ECO Start/Stop Function Is Not Operational As Designed (TT 08/14-C)

Publication date: 2014-08-01
Reference number: TT 08/14-C

ECO START/STOP FUNCTION IS NOT OPERATIONAL AS DESIGNED

DEALER TECH TOPICS; AUGUST 2014

Reference Number(s): TT 08/14, Date of Issue: August 2014

MERCEDES-BENZ:	Model 204 with ECO start/stop
GROUP:	15.10 - Ignition system, general

TOPIC

ECO Start/Stop function is not operational as designed. One or more of the following DTC may be Current and/or Stored: FRONT SAM- B210C16: "The power supply is out of range. The voltage limit has been exceeded." & B219116: "The supply voltage of circuit 30 is out of range. The voltage limit has been reached." REAR SAM: U113E00: "Communication with the battery sensor has a malfunction".

CAUSE / EXPLANATION

The B95 battery sensor data communicated to the SAMR via the LIN bus may not be correct or functional at times.

CORRECTION

Reference Shop Foremen topic on ECO start/stop diagnosis. Review actual values including the battery sensor AV and repair history. Consider replacing the battery sensor and retesting.