MODEL | 218 |
up to model year 2014 |
A91b1 | Electric power steering torque sensor |
A91m1 | Electric power steering actuator motor |
N68 | Electrical power steering control unit |
P46.35-2050-05
Location
The electrical power steering control unit is attached to the electric power steering actuator motor.
Task
The electrical power steering control unit has the following tasks:
Reading in of sensors and signals
Evaluation of input factors
Actuation of components
Transmission of requests/information
Reading in of sensors and signals
The input factors are read in via the following connections:
Direct line
Chassis CAN (CAN E)
Direct line
The following sensor is read in via a direct line:
– Electric power steering torque sensor
Chassis CAN
The following signals are read in over the chassis CAN:
– Steer Assist torque request and wheel speeds, from Electronic Stability Program control unit (N30/4) (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or from Premium Electronic Stability Program control unit (N30/7) (with CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG vehicles))
– "Drivetrain operational" status and engine speed, from ME-SFI control unit (N3/10) (with gasoline engine) or from CDI control unit (N3/9) (with diesel engine)
– Steering angle and steering angle speed, from steering column tube module control unit (N80) detected by steering angle sensor (N49)
– Current status and requested steering wheel angle of parking system control unit (N62) (with CODE 235 (Active Parking Assist))
Evaluation of input factors
The input factors which are read in are evaluated by the integrated microprocessor, the relevant components are then actuated and requests/information are output.
Actuation of components
The following component is actuated directly:
- Electric power steering actuator motor
Transmission of requests/information
The following requests/information are sent over the chassis CAN:
– Request to display warning message on instrument cluster (A1)
– Steering torque, steering angle speed and Steer Assist status to Electronic Stability Program control unit (except CODE 233 (DISTRONIC PLUS), except CODE 990 (AMG vehicles)) or Premium Electronic Stability Program control unit (with CODE 233 (DISTRONIC PLUS) or with CODE 990 (AMG vehicles))
– Current status from electrical power steering control unit
Technical data |
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Electrical power steering (ES) control unit | ||||
Voltage supply | V | 12 | – | Operating voltage |
Voltage limits | V | 9.0 | – | Lower limit value |
V | 16.0 | – | Upper limit value | |
Power consumption | mA | 400 | – | Standby |
A | 1 – 80 | – | Action (depending on steering power) | |
– | – | – | Quiescent current | |
mA | < 0.3 | – | Maximum quiescent current | |
– | – | – | Minimum no-load current | |
Reverse polarity protection | – | – | – | Yes |
Additional specific parameters | – | – | – | None |
Special features | – | – | – | None |
Flash capability/coding capability | – | – | – | Yes/yes |