GF00.20-D-2008H Remaining Time, Function
GF00.20-D-2008H Remaining Time, Function
General
The Active Service System (ASSYST), which is integrated in the instrument cluster (A1), determines the current remaining time to the next service as the service interval based on the starting time. The remaining time is equal to the starting time.
In vehicles with engine 646 and with code (MF4) Low-emission engine as per EU4 Group 3, ASSYST, which is integrated in the instrument cluster, determines the current remaining time to the next service as the service interval taking into consideration the driving conditions based on a bonus and penalty principle.
In this case, the remaining time may differ from the starting time.
The remaining distance function consists of the following subfunctions:
- Startup time
- Driving conditions for bonus and penalty principle, with engine 646 and code (MF4) Low-emission engine as per EU4 Group 3
- Remaining time
- Warning threshold (in days)
Startup time
The starting time refers to the maximum operating time in days which can be driven until the next service.
The starting time is stored in the engine data record for the respective engines below and cannot be influenced:
- Engine 642, engine 646 or engine 651:
- 730 days
- Engine 271 or engine 272:
- 730 days
The starting time is automatically reset to its start value following every service when the service scope is reset at the instrument cluster.
The starting time is an internal operand and cannot be shown on the display (A1p1) of the instrument cluster.
The starting time can only be displayed with STAR DIAGNOSIS. The instrument cluster display shows the remaining time.
Driving conditions for bonus and penalty principle, with engine 646 and code (MF4) Low-emission engine as per EU4 Group 3
The driving conditions are the following data which are recorded in driving mode:
- Travel distance
- Load torque
- Rpm
- Engine oil level
- Engine oil temperature
- Coolant temperature
The data for calculating the travel distance is received by the instrument cluster by way of the Controller Area Network bus class C (engine compartment) (CAN C) from the ESP control unit (N30/4).
The instrument cluster receives the remaining data from the following engine control unit via CAN C:
- CDI control unit (N3/20), with engine 642
- CDI control unit (N3/21), with engine 646
- CDI control unit (N3/28), with engine 651
- ME-SFI [ME] control unit (N3/29), with engine 271
- ME-SFI [ME] control unit (N3/23), with engine 272
An assessment is made based on this data, which is broken down as follows:
- Optimal driving conditions:
- Few cold starts
- No high engine speeds
- Few short-distance trips
- Few trips with a trailer
- Unfavorable driving conditions:
- Many cold starts
- High engine speeds
- Many short-distance trips
- Many trips with a trailer
Optimal driving conditions
Even with optimal driving conditions a penalty is issued instead of a bonus.
In this case, a value of one day is applied for each day that has passed.
In other words, only 1 day is calculated for one day that has passed (bonus/penalty = 0 days).
Unfavorable driving conditions
With unfavorable driving conditions as well, a higher penalty is issued instead of a bonus.
In this case, a value of 2 days is applied for each day that has passed. In other words, 2 days are calculated for one day that has passed (penalty ≤ 1 day).
Refilling of engine oil has no influence on the remaining time.
Remaining time
Immediately after resetting the service scope the remaining time is equivalent to the starting time.
The remaining time is the time remaining until the next service.
The remaining time can only be shortened for vehicles with engine 646 and code (MF4) Low-emission engine as per EU4 Group 3 based on the bonus and penalty principle outlined above.
This provides the remaining times listed below as a function of the particular engine with the associated starting time:
- Engine 642 or engine 651 with a starting time of 730 days:
- Maximum and minimum remaining time = 730 days
- Engine 646 with a starting time of 730 days:
- Maximum remaining time = 730 days
- Minimum remaining time = 365 days
- Engine 271 or engine 272 with a starting time of 730 days:
- Maximum and minimum remaining time = 730 days
The remaining time appears in the instrument cluster display. The remaining time is only relevant in the case of vehicles with low annual mileage. The remaining distance is generally displayed.
The time information is supplied to ASSYST, which is integrated in the instrument cluster, by the timer integrated in the instrument cluster.
Warning threshold (in days)
Using Star Diagnosis, a warning threshold of between 5 and 30 days, with an increment of one day, can be set for the remaining time. The basic adjustment is 30 days.
