What is Mercedes ESP with ASR?
They include the anti-lock braking system (ABS), ASR Acceleration Skid Control and Brake Assist BAS which, in the event of a detected emergency braking manoeuvre, can increase the brake pressure and thereby shorten the stopping distance.
What’s the difference between ASR and ESP?
ASR – Anti Slip regulation – brakes a front drive wheel that looses traction when you stomp on the gas via the ABS system. ESP – Electronic stability control – Controls the car in when it gets into a spin condition by braking a wheel (any 4) It has a yaw sensor and steering angle sensor.
When does the ABS / ASR light come on?
Hi I have just joined this forum hoping to get some direction on my problem.I have a 1991 500sl with acceleration slip regulation (ASR). My problem is that the ABS/ASR light comes on when driving approx.30metres and stays on.This started ocuring after I had the vehicle serviced which included a brake check.
How does ASR work on a Mercedes Benz?
There is a special procedure with bleeding of brakes on cars with ASR using a special loom. AS I said in my previous post above, there are sensors for all four wheels. The two rear ones are in the diff, and measure each axle shaft rotation speed. * torque reduction via the electronic drive by wire throttle, which throttles back the engine.
What should resistance be for ABS and ASR?
The sensors should have a resistance of around 1000 ohms and produce >100mV ac when the wheel is spun by hand. ASR will use a sensor at each wheel. As ASR uses a refinement of the ABS system, you need to check the ABS/ASR hydraulic control unit in engine compartment.
Where is the rear sensor on an ASR car?
The rear sensor is in the right hand side of the diff nose on my cars with ABS only, but I was under the impression that ASR had two rear sensors, one on each drive shaft or hub, there must be somebody out there who can confirm this and provide a location.
What was the problem with the ASR on my 1992 500SL?
I started having a problem with the ASR system on a 1992 500SL. I was driving on the highway when the ASR sensor light came on and the car defaulted to a “limp home mode”: The engine output power was reduced and I was able to make almost home; after stopping at a red light the battery light came on and the car completely stalled.
What causes the ASR light to come on on a Mercedes 500SL?
Everything pointed to the Electronic Accelerator Actuator (that checked out okay as well). After discussing the past few months with the car, we established that my problem was moisture in the R25 sensor (throttle positioning sensor) causing the ASR light to come on and the engine to go into the LH mode.
What happens when the ASR light comes on?
I was driving on the highway when the ASR sensor light came on and the car defaulted to a “limp home mode”: The engine output power was reduced and I was able to make almost home; after stopping at a red light the battery light came on and the car completely stalled. I restarted the car and the ASR light was off and the car drove normally home.
How much does it cost to fix an ASR problem?
Two motors relating to the ASR system were replaced by the service shop: ($ 1,500 Parts & Labor). The car was running fine for three months then the ASR problem returned. The repair shop then replaced the ASR sending unit: ($ 680.00 Parts & Labor).