Mercedes-Benz S320 engine idle speed is higher, accelerating the "Speed" phenomenon

A mileage of about 120,000 km, chassis design W140, configure the M104 engine and an automated transmission Mercedes-Benz S320 sedan. Consumer report: Inside of a motor vehicle engine fix position, the engine idle pace stays high, assuming that the acceleration, there'll be "Speed" phenomenon.

Take the vehicle: exam uncovered which the motor velocity can fall to 1000r/min, and appreciably bigger when compared to ordinary idle velocity. Organization assessments accelerator pedal, the motor pace increase immediately after slipping again to 2500 ~ 3000 r / min, and risky. Test the accelerator pedal cable, without launch scannersticking phenomenon. Examine the air intake, there is certainly no leakage phenomenon. Connect complete self-diagnosis, the engine program has the next fault codes: "P1580, throttle actuator M33 (Digital Throttle M33) there's a fault"; "P0115, coolant temperature sensor B60 is defective,;" P0507, idle velocity control functionality failure. "clear fault codes, check, fault nonetheless check out the information move, coolant temperature ingestion air temperature, accelerator pedal place signals for example standard; ignition progress angle of -1 ??, isn't typical; throttle angle is 0 ??, is not ordinary Look at the engine circumstances, idle pace is 1000r/min, the large facet. accelerated, discovered once the engine velocity will increase consider a protracted time (about 10s) ahead of slipping back to 1300r/min, the ignition progress angle results in being thirty ?, throttle angle gets 0.3 ??. Transform the ignition change, restart the engine, idling ailment with the ignition progress angle gets -11.

By the upkeep expertise, the idle speed control are usually three explanations: Initially, the throttle actuator problems or weak connections, two accelerator pedal sensor signal is undesirable, 3 is definitely the motor handle module initialization facts reduction. Symptom view within the automobile, the latter two most likely brings about. From the motor compartment to the remaining to locate the electrical manage box components accelerator pedal sensor, you are able to see the sensor cable by way of a mechanical linkage using the formation on the accelerator gm tech2 pedal. Transform the ignition change, slowly depress the accelerator pedal, and afterwards gradually release the accelerator pedal, even though observing the diagnostic knowledge variations, the accelerator pedal sensor sign voltage is amongst 0.35 ~ 4.27V uniform adjust, indicating the accelerator pedal sensor no trouble. Ongoing on the motor handle module for diagnosis, located throttle programming knowledge merchandise "No", this means which the engine manage module doesn't retail store the initial electronic throttle angle benefit. Cause of the malfunction is observed, so he selected the adaptive handle module initialization configurations match the menu goods, according to some information about the accelerator pedal sensor and electronic throttle setting initialization accomplished once the exam, the engine idle smooth, excellent acceleration overall performance, failure to completely reduce.

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