Subaru Legacy/Outback

1999-2003 of release

Repair and operation of the car

Combination of devices - the general information and the principle of functioning of components

Design of a combination of devices

And — the Combination of devices of usual type
In — the Combination of devices of luminescent type
1 — Luminescent rims
2 — the fuel reserve Measuring instrument
3 — the Speedometer
4 — the Tachometer
5 — the engine temperature Measuring instrument
6 — the Control lamp of SRS/AIR BAG
7 — the Control lamp of level of brake liquid / raising of the parking brake
8 — the Control lamp of temperature of ATF (it is activated at ATF overheat over 150 °C)
9 — the Control lamp of refusals of MIL/" check the engine" (warns about violations of serviceability of functioning of a fuel supply system of MPFI)
10 — the Control lamp of a charge
11 — the Control lamp of ABS
12 — the Control lamp of pressure of oil (it is activated at pressure drop of oil below a mark of 14.7 kPas)
13 — the Control lamp of VDC
14 — the Control lamp of "POWER" (blinks at identification of violations of serviceability of functioning of AT)
15 — the FWD Indicator (it is activated at installation in the FWD switch of a safety lock of imitation of the front-wheel mode)
16 — the LO mode Indicator (it is activated at inclusion of the mode of the lowering transfer on models with an additional two-level reducer of a box)

17 — the VDC OFF Indicator (it is activated shutdown of VDC or TCS system)
18 — the Indicator of activation of VDC (it is activated also at operation of TCS)
19 — Indicators of indexes of turns
20 — the Indicator of leaky closing of doors
21 — the Fasten Belts Indicator (it is disconnected 6 seconds later after turn of the ignition key in the situation ON)
22 — the Indicator of inclusion of a driving beam of headlights
23 — the HOLD Indicator (it is activated at transfer of AT to the HOLD mode)
24 — Indicators of position of the lever of the AT selector (functions in any provisions of the ignition key, except ACC and LOCK)
25 — the Indicator of activation of system of an immobilization of the engine
26 — the Indicator of the minimum reserve of fuel (works at reduction of a reserve of fuel approximately to 10 l), - on models with a luminescent combination in addition starts blinking also shining fuel reserve measuring instrument rim
27 — the Indicator of activation of external illuminants
28 — Hours
29 — the Odometer/counter of a distance in kilometers of the current trips / the display of a conclusion of indications of the sensor of temperature of external air
30 — the Handle of installation of hours
31 — the Button of switching/dumping of meter readings of a distance in kilometers of the current trips

Principle of the organization of the drive of an electric speedometer


And — Models with RKPP In — Models with AT 1 — the Mechanism of the drive of the strelochny index 2 — the Speedometer 3 — a speedometer drive Chain	4 — the Combination of devices 5 — the Forward wheel 6 — VSS 7 — TCM

VSS design


1 — the Top casing 2 — the Sealing ring 3 — the Magnetic ring 4 — the Driving key	5 — Nizhny Novgorod a casing 6 — the Conducted sensor shaft 7 — the Rivet 8 — the Hall Sensor

Principle of functioning of VSS


1 — Turns of an output gear wheel of transmission 2 — VSS 3 — Small speed 4 — High speed 5 — the Signal (4 impulses on a turn)	6 — the Combination of devices 7 — a speedometer drive Chain 8 — the Chain of the drive of odometers/counters of a distance in kilometers 9 — ECM 10 — the Module of management of a tempostat

Design of sensors of a reserve of fuel


1 — the Main sensor 2 — the Auxiliary sensor	3 — Floats

Principle of functioning of the measuring instrument of a reserve of fuel


1 — the Combination of devices 2 — the ignition Switch 3 — the Control lamp of the minimum reserve of fuel 4 — the Driver 5 — the Interface	6 — the User CPU 7 — the Measuring instrument 8 — the Auxiliary sensor of a reserve of fuel 9 — the Main sensor of a reserve of fuel

General information

The speedometer, tachometer, the fuel reserve measuring instrument, the engine temperature measuring instrument, and also various control lamps and light indicators are a part of a combination of devices.

Principle of functioning of components

Control lamps and light indicators

The scheme of functioning of control lamps and light is presented in table 26.

