ENGINE MANAGEMENT NODE NCM

2.0 16V JTD, 2.2 16V JTD

The Engine Management Node NCM (1320) for the injection system is fitted in the engine compartment by the left wheel arch.

The NCM is the flash EPROM type, i.e. it can be reprogrammed from the outside using diagnostic equipment without any operations to the hardware and incorporates the absolute atmospheric pressure sensor.

DESCRIPTION

The NCM manages the injection system assembly including:

- the operation of checking the injection and pollutant emissions;

- the driving comfort strategies;

- the anti-starting function;

- the emergency strategies;

- the operation of the fans and the warning lights (*);

- the control of the water heating systems (*);

- the fault diagnosis and memorizing of faults;

- the speed regulation function (*);

- the dialogue with the collection of multiplex network nodes (*)

The NCM guarantees the electronic control of the following elements:

- injectors;

- turbo pressure regulation solenoid;

- fuel high pressure regulator;

- EGR exhaust gas recirculation regulation valve;

- EGR valve casing solenoid valve;

- pre and post-heating control unit (post-heating interruption);

- device for excluding fuel pressure pump 3rd cylinder;

- swirl actuator solenoid valve.

- refrigeration interruption.

- additional heater activation (*).

(*) depending on the version

The NCM also supplies the following information:

- engine speed: to the on-board computer.

- instant consumption: to the on-board computer.

PIN OUT

(*) depending on the version

ENGINE COOLING FUNCTION - (Integrated in the NCM)

In addition to the injection, the NCM also controls the engine cooling function by:

- controlling the starting and stopping of the engine cooling fan(s);

- controlling post-ventilation (6 minutes max);

- Controlling the switching on of the engine coolant temperature overheating warning light;

- controlling the engine coolant temperature sensor/sender unit;

- diagnosing the operation of the fan(s);

- acquiring the engine coolant temperature;

- managing problems or faults.

Function summary diagram

A, VAN

B, CAN

(*) depending on the version

CONNECTION; SIGNAL; SIGNAL TYPE

(*) depending on the version

POST-VENTILATION

After the engine has been switched off, the NCM controls the engine temperature and, if the coolant exceeds a certain level (*) (105° C) it activates the engine cooling fans.

This post-ventilation takes place at low speed for a maximum of 6 minutes after the engine has been switched off.

(*) depending on the version

FAULT MANAGEMENT

If there are operating problems or faults, in order to safeguard the operation of the power unit, the NCM:

- controls the operation of the fan at high speed.

- controls the flashing of the engine coolant overheating warning light in the instrument panel (*).

- excludes the operation of the air conditioning system compressor (AC/OUT).

(*) depending on the version

AIR CONDITIONING COOLING FUNCTION (Integrated in the NCM)

Injection NCM functions:

Controlling the starting and stopping of the (engine cooling) fan(s).

Acquisition of pressure in air conditioning system refrigeration circuit.

Function summary diagram

A, VAN

B, CAN

(*) depending on the version

CONNECTION; SIGNAL; SIGNAL TYPE

AIR CONDITIONING SYSTEM PRESSURE SWITCH - (8007)

The pressure switch, identified by a black connector, is the piezoelectric type and supplies a voltage proportional to the pressure in the refrigeration circuit.

The electric signal supplied by the sensor is transmitted by wire to the NCM and then sent, via the multiplex network, to the Body Computer Node.

1, Pressure switch

Voltage supplied at a pressure of 1 bar + 0.5 volt

Voltage supplied at a pressure of 31 bar +4.5 volt

DESCRIPTION

The pressure switch, fitted on the air conditioning system condenser, has the task of measuring the pressure in the refrigeration circuit.

Depending on the information received, the NCM:

- authorizes the starting of the fan (for cooling the climate control condenser)

- authorizes the activation of the air conditioning system compressor.

CONDENSER COOLING FUNCTION

The NCM controls the activation of the fan:

- at low speed if the pressure is higher than 10 bar (stopping if the pressure is below 7 bar).

- at high speed if the pressure is higher than 22 bar (stopping if the pressure is below 19 bar).

The Body Computer Node "BSI" controls the activation of the fan:

- at medium speed if the pressure is higher than 17 bar (stopping if the pressure is below 14 bar).

FAULT MANAGEMENT

If there are faults with the pressure switch, the NCM:

- switches on the diagnostic warning light in the instrument panel

- excludes the activation of the air conditioning system compressor.

INTAKE AIR TEMPERATURE SENSOR - (1310)

The intake air temperature sensor is incorporated in the flow meter and has the task of measuring the temperature of the intake air.

DESCRIPTION

Depending on the information received, the NCM:

- regulates the temperature of the intake air (controlling the intake air heater solenoid valve).

the signal from the outside air temperature sensor (6415) fitted on the exterior rear view mirror is used by the NCM to carry out consistency tests. The outside air temperature sensor is controlled by the right front door node (9050).

FAULT MANAGEMENT

If there are problems or faults with the intake air temperature sensor, the NCM uses a replacement value of 50°C.