LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1155 (Climate Control System - General Information And Diagnostics - (Hybrid)) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test G: The Air Conditioning (A/C) is Always On >> Pinpoint Test G: The Air Conditioning (A/C) Is Always On

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

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before carrying out the following test, diagnose any PCM or instrument cluster DTCs.
NOTE: When disconnecting and reconnecting the pressure transducer electrical connector, make sure that the connector-locking device is in place and that the locking device and connector are correctly and fully seated.
  1. G1 CHECK THE AIR CONDITIONING SWITCH STATUS (CC_AC) HVAC (EATC) PID WITH THE A/C OFF 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: CC_AC HVAC PID
    • Select PANEL mode on the EATC module and make sure the A/C button and indicator are OFF.
    • Does the CC_AC HVAC PID read OFF? 
    1. YES  : Go to  G2.
    2. NO  : Go to  G7.
  2. G2 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the diagnostic tool: AC_REQ PCM PID
    • Select PANEL mode on the EATC module and make sure the A/C button and indicator are OFF.
    • Does the AC_REQ PCM PID read OFF? 
    1. YES  : Go to  G3.
    2. NO  : Go to  G8.
  3. G3 CHECK THE AIR CONDITIONING CLUTCH (WAC/ACCR) PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the diagnostic tool: WAC/ACCR PCM PID
    • Select PANEL mode on the EATC module and make sure the A/C button and indicator are OFF.
    • Does the WAC/ACCR PCM PID read OFF? 
    1. YES  : Go to  G4.
    2. NO  : Go to  G8.
  4. G4 CHECK THE AIR CONDITIONING CLUTCH ALLOWED (ACCLT_ALW) PCM PID 
    • Key in OFF position.
    • Disconnect: Dual-Function Pressure Switch C1062
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: ACCLT_ALW PCM PID
    • Press the PANEL and A/C manual override buttons (A/C indicator ON) on the EATC module.
    • Does the ACCLT_ALW PCM PID read YES? 
    1. YES  : REPAIR circuit CH421 (GY) for a short to voltage. TEST the system for normal operation.
    2. NO  : Go to  G5.
  5. G5 CHECK THE A/C COMPRESSOR OPERATION 
    • With the A/C low charge protection switch still disconnected, press the PANEL and A/C manual override buttons on the EATC module.
    • Does the A/C compressor operate? 
    1. YES  : Go to  G6.
    2. NO  : INSTALL a new A/C low charge protection switch. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
  6. G6 CHECK FOR VOLTAGE TO THE A/C COMPRESSOR CLUTCH FIELD COIL 
    • Key in OFF position.
    • Disconnect: A/C Compressor Clutch Field Coil C100
    • Key in ON position.
    • Select PANEL mode on the EMTC or EATC module and make sure the A/C button is OFF.
    • Measure the voltage between A/C compressor clutch field coil C100-1, circuit CH401 (VT/WH), harness side and ground.
      • Fig 1: Measuring Voltage
      G04002936Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    1. YES  : CARRY OUT the A/C clutch relay component test. Refer to appropriate COMPONENT TESTING article. CHECK the A/C clutch diode. INSTALL a new diode if necessary. If the relay tests OK, REPAIR circuit CH401 (VT/WH) for a short to voltage. TEST the system for normal operation.
    2. NO  : ADJUST the A/C compressor clutch gap. REFER to Air Conditioning (A/C) Clutch Air Gap Adjustment . TEST the system for normal operation.
  7. G7 CHECK THE MODULE CONNECTION 
    • Carry out the Electronic Automatic Temperature Control (EATC) Module Cold Boot Process.
    • Carry out the EATC on-demand self test.
    • Operate the system.
    • Does the concern return? 
    1. YES  : INSTALL a new EATC 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. TEST the system for normal operation.
  8. G8 CHECK THE PCM MODULE CONNECTION 
    • Clear the DTCs.
    • Disconnect all of the PCM connectors.
    • Check for:
      • corrosion.
      • pushed-out connectors/pins.
      • incorrectly seated connector.
    • Connect and correctly seat all of the PCM connectors.
    • Operate the system.
    • Does the concern return? 
    1. YES  : INSTALL a new PCM. 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.
scientia non olet · About LEMON Manuals