LEMON Manuals: Even more car manuals for everyone
Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (HVAC Climate Control System - General Information And Diagnostics - (Hybrid)) >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Normal Operation >> Pinpoint Test H: The Air Conditioning (A/C) Is Always On - A/C Mode Always Commanded On

Pinpoint Test H: The Air Conditioning (A/C) Is Always On - A/C Mode Always Commanded On

WARNING: This page is about a different variant/trim than selected.
NOTE: Before carrying out the following test, diagnose any PCM or Instrument Cluster (IC) DTCs.
  1. H1 CHECK THE AIR CONDITIONING SWITCH STATUS (CC_AC) HVAC PID WITH THE A/C OFF 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: CC_AC HVAC PID.
    • Select PANEL mode on the HVAC module and make sure the A/C button and indicator are OFF.
    • Does the CC_AC HVAC PID read OFF? 
    • Yes:  GO to H2  .
    • No:  GO to  H5.
  2. H2 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the scan tool: AC_REQ PCM PID.
    • Select PANEL mode on the HVAC module and make sure the A/C button and indicator are OFF.
    • Does the AC_REQ PCM PID read OFF? 
    • Yes:  GO to H3  .
    • No:  GO to  H6.
  3. H3 CHECK THE AIR CONDITIONING CLUTCH ALLOWED (ACCLT_ALW) PCM PID 
    • Ignition OFF.
    • Disconnect: Dual-Function Pressure Switch C1062.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: ACCLT_ALW PCM PID.
    • Press the PANEL and A/C manual override buttons (A/C indicator ON) on the HVAC module.
    • Does the ACCLT_ALW PCM PID read YES? 
    • Yes:  REPAIR circuit CH421 (GY) for a short to voltage. TEST the system for normal operation.
    • No:  GO to H4  .
  4. H4 CHECK THE A/C COMPRESSOR OPERATION 
    • Ignition OFF.
    • Connect: Dual-Function Pressure Switch C1062.
    • Disconnect: Low Charge Protection Switch C130.
    • With the engine running, press the PANEL and A/C manual override buttons on the HVAC module.
    • Does the A/C compressor operate? 
    • Yes:  GO to  H6.
    • No:  INSTALL a new A/C low charge protection switch. REFER to CLIMATE CONTROL . TEST the system for normal operation.
  5. H5 CHECK THE MODULE CONNECTION 
    • Ignition OFF.
    • Disconnect all the HVAC module connectors.
    • Check for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the HVAC module connectors.
    • 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. TEST the system for normal operation.
  6. H6 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? 
    • Yes:  INSTALL a new PCM. 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.
scientia non olet · About LEMON Manuals