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9.2 Traction Systems (ASR, ETS) and Speed-sensitive Power Steering (SPS)   >   11 Diagnosis - Function Test (ASR only)

Test step/Test scope Test condition Nominal value Possible cause/Remedy 1) 1.0 Brake torque control circuit Lift rear of vehicle so that both rear wheels can be rotated freely. Secure vehicle! Engine: at Idle Selector lever in transmission range "D". Apply WOT using accelerator pedal. CAUTION! Should ASR not come into effect: Release accelerator pedal to idle speed. The rear wheels are noticeably braked; simultaneously the return/pressure pump can audibly be heard operating. Engine speed is reduced to appprox. 1000 rpm. The ASR warning lamp (A1e21) will blink. 23, DM, Engines, Vol. 3, section 6.4. 2.0 Switching off ASR using ASR OFF switch (S76/5) Engine: at idle Selector lever in transmission range "N". Press ASR Off switch (S76/5). Selector lever in transmission range "D". Slowly press on accelerator pedal. The ASR warning lamp (A1e21) will remain on. The engine speed will not be reduced. The rear brakes will not be applied. The ASR warning lamp (A1e21) will blink. 23 31.1 1) Observe Preparation for Test