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Land Rover Discovery Lhd Models Etm 1995 4th Edition Exp Rover Manual

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Page 326 ELECTRICAL TROUBLESHOOTING MANUA L
K2 ETM
Compressor Controls
26
DISCOVERY

K170
A/C Logic Relay

K170
A/C Logic Relay

%! %

%! %

Engine Control
Module (ECM) ( !#$$!# &%
# (

(
A/C Logic Relay

!#$$!# &%

Page 327 ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
27
DISCOVERY

()

+
A/C Dual Pres-
sure Switch # +
# +

Front A/C Evap-
orator Tempera-
ture Switch +
# +
# +
!$#)#%$ *#)

$!#$

%$) $ & *#)

%$) *#)

1
X101
Front A/C Evap-
orator Tempera-
ture Switch

!$#)#%$ *#)

...

Page 328 ELECTRICAL TROUBLESHOOTING MANUA L
K2 ETM
Compressor Controls
28
DISCOVERY

# $#

%

Condenser Fan
Control Diode 2 %

#
! $#

# $#

X225
Front A/C Switch

%
% %

Front A/C Switch %

12345

Page 329 ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
29
DISCOVERY

!!# (!

!!# (!

!% )
&
%# $ (!

)
Engine Control
Module (ECM)Compressor
Clutch Relay )

K108
Compressor
Clutch Relay

%# $ (!

1234
40 39 38 37 36 35 34 33 32 31 30 29 285678910111213
14 15 16 17 18 19 20 21 22 23...

Page 330 ELECTRICAL TROUBLESHOOTING MANUA L
K2 ETM
Compressor Controls
30
DISCOVERY

#$# (!

A/C Logic Relay ) &$# # % (!

1
K170
A/C Logic Relay

#$# (!

X101
Front A/C Evap-
orator Tempera-
ture Switch

&$# # % (!

& )

& )

Front A/C Evap-
orator...

Page 331 ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
31
DISCOVERY

!$#)#%$ *#)

!$#)#%$ *#)

# +
()
%$) $ & *#)

+
Engine Control
Module (ECM)Compressor
Clutch Relay +
Z132
Engine Control
Module (ECM)

K108
Compressor
Clutch Relay

%$) $ & *#)

...

Page 332 ELECTRICAL TROUBLESHOOTING MANUA L
K2 ETM
Compressor Controls
32
DISCOVERY

#$# (!

A/C Logic Relay ) &$# # % (!

1
K170
A/C Logic Relay

#$# (!

X101
Front A/C Evap-
orator Tempera-
ture Switch

&$# # % (!

& )

& )
Front A/C Evap-
orator Tempera-
ture...

Page 333 ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
33
DISCOVERY

$)&.&*) 0&.!%

#-.
Compressor
Clutch Relay 1

K108
Compressor
Clutch Relay

,*). ) +## 0&.!%

& 0&.%*/.

&,# 1
1
*(+,#--*, /.!% /.
*/. 0&.!%
1
X101
Front A/C Evap-
orator Tempera-
ture Switch

1
Front A/C Evap-
orator Tempera-
ture Switch

...

Page 334 ELECTRICAL TROUBLESHOOTING MANUA L
K2 ETM
Compressor Controls
34
DISCOVERY

&
! (!

!% )
)
Engine Control
Module (ECM)Compressor
Clutch Relay )
Z132
Engine Control
Module (ECM)

K108
Compressor
Clutch Relay

!!# (!

!!# (!

%# $ (!

%# $ (!

R550001
19
37
551
20
38

Page 335 ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
35
DISCOVERY

A/C Logic Relay )

1
K170
A/C Logic Relay

X101
Front A/C Evap-
orator Tempera-
ture Switch

& )

& )

#$# (!

&$# # % (!

#$# (!

&$# # % (!

)Front A/C Evap-
orator...

Page 336 ELECTRICAL TROUBLESHOOTING MANUA L
K2 ETM
Compressor Controls
36
DISCOVERY

$ %$

&

A/C Dual Pres-
sure Switch & $ ! %$

X225
Front A/C Switch

&

Front Fan Speed
Switch &

#$
&
Condenser Fan
Control Diode 2 &
Front A/C Switch &

12345

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							ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
31
DISCOVERY
 
  

 	
 
!$#)#%$ *#)


 


	







!$#)#%$ *#)


 




 	
 

#  +
 () 
%$) $ &   *#)


 
+
Engine Control
Module (ECM)Compressor
Clutch Relay +
Z132
Engine Control
Module (ECM)




K108
Compressor
Clutch Relay

	
		
	


%$) $ &   *#)

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							ELECTRICAL TROUBLESHOOTING MANUA L
K2   ETM
Compressor Controls
32
DISCOVERY


	

 #$# (!

