View of engine compartment |
N3/9 | CDI control unit |
P07.16-4126-06
Location
The CDI control unit is located at the left next to the engine.
Task
The CDI control unit and the powertrain control unit (N127) operate in an electrical network with the sensors and actuators to form the engine management for engine 626.
The following systems and functions are controlled and coordinated by these control units according to input signals:
Fuel supply
Control of glow system
Injection quantity control
Diagnosis and fault storage
Drive authorization system (DAS 4) and immobilizer
Thermal management
Torque interface
Alternator interface
Exhaust gas recirculation
Exhaust treatment
Start/stop
The CDI control unit has an internal atmospheric pressure sensor. The complete communication with the CAN network takes place over the powertrain control unit as a gateway.
Input and output signals
The following input signals are evaluated by the engine management, which also issues the corresponding output signals:
Direct input signals
Direct output signals
CAN input signals
CAN output signals
LIN input signals
LIN output signals
Input factors over a direct line | Initial parameters over a direct line | Supplemental information |
Terminal 15 | – | – |
Circuit 30 (fused) | – | – |
Circuit 31 | – | – |
Terminal 87 | – | – |
Hot film mass air flow sensor (B2/5) | – | – |
Intake air temperature sensor (B2/5b1) | – | – |
High pressure fuel pressure sensor (B4/6) | – | – |
Charge air pressure and temperature sensor (B4/32) | – | – |
Camshaft Hall sensor (B6/1) | – | – |
Coolant temperature sensor (B11/4) | – | – |
High pressure EGR temperature sensor (B16/10) | – | |
Low pressure exhaust gas recirculation temperature sensor (B16/14) | – | |
Temperature sensor upstream of diesel particulate filter (B19/9) | – | – |
Temperature sensor upstream of turbocharger (B19/11) | – | – |
DPF differential pressure sensor (B28/8) | – | – |
Accelerator pedal sensor (B37) | – | – |
Fuel temperature sensor (B50) | – | – |
Exhaust pressure sensor (B60) | – | – |
Oxygen sensor upstream of catalytic converter (G3/2) | – | – |
Crankshaft Hall sensor (B70) | – | – |
Throttle valve actuator (M16/6) | – | – |
Exhaust flap controller (M16/57) | – | – |
Oil pressure switch (S43/1) | – | – |
Low pressure exhaust gas recirculation actuator (Y27/7) | – | – |
High pressure exhaust gas recirculation actuator (Y27/8) | – | – |
Supplemental Restraint System control unit (N2/10) | – | – |
– | Circuit 15 relay (K40/8kG) | – |
– | Circuit 87M relay (K40/8kN) | – |
Oxygen sensor upstream of catalytic converter (G3/2) | Oxygen sensor upstream of catalytic converter (G3/2) | – |
– | Throttle valve actuator (M16/6) | – |
– | Exhaust flap controller (M16/57) | – |
– | FSCU (N118) ground signal fuel pump ON | – |
– | Fuel filter heating element (R54/1) | – |
– | High pressure exhaust gas recirculation actuator (Y27/8) | – |
– | Low pressure exhaust gas recirculation actuator (Y27/7) | – |
– | Cylinder 1 fuel injector (Y76/1) | – |
– | Cylinder 2 fuel injector (Y76/2) | – |
– | Cylinder 3 fuel injector (Y76/3) | – |
– | Cylinder 4 fuel injector (Y76/4) | – |
– | Boost pressure control pressure transducer (Y31/5) | – |
– | Coolant thermostat shutoff valve pressure transducer (Y88) | – |
– | Quantity control valve (Y94) |
Input factors via the drive-LIN (LIN C1) | Initial parameters via the drive-LIN (LIN C1) | Supplemental information |
Alternator (G2) | Alternator (G2) | – |
Glow output stage (N14/3) | Glow output stage (N14/3) | – |
Input factors via drive train CAN (CAN C1) | Initial parameters via drive train CAN (CAN C1) | Supplemental information |
Fuel system control unit (N118) | Fuel system control unit (N118) | – |
Fully integrated transmission control unit (Y3/8n4) | Fully integrated transmission control unit (Y3/8n4) | – |
Powertrain control unit (N127) | Powertrain control unit (N127) | – |
Input factors over engine CAN (CAN C) | Initial parameters via engine CAN (CAN C) | Supplemental information |
Instrument cluster (A1) | – | Via user interface CAN (CAN HMI), electronic ignition lock control unit (N73), chassis FlexRay (Flex E) and powertrain control unit (N127) |
Supplemental Restraint System control unit (N2/10) | – | Via user interface CAN (CAN HMI), electronic ignition lock control unit (N73), chassis FlexRay (Flex E) and powertrain control unit (N127) |
Front SAM control unit (N10/6) | – | Via interior CAN (CAN B), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Climate control control unit (N22/1) | – | Via interior CAN (CAN B), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Electronic Stability Program control unit (N30/4) | – | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
AIRMATIC control unit (N51/3) (with code 483 (Dynamic handling package 2.0 incl. ADS+) with code 489 (AIRMATIC))) | – | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
Radar sensors control unit (N62/1) (with CODE 23P (Driving assistance package)) | – | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
Left front door control unit (N69/1) | – | Via interior CAN (CAN B), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Electronic ignition lock control unit (N73) | Electronic ignition lock control unit (N73) | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
Steering column tube module control unit (N80) | – | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
Powertrain control unit (N127) | Powertrain control unit (N127) | – |
Diagnostic connector (X11/4) | Diagnostic connector (X11/4) | Via diagnostic CAN (CAN D), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Input factors via drive train sensor CAN (CAN I) | Initial parameters via drive train sensor CAN (CAN I) | Supplemental information |
NOx sensor control unit downstream of diesel particulate filter (N37/7) | NOx sensor control unit downstream of diesel particulate filter (N37/7) | |
NOx sensor control unit downstream of SCR catalytic converter (N37/8) | NOx sensor control unit downstream of SCR catalytic converter (N37/8) | |
AdBlue® control unit (N118/5) | AdBlue® control unit (N118/5) |
Body
The housing of the CDI control unit is made of diecast aluminum and the cover is made of corrosion-proof sheet steel. The CDI control unit is water proof and dust proof.
Power supply
The CDI control unit is supplied with power by "circuit 30 fused" and, with the ignition on, by "circuit 87". In the operating voltage range it has both short-circuit protection and reversed polarity protection. Power is supplied through several engaged parallel pins connected in parallel to relieve the electrical connections.
Ground connection
"Circuit 31" ground connection is connected through multiple ground lines to the internal combustion engine ground point (W11).
Variants
The variants of the engine management, for exampled country and exhaust variants, are activated with XD over the variant coding. Replacement of the CDI control unit is not necessary.