ESP control unit, component description - GF42.45-P-5118GM
MODEL 164.1 as of model year 09/Modification Year 08 model refinement package
MODEL 164.8, 251.0/1 as of Model Year 09/modification year 08
Shown on model 164.8
Location
The ESP control unit is located in the left front of the engine compartment.
Illustrated on model 251
Location
The ESP control unit is located in the left front of the engine compartment.
Task
The ESP control unit has the following tasks:
- Control of functions
- Reading in of sensors, pickups and signals
- Evaluating input factors
- Actuation of components
Control of functions
The ESP control unit controls the following systems:
- Electronic Stability Program (ESP)
- Antilock brake system (ABS)
- Acceleration Slip Regulation (ASR)
- Electronic Traction System (ETS)
- Engine braking regulation (EBR)
- Electronic brake force distribution (EBV)
- Brake Assist (BAS)
- Trailer stabilization (Trailer Stability Assist (TSA))
(with code (550) Trailer hitch)
- Hill Start Assist
- Vehicle speed control for downhill driving
(on model 164)
- Tire pressure loss warner (not with code (494) USA version)
- Cruise control
- Variable speed limiter (without code (494) USA version and without code (460) Canada version)
- Speed-sensitive power steering
- Distronic (with code (219) Distronic (DTR))
Reading in of sensors, pickups and signals
The input factors are read in with the following connections:
- Direct line
- Vehicle dynamics CAN
- Engine compartment CAN
Direct line
The following signals and components are read in via a direct line:
- Circuit 30
- Circuit 87
- Tml. 31
- BAS diaphragm travel sensor (A7/7b1)
- BAS release switch (A7/7s1)
- ESP pressure sensor (B34)
- Left front rpm sensor (/)L6/1
- Right front rpm sensor (/)L6/2
- Left rear rpm sensor (/)L6/3
- Right rear rpm sensor (/)L6/4
Vehicle dynamics CAN
The following components are read by the vehicle dynamics CAN:
- Micromechanical turn rate sensor AY pickup (B24/15)
Engine compartment CAN
The signals are read in by the ESP control unit via the engine compartment CAN.
The resultant functions are described in the respective function descriptions (see block diagram or function schematic).
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.
Actuation of components
Components are actuated with the following lines:
- Direct line
- Vehicle dynamics CAN
- Engine compartment CAN
Direct line
The following components are actuated via a direct line:
- BAS solenoid valve A7/7y1
- SPS [PML] solenoid valve (Y10)
Vehicle dynamics CAN
The following components are actuated via the vehicle dynamics CAN:
- Power supply of yaw rate, lateral and longitudinal acceleration sensor
Engine compartment CAN
The signals are transmitted by the ESP control unit via the engine compartment CAN.
The resultant functions are described in the respective function descriptions (see block diagram or function schematic).
| Wiring diagram for electronic stability program (ESP) control unit | Model 164 | PE42.45-P-2101-99MAA | |
| Model 251 | PE42.45-P-2101-99RAA |