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WIRING DIAGRAM - ENGINE COOLING - Alfa Romeo 159 1.8 Da 01/06
COMPONENTS - ENGINE COOLING - Alfa Romeo 159 1.8 Da 01/06
| Component code | Description | Reference to the operation |
| B001 | JUNCTION UNIT | |
| B099 | MAXIFUSE BOX ON BATTERY | |
| C001 | BATTERY EARTH | - |
| D004 | FRONT/ENGINE COUPLING | - |
| D009 | FRONT/RADIATOR COUPLING | - |
| K036 | ENGINE COOLANT TEMPERATURE SENSOR/SENDER UNIT | - |
| K120 | LINEAR SENSOR FOR FANS | |
| J030 | ENGINE FAN SPEED 1 RELAY | - |
| M010 | ENGINE MANAGEMENT ECU | - |
| N011 | FAN MOTOR | |
| N012 | ENGINE FAN MOTOR - 2 | |
| N086 | ELECTRONIC THERMOSTAT | - |
| O010 | ENGINE FAN ADJUSTMENT RESISTANCE - 1 | |
| O012 | ENGINE FAN 2 ADJUSTMENT RESISTANCE |
COMPONENT LOCATION - ENGINE COOLING - Alfa Romeo 159 1.8 Da 01/06
| Component code | Description | Reference to the operation |
| B001 | JUNCTION UNIT | |
| B099 | MAXIFUSE BOX ON BATTERY | |
| C001 | BATTERY EARTH | - |
| D004 | FRONT/ENGINE COUPLING | - |
| D009 | FRONT/RADIATOR COUPLING | - |
| K036 | ENGINE COOLANT TEMPERATURE SENSOR/SENDER UNIT | - |
| K120 | LINEAR SENSOR FOR FANS | |
| J030 | ENGINE FAN SPEED 1 RELAY | - |
| M010 | ENGINE MANAGEMENT ECU | - |
| N011 | FAN MOTOR | |
| N012 | ENGINE FAN MOTOR - 2 | |
| N086 | ELECTRONIC THERMOSTAT | - |
| O010 | ENGINE FAN ADJUSTMENT RESISTANCE - 1 | |
| O012 | ENGINE FAN 2 ADJUSTMENT RESISTANCE |
DESCRIPTION - ENGINE COOLING - Alfa Romeo 159 1.8 Da 01/06
The radiator and air conditioner condenser cooling system consists of two electric fans operated at two different speeds:- the first speed is activated at a first engine coolant temperature level and a certain air conditioning refrigerant fluid pressure;- the second speed comes on at a higher temperature or pressure.An electrically adjusted thermostat is fitted on this version, which allows the adjustment of the temperature of the engine coolant depending on certain parameters managed by the engine management control unit.In this system the activation of the fan is considerably reduced because the intervention of the electrically regulated thermostat makes it possible to keep the engine correctly thermally balance and the intervention of the fans is only requested when the action of the thermostat is insufficient.The control unit processes the signals and, depending on the parameters set, it either does or does not control the resistance on the thermostat for the advanced opening of the thermostat and, if necessary, activates the fans.There are two engine coolant temperature sensors to manage this function, one fitted on the thermostat and the other on the radiator in correspondence with the outlet hose: the two sensors provide the engine management control unit with information concerning:- engine coolant outlet temperature;- radiator coolant outlet temperature;- information for the control panel instrument;For more details:The thermostat and the fans are operated by three specific relays located in the engine compartment junction unit and a fourth relay located on the duct for the actual fans.The supply line for the thermostat and the fans is protected by three dedicated fuses, located in the engine compartment junction unit.
FUNCTIONAL DESCRIPTION - ENGINE COOLING - Alfa Romeo 159 1.8 Da 01/06
The main injection relay T9 of B1, energized by an (earth) signal coming from pin 62 of connector A of control unit M10, sends a power supply to thermostat N86 via the line protected by fuse F11 of B1.The thermostat N86 then regulates the temperture of the engine coolant depending on given parameters, managed by the engine management control unit M10 (engine speed, load conditions, gear engaged and outside temperature) and is controlled by a signal from pin 4 of connector B of M10.The coolant temperature sensor on the radiator hose K036A manages the electrically controlled thermostat: it receives a reference earth and sends a temperature signal to the engine management control unit M10 to pin 3 and pin 28 respectively of connector A of the engine management control unit M10.The engine coolant temperature sensor on thermostat K36B receives a reference earth and sends a temperature signal to engine control unit M10, to pins 25 and 60 of connector B respectively.If the opening of the thermostat is not sufficient, the activation of the engine cooling fans is required.The relay J30, located on the fan duct, manages the engagement of the fans N11 and N12 at the first speed: the coil and the power line are supplied by the line protected by fuse F6 of the engine compartment junction unit B1.If the engine coolant reaches an initial temperature level, measured by the two sensors K36, or the linear sensor K120 signals to the control unit M10 - pin 56 of connector A - that a certain pressure level has been reached, then the control unit M10 sends a signal - from pin 59 of connector A - which energizes the relay J30, which sends the power supply to the fans N11 and N12 via the additional resistances O10 and O12: the two fans turn together at the first speed (slow).The linear sensor K120 receives a power supply and reference earth from the engine management control unit M10, pin 39 and 23 of connector A.Relays T6 and T7 of the engine compartment junction unit B1 manage the switching on of the two speed fan N11: the coil power lines are protected by fuses F6 and F7 , also in engine compartment junction unit B1 .If the engine coolant reaches a higher temperature level, or the linear sensor K120 signals to the control unit M10 - pin 56 of connector A - that a higher pressure level has been reached, then the control unit M10 sends a signal - from pin 10 of connector A - which energizes the two relays T6 and T7 which send the power supply directly to the fans N11 and N12 which turn together at the maximum speed.
