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Home >> Lincoln >> 2012 >> MKZ Hybrid >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (HVAC - Climate Control System - General Information And Diagnostics (Except Hybrid)) >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Pinpoint Test C: DTCs C1B14:11 and 12 >> PINPOINT TEST C: DTCs C1B14:11 AND 12

PINPOINT TEST C: DTCs C1B14:11 AND 12

WARNING: This page is about a different variant/trim than selected.
  1. C1 CHECK THE SENSOR RESISTANCE 
    • Check for HVAC DTCs.
    • Is DTC C1B14:11 present? 
    • Yes:  GO to C2.
    • No:  GO to  C4.
  2. C2 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: HVAC Module - Electronic Manual Temperature Control (EMTC) C2357a.
    • Disconnect: HVAC Module - Dual Automatic Temperature Control (DATC) C2356a.
    • Disconnect: HVAC Module - DATC C2356b.
    • Measure the resistance between ground and HVAC module - EMTC C2357A-11 or HVAC module - DATC C2356A-11, circuit LH111 (BN/WH), harness side.
      Fig 1: Checking Circuit LH111 (BN/WH) For Short To Ground
      G06064523Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes:  GO to C3.
    • No:  REPAIR circuit LH111 (BN/WH) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  3. C3 CHECK CIRCUITS LH111 (BN/WH) AND RH111 (GY/BU) FOR A SHORT TOGETHER 
    • Measure the resistance between HVAC module - EMTC C2357A-11 or HVAC module - DATC C2356A-11, circuit LH111 (BN/WH), harness side and HVAC module - EMTC C2357A-10 or HVAC module C2356A-10, circuit RH111 (GY/BU), harness side.
      Fig 2: Checking Circuit LH111 (BN/WH) And RH111 (GY/BU) For Short Together
      G06064524Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 200 ohms? 
    • Yes:  GO to  C5.
    • No:  REPAIR circuits LH111 (BN/WH) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. C4 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: HVAC Module - EMTC C2357a.
    • Disconnect: HVAC Module - DATC C2356a.
    • Disconnect: HVAC Module - DATC C2356b.
    • Ignition ON.
    • Measure the voltage between ground and HVAC module - EMTC C2357A-11 or HVAC module - DATC C2356A-11, circuit LH111 (BN/WH), harness side.
      Fig 3: Checking Circuit LH111 (BN/WH) For Short To Voltage
      G06064525Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR circuit LH111 (BN/WH) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No:  GO to C5.
  5. C5 CHECK THE MODULE CONNECTION 
    • Inspect the module connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the HVAC module connectors.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
    • 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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