BMW 3 series E30
Since 1983-1994 of release
Repair and car operation
+ 1. The maintenance instruction
+ 2. Maintenance service
+ 3. The engine
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
- 7. An exhaust system
+ 7.1.2. An exhaust system of cars 318i
- 7.2. System of decrease in toxicity of the fulfilled gases
7.2.2. Self-diagnostics of system of injection Motronic
7.2.3. The processor block (block ESU)
7.2.4. Gauges of system of automatic control of the engine
7.2.5. System of compulsory ventilation картера (PCV-system)
7.2.6. System of catching of steams of gasoline (EVAP-system)
7.2.7. Katalitichesky neutralizer
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. A running gear
+ 12. A body
+ 13. An electric equipment
+ 14. A good advice
The gauge of temperature of a cooling liquid
The gauge represents термистор (the resistor which size of resistance depends on temperature). In process of reduction of temperature of the gauge its resistance increases and on the contrary.
The gauge of concentration of oxygen in exhaust gases
Socket of the gauge of oxygen
Socket of the gauge of oxygen on models 325i 1986-88
The gauge traces the oxygen maintenance in exhaust gases and generates target pressure from 0,1 In (the high maintenance of the oxygen, the impoverished mix) to 0,9 In (the small maintenance of the oxygen, the enriched mix). Changing target pressure from gauges moves on the electronic block of management which defines an oxygen and fuel parity in a gas mixture. The management block regulates a parity of air / of fuel in a mix by the task of time of an open condition of atomizers. At a parity of 14,7 parts of air to 1 part of fuel in an initial mix the maintenance of harmful substances in the fulfilled gases minimum, at such parity neutralizer clears gases with peak efficiency. The electronic block of management together with the oxygen gauge provide maintenance of structure of a gas mixture just at the specified level.
The relay of a heater of the gauge of oxygen
If temperature of the gauge of concentration of oxygen below normal working temperature, i.e. 320 ° With pressure on the gauge is absent. Therefore, until then while the engine will not get warm, on the electronic block of management of a signal from the oxygen gauge the block does not arrive also works in a mode of the opened cycle (preparing a gas mixture automatically).
If after engine warming up, or after not less than 2 minutes of work of the engine, pressure on the gauge not превышаеи 0,45 In at speed of rotation of the engine not less than 1500 rpm the management block will bring a refusal code in memory.
If the gauge or its chain the electronic block of management works in a mode of the opened cycle are faulty, i.e. The block doses out fuel according to the programmed value on its input, instead of according to a signal of the gauge of oxygen.
Correct work of the gauge depends on following conditions:
1. Electric: the low voltage generated by the gauge, very strongly depends on a condition of connections with wires.
2. Givings of external air: the gauge is arranged so that air circulates in its internal space. Every time at removal or installation be convinced of cleanliness of air channels of the gauge.
3. Working temperature: signals from the gauge do not arrive on the electronic block of management until then while the temperature of the gauge will not reach approximately 300 ° S.Etot the factor it is necessary to consider at an estimation of serviceability of the gauge.
4. Qualities of gasoline: use unleaded gasoline is an essential condition of correct work of the gauge. Fill the car only неэтилированным with gasoline.
Besides specified above conditions, at gauge service it is necessary to observe following rules:
1. The flexible conductor and a socket of the gauge of oxygen are not folding and from the gauge are not disconnected. Damage or a separation of a flexible conductor or a socket can negatively affect serviceability of the gauge.
2. It is not supposed hits of a dirt, lubricants and other extraneous components on a socket or on a tower insulator of the gauge.
3. It is forbidden to wipe the gauge all kinds of cleaners.
4. It is forbidden to drop the gauge or carelessly to address with it.
5. Watch correctness of installation of a silicone cover of the gauge to avoid cover fusion because of which gauge refusal is possible.
Appointment of conclusions to the gauge of the maintenance of oxygen
The gauge represents 2 steams of contacts. Idling which one steam it is normally closed, and another – is opened. Near to full opening заслонки the second pair of contacts becomes isolated. At intermediate position заслонки both steams of contacts are opened. Breakage in chains or easing of contacts of the gauge throttle заслонки can cause spontaneous injection of fuel that is at the bottom of unstable work of the engine idling.
Measuring instrument of a stream of air
The removal and installation order is described in subsection 6.4.
Gauges of system of ignition
The procedure for test, removals and installations is described in subsection 184.108.40.206.
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