Acceleration slip regulation (ASR), distinguishing features - GF42.40-P-0003-02A

Models 129, 140, 202 as of 1.6.94, 168, 170, 208, 210 with code (471a) acceleration slip regulation (ASR) 

ASR I Model 126 as of 10/87 up to 08/89 

Features

• Separate hydraulic unit for ABS and ASR
• ASR storage pressure supply from separate charge pump
• ASR control functions 
  • Brake intervention
  • Throttle valve return

ASR II Model 124 (except 124.034/036) as of 01/90 

Model 126 as of 09/89 

Model 129.060/061/066 as of start of production 

Model 201.029 as of 06/90 

Features

• ABS and ASR hydraulic unit combined into a compact hydraulic unit
• ASR storage pressure supply from charge pump in the hydraulic unit and additional charging pump
• Model 124 as of 09/92 EFP with fault memory
• ASR control functions 
  • Brake intervention
  • Throttle valve return

ASR III Model 124.034/036 as of start of production 

Model 129.058/063/067/076 as of start of production 

Model 140 as of start of production 

Manual transmission (as of 10/93) 

Features

• Hydraulic design as for ASR II
• ASR with MSR = engine braking regulation
• Vehicles with module box in engine compartment
• System linking of ASR, EFP and HRM or LH control modules and EZL/AKR control module via CAN data line.
• System with diagnostic fault memory (fixed memory)

  Fault can be read out/erased via the data link connector (38-pin) with pulse counter or via Hand- Held-Tester

• ASR control functions 
  • Brake intervention
  • Throttle valve return
  • Advance angle adjustment - retarded
• MSR control function 
  • Throttle valve opening

ASR IV Model 202.028 as of start of production 

Manual transmission (as of 10/93) 

Features

• Hydraulic unit with two 2/2-way valves per wheel
• Uprated charging pump in wheelhouse of left front fender
• Hydraulic function without pressure accumulator, pressure switch and charging pump
• Internal venting sequence of ASR hydraulics
• Brake fluid reservoir with additional ASR brake fluid check switch and return line from ASR hydraulic unit
• System linking of ASR, EFP and HFM control modules via CAN data line
• ASR with MSR  = engine braking regulation
• System with diagnostic fault memory (fixed memory)

  Fault can be read out/erased via the data link connector (38-pin) with pulse counter or via Hand-Held-Tester

• ASR with manual transmission (as of 10/93)
• ASR control functions 
  • Brake intervention
  • Throttle valve return
  • Advance angle adjustment - retarded
• MSR control function 
  • Throttle valve opening

ASR V Model 129 as of 06/94 

Model 140 as of 06/94 

Model 168 as of start of production 

Model 170 as of start of production 

Model 202 as of 06/94 

Model 208 as of start of production 

Model 210 as of start of production 

Automatic and manual transmission 

Features

• Hydraulic design with 2/2-way valves as ASR IV
• ASR with EBR= E  ngine B  raking R  egulation
• Self-priming high-pressure/return pump
• Hydraulic function without charging pump
• No additional brake bleeding for ASR
• Normal brake fluid reservoir
• ASR OFF switch (ASR OFF)
• Flashing ASR warning lamp
• System networking of ASR, EA, ETC and HFM-SFI, LH-SFI, ME-SFI or MSM control modules and if necessary, DI/KSS control unit via CAN data bus
• System networking with instrument cluster via CAN data bus (as of approx. 01/96)
• System with diagnosis fault memory (read-only storage)
• ASR control functions 
  • Brake intervention
  • Throttle valve return (except diesel engine and gasoline engine with fuel shut-off)
  • Advance angle adjustment - retarded (except diesel engine and gasoline engine with fuel shut-off)
  • Fuel shut-off (gasoline engine with fuel shut-off)
  • Fuel quantity cancellation (diesel engine)
• EBR control function (except gasoline engine with fuel shut-off) 
  • Throttle valve opening (gasoline engine)
  • Fuel quantity increase (diesel engine)

The fault memory can be read out/erased via the data link connector using the Hand-Held Tester