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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2081 (Climate Control System - General Information And Diagnostics - (Hybrid)) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test F: The Air Conditioning (A/C) is Always On >> Pinpoint Test F: The Air Conditioning (A/C) Is Always On

Pinpoint Test F: The Air Conditioning (A/C) Is Always On

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. F1 USE THE RECORDED DTCs FROM THE PCM SELF-TEST 
    • Using the recorded results from the PCM self-test:
    • Is DTC P0645, P1459 or P1464 retrieved? 
    1. YES  : REFER to INTRODUCTION -- HYBRID ENGINES article to continue diagnosis.
    2. NO  : Go to  F2.
  2. F2 CHECK THE FUNCTION SELECTOR SWITCH 
    • Key in OFF position.
    • Disconnect: Function Selector Switch C294a
    • Carry out the function selector switch component test. Refer to the Component Tests in this article.
    • Is the function selector OK? 
    1. YES  : Go to  F3.
    2. NO  : INSTALL a new function selector. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
  3. F3 CHECK FOR A FALSE INPUT SIGNAL TO THE PCM 
    • Disconnect: PCM C175b
    • Key in ON position.
    • Measure the voltage between PCM and ground as follows:
      PCM Connector-Pin Circuit
      C175b-2 3053 (YE/LG)
      C175b-3 1398 (PK/WH)
      C175b-15 348 (VT)
    • Is any voltage present? 
    1. YES  : REPAIR the circuit(s) in question. TEST the system for normal operation.
    2. NO  : Go to  F4.
  4. F4 CHECK FOR A SHORTED A/C CLUTCH RELAY 
    • Key in OFF position.
    • Connect: PCM C175b
    • Connect: Function Selector Switch C294a
    • Disconnect: A/C Clutch Relay C1008
    • Start the vehicle and observe the A/C compressor.
    • Is the A/C compressor operating? 
    1. YES  : Go to  F5.
    2. NO  : INSTALL a new A/C clutch relay. TEST the system for normal operation.
  5. F5 CHECK CIRCUIT 321 (GY/WH) FOR A SHORT TO VOLTAGE 
      Fig 1: Checking Circuit For Voltage
      GF0025705Courtesy of FORD MOTOR CO.
    • Measure the voltage between A/C clutch relay C1008-5, circuit 321 (GY/WH), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : CHECK the clutch air gap. REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS article.
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