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Land Rover Range Rover Classic Etm 1995 2nd Edition Exp Rover Manual

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    							ELECTRICAL TROUBLESHOOTING MANUA L
    K1   ETM
    Blower Controls
    8
    1995 RANGE ROVER
    
     
    
    
     
     
     
     	
    
    
    
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    Ignition Load Relay
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    							ELECTRICAL TROUBLESHOOTING MANUAL
    ETM K1
    Blower Controls
    9
    1995 RANGE ROVER
    
     
    
     	
     
    
    	
    
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    							ELECTRICAL TROUBLESHOOTING MANUA L
    K1   ETM
    Blower Controls
    10
    1995 RANGE ROVER
     
      
    
     
     
     
     	
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    							ELECTRICAL TROUBLESHOOTING MANUAL
    ETM K1
    Blower Controls
    11
    1995 RANGE ROVER
     	
    
    
     
    
     
    
    	
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    							ELECTRICAL TROUBLESHOOTING MANUA L
    K1   ETM
    Blower Controls
    12
    1995 RANGE ROVER
    
     
     
     
     	
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    							ELECTRICAL TROUBLESHOOTING MANUAL
    ETM K1
    Blower Controls
    13
    1995 RANGE ROVER
    
     	  
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    							ELECTRICAL TROUBLESHOOTING MANUA L
    K1   ETM
    Blower Controls
    14
    1995 RANGE ROVER
    	 	 	 	 
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    							ELECTRICAL TROUBLESHOOTING MANUAL
    ETM K1
    Blower Controls
    15
    1995 RANGE ROVER
     
      
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    							ELECTRICAL TROUBLESHOOTING MANUA L
    K1   ETM
    Blower Controls
    16
    1995 RANGE ROVER
    
    	 	 
    	 	 
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    							COMPRESSOR CONTROLS
    1
    ETM K2
    1995 RANGE ROVER
    ELECTRICAL TROUBLESHOOTING MANUAL
    CIRCUIT OPERATION
    Compressor Control (Petrol)
    With the Ignition Switch (X134) in position II,
    battery voltage is applied to the Ignition Load Relay
    (K127). The relay is energized, applying battery
    voltage to the Compressor Clutch Relay (K108)
    and the A/C Logic Relay (K170). When the Fan
    Speed Switch (X179) is turned to positions I, II, III,
    or IV and the Front A/C Switch (X225) is turned
    On, ground is provided to terminal 86 of the A/C
    Logic Relay (K170) through the closed contacts of
    the A/C Dual Pressure Switch (X102) and the Front
    A/C Evaporator Temperature Switch (X101).
    The relay is energized, applying battery voltage to
    terminal 21 of the Engine Control Module (ECM)
    (Z132), signalling the ECM that compressor
    operation has been requested. The ECM then
    provides ground to the coil of the Compressor
    Clutch Relay (K108). The relay is energized,
    applying battery voltage to the Compressor Clutch
    (K107). Compressor Clutch operation is now
    controlled by the status of the A/C Dual Pressure
    Switch (X102) and the Front A/C Evaporator
    Temperature Switch (X101).
    The Front A/C Evaporator Temperature Switch
    (X101) is fitted in the airflow out of the front
    evaporator to sense the temperaure of the exterior
    fins. Should ice begin to form, due to low
    temperature, the switch will open. The A/C Dual
    Pressure Switch (X102) monitors refrigerant
    pressure in the high pressure line, should pressure
    become too high or too low the switch will open.
    When one or both of these switches open the
    ground supply to terminal 86 of the A/C Logic
    Relay (K170) will be interrupted. The relay
    de±energizes, removing battery voltage from the
    Engine Control Module (ECM) (Z132), signalling
    the ECM that compressor operation should be
    turned off. The ECM removes the ground supply to
    the coil of the Compressor Clutch Relay (K108).
    The relay then de±energizes, removing battery
    voltage from the Compressor Clutch (K107),
    disengaging the Compressor. 
    						
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