 

 	
A/C Logic Relay ) &$# # % (!

  

	 

  



1
K170
A/C Logic Relay
	 

  


   


	

 #$# (!

 

X101
Front A/C Evap-
orator Tempera-
ture Switch






&$# # % (!

  
	
 	
 & )

 & )
Front A/C Evap-
orator Tempera-
ture Switch )

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image text

							ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
33
DISCOVERY


 	
 
$)&.&*) 0&.!%


 


	



#-. 
Compressor
Clutch Relay 1

K108
Compressor
Clutch Relay






,*).  ) +## 0&.!%


  
& 0&.%*/. 
	
 



 	
&,# 1
1
*(+,#--*, /.!% /.
*/. 0&.!%
1
X101
Front A/C Evap-
orator Tempera-
ture Switch


1
Front A/C Evap-
orator Tempera-
ture Switch
	
 
  


$)&.&*) 0&.!%


 

 
,*).  ) +## 0&.!%

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							ELECTRICAL TROUBLESHOOTING MANUA L
K2   ETM
Compressor Controls
34
DISCOVERY

& 
! (! 
	

 



 

!% )
)
Engine Control
Module (ECM)Compressor
Clutch Relay )
Z132
Engine Control
Module (ECM)


K108
Compressor
Clutch Relay



	



 	



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!!# (! 
	
	 

 

%#  $ (! 
	
	 


%#  $ (! 
	
	  
R550001
19
37
551
20
38

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							ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
35
DISCOVERY


 	
A/C Logic Relay )


1
K170
A/C Logic Relay

X101
Front A/C Evap-
orator Tempera-
ture Switch






	
 	
 & )

 & )
	
	

	

 #$# (!

 

&$# # % (!

  
	 

  

	 

  




	

 #$# (!

 

&$# # % (!

  

   
)Front A/C Evap-
orator Tempera-
ture Switch

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							ELECTRICAL TROUBLESHOOTING MANUA L
K2   ETM
Compressor Controls
36
DISCOVERY






$  %$

 



    & 
 
A/C Dual Pres-
sure Switch & 	 $ 	 ! %$

  
X225
Front A/C Switch


  & 
 
Front Fan Speed
Switch & 	 

  

#$ 
   &
Condenser Fan
Control Diode 2 &
Front A/C Switch &

12345

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							COOLING FANS
1
ETM K5
DISCOVERY
ELECTRICAL TROUBLESHOOTING MANUAL
CIRCUIT OPERATION
Condenser Fan Operation (MFI±V8)
The Condenser Fans Motors (M113, M121) on
vehicles equipped with MFI±V8 engines operate
when any of the following conditions occur:
3. Coolant temperature exceeds 100C (212F).
4. The air conditioning system is operating.
5. The Engine Control Module (ECM) (Z132)
determines that fuel temperature exceeds 
70C and coolant temperature exceeds 110C
after engine shutdown. When this occurs, the
fans are turned on for approximately 10
minutes after the engine is shut off.
Operation with High Coolant Temperature
 (MFI±V8)
When the Ignition Switch (X134) is in position II,
battery voltage is applied to the Ignition Load Relay
(K127). The relay is energized, applying battery
voltage to the Condenser Fan Relay (K109) and
the Fan Control Module (Z118). If the coolant
temperature exceeds 100C (212F), the
Condenser Fan Coolant Temperature Switch
(X113) closes and energizes the Condenser Fan
Relay (K109) by applying ground to the relays coil.
When the relay is energized, voltage from fuse F3
is applied to the Condenser Fan Motors (M113,
M121) through the relays contacts.
Fan Operation with A/C (MFI±V8)
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 Condenser Fan Relay (K109). When
the Front A/C Switch (X225) is turned On and the
Front Fan Speed Switch (X247) is turned to
positions I, II, III, or IV, ground is applied to terminal
86 of the Condenser Fan Relay. The relay
energizes, applying battery voltage from fuse F3 to
the Condenser Fan Motors (M113, M121).
Operation with the Engine Off (MFI±V8)
The Engine Control Module (Z132) monitors fuel
temperature and coolant temperature through
sensors. When the ECM determines than fuel
temperature is above 70C and coolanttemperature exceeds 110C after engine
shutdown, the ECM will command fan operation for
approximately10 minutes. The ECM turns on the
fans by momentarily grounding the Fan Control
Module (Z118) through the BG wire. When the
timer unit is grounded, it starts a solid state timer
and begins to apply ground from its terminal 9 to
the Condenser Fan Relay (K109) through the BP
wire. With the Condenser Fan Relay energized,
voltage from fuse F3 is applied to the Condenser
Fan Motors (M113,  M121) through the relay
contacts.

