In addition, the system can monitor the condition of the oil in the engine.
Functions of the ASSYST system
Function for determining the remaining mileage to maintenance
The vehicle mileage between maintenance is divided into two distances:
- initial mileage;
- mileage remaining until the next MOT.
Under the initial mileage understand the minimum distance that the car can go before the next MOT. The initial mileage depends on the following factors.
- The amount of oil filled when changing.
- Generalized qualitative factors (driving style, operating conditions in a given country). These factors are pre-installed in the system at the manufacturer and can be changed using the STAR DIAGNOSIS diagnostic system. These indicators do not depend on specific conditions (e.g. driving style).
Remaining mileage to maintenance
Immediately after changing the oil, the residual mileage is equal to the initial mileage, if the nominal amount was filled during the oil change. The remaining mileage is counted from the current odometer reading to the reading that should be at the next MOT.
The allowable mileage between maintenance is equal to the remaining mileage, which is displayed immediately after an oil change. The maximum possible mileage must not exceed the initial mileage by more than twice (unwanted but acceptable mileage).
The remaining mileage depends on a number of factors.
- Initial run.
- Real driving conditions (number of cold starts, number of engine overspeeds, number of short trips, number of trips with trailer towing).
The sources of information for the ASSYST system are the following systems and devices.
- CDI control unit (N3/9 or N3/10, N3/20, N3/26, depending on engine model) gives information about the operating modes of the engine.
- The ESP system provides information about the speed mode, the mileage (ABS sensors).
- Oil condition sensor (B40) provides comprehensive information on the quantity, temperature and degree of contamination of the oil with the products of its oxidation and wear of the mechanism.
- Coolant temperature sensor, which allows you to specify the operating modes of the engine.
Block diagram of the ASSYST system
VN 9.068
A1. Instrument cluster; 311/4. coolant temperature sensor; 340. Oil condition sensor; L5/7. crankshaft position sensor; L6/1. Left front wheel speed sensor; L6/2. Right front wheel speed sensor; L6/3. Left rear wheel speed sensor; L6/4. Right rear wheel speed sensor; N3/9. CDI control unit; N30/4. ESP control unit
Function for determining the time remaining until maintenance
For cars with low mileage during the year, the ASSYST system may not determine the mileage, but the time remaining until the next MOT.
The time is counted from the moment of oil change. The initial time is determined similarly to the initial mileage and is assumed to be 730 days.
The remaining time at the start of the countdown is equal to the start time.
The maximum remaining time ranges from one to two years.
Oil level and quality indicator
The figures show the indicator of the car modification of 2006 (PR code JK3, speedometer with upper scale divisions in km/h).
VN 9.069
1. Type of indicator if it is necessary to top up the specified amount of oil; 2. Type of indicator for unacceptably low oil quality; 3. Type of indicator with a faulty level sensor and minimum oil condition; 4. View of the indicator when the oil level is lower; 5. View of the indicator when the oil level is above the maximum