LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 488 (HVAC System - General Information) >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Pinpoint Test D: The Air Conditioning (A/C) Is Always On

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

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. D1 CHECK THE POWERTRAIN CONTROL MODULE (PCM) PID WACF WITH THE A/C OFF 
    • Key in ON position.
    • With the engine running, place the function selector switch in the OFF position.
    • Enter the following diagnostic mode on the diagnostic tool: PCM PID WACF.
    • Does the PCM PID WACF read YES? 
    1. Yes  : REPAIR circuit 331 (PK/YE). TEST the system for normal operation.
    2. No  : GO to D2.
  2. D2 CHECK THE PCM PID ACCS WITH THE A/C OFF 
    • Enter the following diagnostic mode on the diagnostic tool: PCM PID ACCS.
    • Does the PCM PID ACCS read ON? 
    1. Yes  : GO to D3.
    2. No  : GO to  D5.
  3. D3 CHECK FOR A FALSE ACCS INPUT TO THE PCM 
    • Key in OFF position.
    • Disconnect: PCM C175.
    • Connect the Breakout Box, EEC V Control System to the PCM C175. Do not connect the breakout box to the PCM.
    • Key in ON position.
    • Measure the voltage between the breakout box pin 41 and ground.
      Fig 1: Checking For A False ACCS Input To PCM
      G03276704Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to D4.
    2. No  : INSTALL a new PCM (12A650). REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
  4. D4 CHECK CIRCUIT 348 (VT) 
    • Key in OFF position.
    • Disconnect: Function Selector Switch C294a.
    • Key in ON position.
    • Measure the voltage between the function selector switch C294a pin 2, circuit 348 (VT) and ground.
      Fig 2: Checking Circuit 348 (VT)
      G03276705Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : REPAIR circuit 348 (VT). TEST the system for normal operation.
    2. No  : INSTALL a new function selector switch (19B888). TEST the system for normal operation.
  5. D5 CHECK THE VOLTAGE AT THE A/C COMPRESSOR CLUTCH FIELD COIL 
    • Key in OFF position.
    • Disconnect: A/C Compressor Clutch Field Coil C100.
    • Key in ON position.
    • With the engine running, measure the voltage between the A/C compressor clutch field coil C100, circuit 321 (GY/WH) and ground.
      Fig 3: Checking Voltage At A/C Compressor Clutch Field Coil
      G03276706Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to D6.
    2. No  : CHECK the A/C compressor clutch air gap. REFER to AIR CONDITIONING (A/C) CLUTCH AIR GAP ADJUSTMENT .
  6. D6 CHECK CIRCUIT 321 (GY/WH) 
    • Key in OFF position.
    • Disconnect: A/C Control Relay C1008.
    • Key in ON position.
    • Measure the voltage between the A/C compressor clutch field coil C100, circuit 321 (GY/WH) and ground.
      Fig 4: Checking Circuit 321 (GY/WH)
      G03276707Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : REPAIR circuit 321 (GY/WH). TEST the system for normal operation.
    2. No  : INSTALL a new A/C control relay (14B192). TEST the system for normal operation.
scientia non olet · About LEMON Manuals