Land Rover Discovery Etm 1995 2nd Edition Rover Manual
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ELECTRICAL TROUBLESHOOTING MANUAL ETM K2 Compressor Controls 29 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 34 DISCOVERY & ! (! !% ) ) Engine Control Module (ECM)Compressor Clutch Relay ) Z132 Engine Control Module (ECM) K108 Compressor Clutch Relay !!# (! !!# (! %# $ (! $ (! R550001 19 37 551 20 38
ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
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DISCOVERY
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Compressor Controls
36
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12345
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, II, 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.
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 Motor 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 Motor 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 Fan Motors (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).