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Home >> Ford >> 2012 >> Explorer Limited, 3.5 8, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control - EMTC >> Diagnostic Routine(S) >> Diagnostic Routine D >> Pinpoint Test

Pinpoint Test

  1. CHECK THE HVAC MODULE OUTPUT VOLTAGE
    1. Ignition ON.
    2. Press the POWER button on the HVAC controls.
    3. Measure:
      Evaporator Temperature Sensor Evaporator Temperature Sensor
      G08033478
      G08033478
      C296 C296
      Pin Circuit Measurement / Action Pin Circuit
      1 VH406 (VT/BN)
      G08033411
      		 2 RH111 (BY/BU)

      Is the voltage between 4.7 and 5.1 volts? 

      • Yes:  INSTALL a new evaporator temperature sensor (part of 19850). REFER to Heater Core And Evaporator Core Housing . CLEAR the DTCs  and REPEAT the self-test. If the DTC returns, GO to  7.
      • No  : For DTC B1B71:11, GO to  5.

        For DTC B1B71:15, GO to 2  .

  2. CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE
    1. Ignition OFF.
    2. Disconnect: HVAC Module C228A.
    3. Ignition ON.
    4. Measure:
      HVAC Module Ground
      G08033466
      G08031601
      C228A Ground
      Pin Circuit Measurement / Action Pin Circuit
      19 VH406 (VT/BN)
      G08033411
      		 - -

      Is any voltage present? 

      • Yes:  REPAIR the circuit.
      • No  : GO to 3  .
  3. CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR AN OPEN
    1. Ignition OFF.
    2. Measure:
      HVAC Module Evaporator Temperature Sensor
      G08033466
      G08033478
      C228A C296
      Pin Circuit Measurement / Action Pin Circuit
      19 VH406 (VT/BN)
      G08031553
      		 1 VH406 (VT/BN)

      Is the resistance less than 3 ohms? 

      • Yes:  GO to 4  .
      • No  : REPAIR the circuit.
  4. CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN
    1. Measure:
      HVAC Module Evaporator Temperature Sensor
      G08033466
      G08033478
      C228A C296
      Pin Circuit Measurement / Action Pin Circuit
      23 RH111 (GY/BU)
      G08031553
      		 2 RH111 (GY/BU)

      Is the resistance less than 3 ohms? 

      • Yes:  GO to  7.
      • No  : REPAIR the circuit.
  5. CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO THE SIGNAL RETURN CIRCUIT
    1. Ignition OFF.
    2. Disconnect: HVAC Module C228A.
    3. Measure:
      Evaporator Temperature Sensor Evaporator Temperature Sensor
      G08033478
      G08033478
      C296 C296
      Pin Circuit Measurement / Action Pin Circuit
      2 RH111 (GY/BU)
      G08031553
      		 1 VH406 (VT/BN)

      Is the resistance greater than 10, 000 ohms? 

      • Yes:  GO to 6  .
      • No  : REPAIR the circuits.
  6. CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND
    1. Measure:
      HVAC Module Ground
      G08033466
      G08031601
      C228A Ground
      Pin Circuit Measurement / Action Pin Circuit
      19 VH406 (VT/BN)
      G08031553
      		 - -

      Is the resistance greater than 10, 000 ohms? 

      • Yes:  GO to 7  .
      • No  : REPAIR the circuit.
  7. CHECK FOR CORRECT HVAC MODULE OPERATION
    1. Ignition OFF.
    2. Disconnect and inspect all HVAC module connectors.
    3. Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    4. Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
    5. Operate the system and determine if the concern is still present.

      Is the concern still present? 

      • Yes:  CHECK OASIS  for any applicable TSBs  . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs  address this concern, INSTALL a new HVAC module. REFER to Heating Ventilation Air Conditioning (HVAC) Module .
      • No  : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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