH104 (BU/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. G5 CHECK CIRCUITS VH406 (VT/BN) AND RH104 (BU/BN) FOR A SHORT TOGETHER 
    • Key in OFF position.
    • Disconnect: HVAC Module - DATC 2356b
      • Fig 4: Checking Circuit VH406 (VT/BN) For A Short To Circuit RH104 (BU/BN)
      GF0030253Courtesy of FORD MOTOR CO.
    • Measure the resistance between evaporator discharge temperature sensor C2295-2, circuit VH406 (VT/BN), harness side and C2295-1, circuit RH104 (BU/BN), harness side.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G6.
    2. NO  : REPAIR circuits VH406 (VT/BN) and RH104 (BU/BN) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. G6 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO GROUND 
      Fig 5: Checking Circuit VH406 (VT/BN) For A Short To Ground
      GF0041570Courtesy of FORD MOTOR CO.
    • Measure the resistance between HVAC module - DATC C2356b-10, circuit VH406 (VT/BN), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G7.
    2. NO  : REPAIR circuit VH406 (VT/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  7. G7 CHECK THE MODULE CONNECTION 
    • Carry out the HVAC Module Cold Boot Process.
    • Carry out the HVAC Module - Electronic Automatic Temperature Control (EATC) and HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test.
    • Operate the system.
    • Does the concern return? 
    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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