Component description for the CDI control unit

N3/9 CDI control unit

Location

The CDI control unit sits in the trunk, behind the right side paneling.

Task

The CDI control unit controls, monitors and coordinates the entire engine control.

P07.16-3313-03

Function

The CDI control unit is a subscriber on the Control Area Network (data bus/CAN bus) (CAN) and controls the following systems:

 Fuel supply

 Glowing control

 Injection control

 Exhaust gas recirculation

 Lambda control

 Shut-off control

Communication via the drive LIN takes place via the CAN:

 Instrument cluster (A1)

 Restraint systems control unit (N2/7)

 SAM control unit (N10/10)

 Automated manual transmission control unit (N15/6)

 Heater/air conditioning operating unit (N23)
(for code (I01) Air conditioning Plus)

 ESP control unit (N47-5)

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Communication via the Local Interconnect Network (LIN A) takes place via the following components:

 Glow output stage (N14/2)

 Alternator (G2)

The following components are read in directly by the CDI control unit:

 Hot film mass air flow sensor (B2/5)

 Rail pressure sensor (B4/6)

 Charge pressure sensor (B5/1)

 Coolant temperature sensor (B11/4)

 Charge air temperature sensor (B17/8)

 Accelerator pedal sensor (B37)

 Fuel temperature sensor (B50)

 O2 sensor upstream of TWC (G3/2)

 Crankshaft position sensor (L5)

 Fuel level sensor (M3/3b1)

 Oil pressure switch (S41/1)

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The following components are actuated directly by the CDI control unit:

 EGR switchover valve (Y27)

 Pressure regulator valve (Y74)

 Cylinder 1 fuel injector (Y76/1)

 Cylinder 2 fuel injector (Y76/2)

 Cylinder 3 fuel injector (Y76/3)

 Quantity control valve (Y94)

 Heating O2 sensor upstream of TWC