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							COOLING FANS
2
K5 ETM
DISCOVERY
ELECTRICAL TROUBLESHOOTING MANUA L
Cooling Fan and Condenser Fan Operation
(MFI±T16)
The Cooling Fan 1 (M141) or Cooling Fans (M141,
M142) and Condenser Fan Motors (M113, M121)
on vehicles equipped with MFI±T16 engines
operate when any of the following conditions occur:
1. The A/C system is operating.
2. The Engine Control Module (ECM) determines
that Cooling Fan and/or Condenser Fan Motor
operation is required.
Cooling Fan Operation without A/C (MFI±T16)
With the Ignition Switch (X134) in position II,
battery voltage is applied to the Cooling Fan Relay
(K190) from fuse F3 of the Satellite Fuse Box 1
(P127). When Cooling Fan Operation is required,
the Engine Control Module (ECM) (Z132) grounds
terminal 86 of the Cooling Fan Relay (K190). The
relay energizes, applying battery voltage from fuse
F3 of the Engine Compartment Fuse Box (P125) to
the Cooling Fan 1 (M141). When Cooling Fan
Operation is no longer required, the ECM removes
the ground supply to the Cooling Fan Relay (K190).
The Relay de±energizes, removing the voltage
supply to the Cooling Fan 1 (M141).
Cooling Fan and Condenser Fan Operation with
A/C (MFI±T16)
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 Condenser Fan Relay (K109). When
Cooling Fan and Condenser Fan operation is
required, the Engine Control Module (ECM) (Z132)
grounds terminal 86 of the Condenser Fan Relay
(K109). The Relay energizes, applying battery
voltage from fuse F3 of the Engine Compartment
Fuse Box (P125) to the Cooling Fans (M141, 142)
and the Condenser Fan  Motors (M113, M121).
When Cooling Fan and Condenser Fan operation is
no longer required, the ECM removes the ground
supply to the Condenser Fan Relay (K109). The
relay de±energizes, removing the voltage supply to
the Cooling Fans (M141, M142) and the
Condenser Fan Motors (M113, M121).

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							COOLING FANS
3
ETM K5
DISCOVERY
ELECTRICAL TROUBLESHOOTING MANUAL
Condenser Fan Operation (300Tdi)
The Condenser Fan Motors (M113, M121) on
vehicles equipped with diesel engines operate
when any one of the following conditions occur:
1. Coolant temperature exceeds 100C (212F).
2. The A/C is operating.
Condenser Fan with High Coolant Temperature
Operation (300Tdi)
When the Ignition Switch (X134) is in position II,
battery voltage is applied to the Ignition Load Relay
(K127). The relay is energized, applying battery
voltage to the Condenser Fan Relay (K109). If the
Coolant Temperature exceeds 100C (212F), the
Condenser Fan Coolant Temperature Switch
(X113) closes and energizes the Condenser Fan
Relay (K109) by applying ground to the relays coil.
When the relay is energized, voltage from fuse F3
is applied to the Condenser Fan Motors (M113,
M121) through the relays contacts.
Fan Operation with A/C (300Tdi)
With the Igntion Switch (X134) in position II, battery
voltage is applied to the Ignition Load Relay
(K127). The relay is energized, applying battery
voltage to the Condenser Fan Relay (K109) when
the Front A/C Switch (X225) is turned on and the
Front Fan Speed Switch (X247) is turned to
positions I, II, II, or IV, ground is applied to terminal
86 of the Condenser Fan Relay (K109). The relay
energizes, applying battery voltage from fuse F3 to
the Condenser Fan Motors (M113, M121).

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							ELECTRICAL TROUBLESHOOTING MANUA L
K5 ETM
Cooling Fans
4
DISCOVERY
A
K5-6
S2045
Z211
Fan Timer Diode
See Ground Dis-
tribution
See Fuse Details 9 C204
0.5 LGP
85 30 C2007See Fuse Details
K127
Ignition Load
Relay 8530
8687
86 87
0.5 GW 0.5 B2.0 WG
0.5 WGS227
C2007
MFI±V8
MFI±T16Blower Controls
E200
K5-8
K5-9
K5-10300Tdi without
EDC
300Tdi with EDC
18 C2171.0 WG
0.5 WG13 C2120.5 WG
1.0 WG
Compressor
Controls
S2015
HJ10
2.0 WG 2.0 WG 2.0 WG
7 C2073 2.0 WG
1.25 UR
Blower Controls Without Air
ConditioningWith Air Condi-
tioning
15
F 6
25 AP127
Satellite Fuse
Box 115
F 15
10 AP126
Fascia Fuse Box

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