* 1: At ignition inclusion the lamp is activated approximately for 6 seconds, then has to go out
* 2: At ignition inclusion the lamp is activated approximately for 2 seconds, then has to go out
* 3: The lamp is activated when raising the parking brake
* 4: The indicator is activated at decrease in a reserve of fuel to a mark of 10 l
* 5: The indicator is activated at inclusion of the mode "HOLD" AT
* 6: At ignition inclusion the indicator is activated approximately for 6 seconds, then has to go out
* 7: The indicator is activated at inclusion of the POWER AT mode
* 8: The indicator is activated at extraction of a key from the ignition lock, and also 60 seconds later after turning of a key in the situation LOCK or ASS
* 9: At ignition inclusion the indicator is activated approximately for 2 seconds, then has to go out
* 10: The indicator is activated at turn of the switch of management of functioning of external illuminants in the first situation
* 11: At ignition inclusion the indicator is activated approximately for 4 seconds, then has to go out

Speedometer

Speed of 60 km/h corresponds to development of 2548 alarm impulses in a minute.

On all cars considered in the present manual the speedometer of electric type using the signals developed by the sensor of the speed (VSS) as the entering information (4 impulses on one turn of the conducted sensor shaft), - models with RKPP, or the module of management of transmission (TCM), - models with AT is used. The scheme of the organization of the drive of a speedometer is submitted on an illustration.

Speed signals from VSS/TCM are given also for modules of engine management (ECM) and tempostat.

Refusal of application of the rotating driving cable as on speedometers with the mechanical drive, allows to reduce the level of the noise background published by transmission and also to avoid such unpleasant moments as a detachment of tips of a cable and vibration of the strelochny index.

Sensor of the speed (VSS)

The inductive sensor of the Hall is the basis for a design of VSS. The sensor is installed on a case of transmission and traces the frequency of rotation of an output shaft of the last, generating 4 alarm impulses on one turn of a shaft of a rotor gear wheel.

Rotation of a driving key forces to rotate a magnetic ring that leads to change of a magnetic field of the sensor of the Hall which starts developing the corresponding alarm impulses (on 4 on one turn of a key) which are given out on a combination of devices, ECM and the module of management of a tempostat.

Tachometer

The chain of the drive of a tachometer is connected to a contour of monitoring of turns of the ECM engine. Change of frequency of rotation of a cranked shaft of the engine leads to directly proportional change to tension in a contour in turn leading to change of magnetic force in a tachometer drive winding.

Measuring instrument of temperature of cooling liquid

The measuring instrument of temperature belongs to type of measuring instruments with the crossing windings.

Information on temperature of cooling liquid arrives from the thermosensitive element established on the engine which resistance changes according to changes of temperature of the under control environment. Change of current involves measurement of magnetic force of a winding and the strelochny index of the measuring instrument forces to move at the demanded size.

At a normal working temperature of the engine (70 ÷ 100 °C) of the shooter of the measuring instrument has to be approximately in a middle part of working range of the scale applied on the dial.

Measuring instrument of a reserve of fuel and indicator of the minimum stock

Sensors of a reserve of fuel are located in the main and auxiliary chambers of a fuel tank and have a float-operated design.

Resistance of a potentiometer of the sensor changes in proportion to change of provision of a float (see table 27).

The measuring instrument of fuel consumption continues to issue indications even at the ignition key turned in the situation LOCK.

Tab. 27 Scheme of sensors of a reserve of fuel

Need for use of two sensors is explained by design features of a structure of the fuel tank divided into two sections (main and auxiliary) due to the need of providing a place under laying of the driveshaft.

The processor of a combination of devices continuously traces the resistive signal developed by the sensor of a reserve of fuel and when lowering resistance to a critical mark (about 7.6 Ohms) and its keeping at this level within about 10 minutes / throughout 10 km of run provides activation of the indicator which is built in in an instrument guard.

Display of a conclusion of indications of the sensor of temperature of external air

Location of the sensor of temperature of external air and ZhK of the display of a conclusion of its indications


1 — temperature Sensor 2 — the Liquid crystal display	3 — the Tachometer

Principle of functioning of the sensor of temperature of external air


1 — temperature Sensor 2 — the Thermistor 3 — the Liquid crystal display 4 — the User CPU	5 — the Combination of devices 6 — VSS (models with RKPP) 7 — TCM (models with AT)

The sensor of temperature of external air equipped with the built-in thermistor issues information on the user CPU which (at the included ignition) compares introduction data with the last registered indication of the sensor kept in his memory at ignition switching off (if that was made no more than 60 minutes ago) and displays the tachometer of the liquid crystal display which is built in assembly minimum of two indications. If the last switching off of ignition was made more than 60 minutes ago, CPU displays the display the indication registered by the sensor.

At a slow speed of the movement of the car heat stream developed by the power unit influences indications of the sensor of temperature, however CPU when receiving from VSS/TCM of the signal corresponding to movement speed lower than 10 km/h provides a conclusion to the screen of the display of the last value kept in his memory when the speed of the movement of the car made more than 10 km/h.