What is the data value of BMW mini rear oxygen sensor?

Over 2v- too thin (idle speed 1.5-N20. N552V-N52)；

Equal to 2v- complete combustion;

Below 2v- too strong.

2. After oxygen sensor:

More than 0.45 v-too strong;

Equal to 0.45 V-complete combustion (generally 0.7 V);

Less than 0.45 v-too thin.

3. Intake manifold pressure sensor:

VALTRANIC is used: the absolute pressure is 950 bar and the relative pressure is 50 bar. If the VVT system fails and enters the emergency mode, the data is 350 millibar.

Without VALTRANIC: the relative pressure is 350 mbar (the N54 engine is a twin-turbo engine).

4. Throttle position sensor:

Use VALTRANIC:3%-5%-5% (if it is lower than 3%, the mixture is too thin and the throttle tends to be small; If it exceeds 5%, the throttle valve is dirty and needs cleaning. Or it means that the mixture is too rich and the throttle tends to open wider. )

Valtranic is not included: 2%-3%-3%; if it exceeds 3.5%, it generally means that the throttle is dirty and needs cleaning.

N52:4

With valtranic: 7,

Valtranic: 3 is not included.

V 1+V2=5V

5. Throttle position sensor:

V 1=2V2

6. Oil pressure: greater than 2 bar,

Unplug the oil pressure sensor to 6bar.

The oil level sensor must be installed on the vehicle for testing (do not pull the plug to avoid failure).

7. Water temperature sensor:

Cold car 2000 ohm-(4V)

Hot car 300-400 ohm-(0.8V)

It varies linearly with temperature.

8. Knock sensor:

About 0.3V (generally 1 volt, not more than 3 or 5v) (ignition advance angle delay, adjustment delay).

9. Air flowmeter:

Cylinder 4: 8-9 kg/h-(old car 1 1- 14 kg/h)

Cylinder 6: 12- 13kg/h-(old car 18-20 kg/h)

8 cylinders: 15- 16 kg/h-(old car 26-28 kg/h)

10, VANOS: (when the hot car is idling)

Air inlet: 85 (or 80)

Exhaust:-1 15 (or 120)

Note: when the car starts and cools and the load changes, it should be adjusted from time to time.

1 1, position of eccentric shaft of VALTRANIC:

Mainly depends on whether the change of the position sensor is sensitive or not.

When starting, the valve should be opened to the maximum extent for better starting. At this time, the current of VALTRANIC motor will suddenly rise to a great level.

VALTRANIC 2nd generation: valve lift range: 0.18-9.9mm.

30/30 (difference 1) (generally 26)

Minimum valve lift after adjustment: 0.95mm?

Valve lift: 0.95mm?

If there is any problem: (ignition advance angle is delayed, and will be adjusted later)

12, adjustment value:

Additive adjustment (idle speed): 0.5mg/ stroke (fine positive indication and coarse negative indication).

The standard value of the adjustment value of mixed gas additive is 1 ~ 1. 14, and the adjustment value of mixed gas additive is λ >;

Influencing factors: secondary air injection

Multiplication adjustment (on-load): 7.0% (sparse positive explanation and heavy negative explanation)

If they are all thin, the reason is:

Low fuel pressure

Air leakage in air intake system

λ sensor

Air mass flow

13, static value = standard speed (700)- actual speed.

If it is greater than 0, the cylinder is not working well.

If it is less than 0, the cylinder works well.

If the sum of all cylinder stability values is equal to 0, there is no problem.

14, intake pressure sensor:

No-load voltage: 1. 13V

Fast acceleration voltage: 3.39V v v.

15. Injection time: ordinary engine: generally 2.3ms..

Direct injection engine:1.18ms

16, air-fuel ratio = 14.7kg air/1kg gasoline (complete combustion) = 14.7.

& kloc-0/4.7 or above: the mixture is too thin.

& equal to 14.7: It has just been completely burned.

& less than 14.7: the mixture is too rich.

17, excess air coefficient = actual air-fuel ratio/theoretical air-fuel ratio.

λ is greater than 1: the mixture is too lean.

λ is equal to 1: it has just been completely burned (about 1. 1).

λ is less than 1: the mixture is too rich.

18, fuel pressure:

Low pressure: 6 bar (N20, N55), 5 bar (N52) and 3.5 bar (N46).

High pressure: 50 bar, up to 200 bar.

19, load signal: 8.6%. When the oil cap is opened, the value will decrease.

20. Ignition advance angle: 6.

If the VVT system fails to enter the emergency mode, the ignition advance angle will definitely be delayed, and the acceleration response will definitely not be so fast.