GF00.20-P-0004TX Active Service System (ASSYST Plus), Function

GF00.20-P-0004TX Active Service System (ASSYST PLUS), Function
- MODEL 219.3

General information
Calculation of the service date is determined via ASSYST. Other maintenance items are carried out by ASSYST PLUS.
ASSYST PLUS determines, from measured values or variables determined there from as well as from data stored in its read-only memory, the next service date due for the vehicle in question. Both distance-related and time-related variables are taken into account. ASSYST PLUS can be configured, enabling it to be adapted to various vehicle uses. This is implemented in the central gateway control unit (N93).

The central gateway control unit (N93) is connected via the CAN engine compartment (CAN-C) and the CAN interior compartment (CAN-B) to the control units in the vehicle and to the instrument cluster (A1).
In the configuration of the maintenance algorithm it is determined whether the required data are determined completely by it or whether they are taken over from other modules such as from ASSYST. ASSYST only takes into account the oil change intervals, while ASSYST PLUS considers the entire vehicle maintenance. ASSYST PLUS is implemented as a module in parallel with ASSYST.

Conduct during the vehicle's first 250 km
ASSYST PLUS is primarily associated with the CAN messages provided by the instrument cluster (A1). For the instrument cluster (A1) it is possible to reset the main odometer within the vehicle's first 250 km. Once this limit of 250 km is reached it is no longer possible to reset the instrument cluster (A1).Within this distance ASSYST PLUS does not perform any calculations at the maintenance items. However, the distance traveled of 250 km, upon reaching the main odometer threshold, is considered once in the calculation and evaluation of the maintenance items. ASSYST PLUS does not give this main odometer threshold further consideration.
The following modules are integrated into the central gateway control unit (N93):
- System diagnosis
- ASSYST
- ASSYST PLUS

Evaluations of the data
Assessment of the engine oil is determined via the oil sensor (oil level, temperature and quality) (B40) using ASSYST (engine 113.967 only).
Individual or a number of stored service items with their intervals (km and/or time, target date) are assigned to the basic items.
In the history memory, all the service events are stored and can be read out at any time using STAR DIAGNOSIS. The service calculation module calculates an optimum service scope, using the data of all the integrated modules, via an internal computation process.
This service scope takes the following into consideration: model designation, date, mileage and service-relevant special equipment as well as retrofitted components.
If the service date has been reached, the service display in the instrument cluster (A1) is activated automatically via ASSYST PLUS.

Display
The display is provided by the multifunction display (A1p13) in the instrument cluster (A1). The following notes with service code can appear:
- Service X in.....days
- Service X in.....km or miles
- Carry out Service X

The service date is displayed at the earliest 1,000 km or 30 days before the next service. The service display consists of the word "Service" followed by the respective service code and, as desired, "+" (optional).
The service code includes the time required and is classified from A to H.
- Code A service scope of up to 1 h
- Code B service scope of up to 2 hrs.
- Code H service scope of up to 8 hrs.

The service interval can also be displayed in the multifunction display (A1p13) upon driver request or automatically as the remaining distance when a value exceeds a warning threshold.

Engine oil monitoring (engine 113.967 only)
In the multifunction display (A1p13) the oil starvation or the oil overfilling is displayed as a service symbol with text. In addition, it is possible to detect oil replenishments. If oil is topped up, a quantity rebate, which may extend the service interval, is assigned. Depending on the evaluation of the engine oil quality, the service interval on gasoline and diesel engines is 15,000 to 40,000 kilometers.

The information on the engine oil quality can be taken into account when determining the service interval. To do this, STAR DIAGNOSIS must be connected and changed accordingly in the menu items "General maintenance"and "Overall maintenance".

Technology and variables
In order to determine the monitored service interval, ASSYST PLUS requires the values of various variables.
In addition to the evaluation factors, which depend on the real-life driving conditions, quality factors may also be used to determine the monitored service interval (remaining distance and remaining time). For data recording purposes, various measured values are required which are put together as follows.
The following data are required by the CAN interior (CAN-B):
terminal status terminal 15 (indirect)
- The vehicle speed
- Total odometer reading (km)
- Day cycle counter
- date
- Term. 61

The following data are required by the CAN engine compartment (CAN-C):
- Pedal value
- Engine speed
- Cylinder shutoff
- Oil pressure
- Oil temperature
- Oil level
- Oil quality (engine 113.967 only)
- Engine torque, static
- Engine torque, maximum
- Engine torque, minimum
- Engine temperature
- Engine off time
- Vehicle lateral acceleration

For data relating to oil level and engine oil temperature, the ME-SFI [ME] control unit (N3/10) reads in the data from the oil sensor (oil level, temperature and quality) (B40). These are read in by ASSYST in the central gateway control unit (N93) and are used for calculating the service time (engine 113.967 only).

Diagnosis of ASSYST PLUS is performed using STAR DIAGNOSIS. Entry is via the central gateway control unit (N93), which is connected to the CAN diagnosis (CAN-D).

Calculation of the next service date is calculated via ASSYST PLUS in the central gateway control unit (N93) and displayed in the multifunction display (A1p13).

Before the instrument cluster (A1) can be replaced, the trip odometer must be read out. Following this, the instrument cluster (A1) can be replaced with a new one.

Prior to programming the key ID in the instrument cluster (A1), the read out trip odometer must be written into the new instrument cluster (A1). Only after this may the key ID programming process be performed.
In the event of an error in the instrument cluster (A1) or in the EIS control unit (N73) no more service data will be transmitted and they will remain at the last updated status.

If however, on the instrument cluster (A1) or with STAR DIAGNOSIS, a service confirmation, but no service has been performed, then this service confirmation must be reset immediately. Only the last confirmation can be reset.