LEXUS RX 300

1998-2003 of release

Repair and car operation

Diagnostics of malfunctions

The description of diagnostics of electronic control systems and codes of malfunctions are resulted in the Head of System of an electric equipment of the engine.

In the given section the most simple scheme of finding-out of the reasons of malfunctions and the refusals occurring in knots and systems of the car is offered. Refusals and their possible reasons are broken into groups on the basis of the relation to certain components or car systems, as for example the engine, cooling system, etc., besides, in the text references to chapters and the sections concerning given problems are given.

Remember that successful end of search of causes of defect is defined by integrity of a complex of good knowledge and the patient, regular approach to problem research. To move always follows from simple to difficult, to lead up each check to the logic end and to try not to pass the obvious facts - everyone can forget to fill fuel in a fuel tank or to leave for the night included lighting devices.

And, at last, always it is necessary to try to make an accurate picture of development of malfunction and to undertake corresponding steps on relapse prevention. If refusal of an electric equipment was the result of infringement of quality of contact, check up at the same time a condition of all other contacts and electric sockets of system. If the same safety lock has fused some times successively, there is no sense in its further replacement - try to find out a cause of a failure. Remember that failure of a minor component can be a sign of infringement of functioning of more important knot or the whole system.

The engine

Obligatory conditions of start of any petrol engine are serviceability of giving of an air-fuel mix in cylinders and timely искрообразование on spark plugs.

First of all it is necessary to make sure of serviceability of giving of fuel.

To define, whether the spark is formed, turn out spark plugs, insert them into tips and separately put to weight. Thus it is not necessary to keep a wire or a tip hands, - take advantage of the isolated flat-nose pliers. Ask to start the assistant the engine. If the spark is absent, try to define a cause of a failure.

The engine is not turned at attempts of its start

1. Plugs of the battery or ослабло fastening on them of tips of wires are oxidised.
2. The battery is discharged or faulty. If tips of wires are not oxidised and reliably fixed on battery plugs, turn the ignition key in position ON, then include headlights and-or windscreen cleaners, - if they do not function, - the battery is discharged.
3. Transmission it is inexact it is established in position P.
4. Rupture in a chain of system of start.
5. The starter gear wheel is jammed in a gear wreath приводного a disk.
6. The traction relay of a starter is faulty.
7. The starter is faulty.
8. The ignition switch is faulty.

The engine is turned, but not started

1. Start is incorrectly made. Operate according to Section Start of the engine and the movement beginning.
2. It is faulty or is not disconnected иммобилизатор the engine.
3. The emergency switch of the fuel pump is faulty.
4. The fuel tank is empty, or poor-quality fuel is filled.
5. The air filter is strongly polluted. Vacuum leaks in elements of giving of air, malfunction in a control system of injection of fuel and ignition take place.
6. The battery (the engine is turned too slowly) is discharged.
7. Plugs of the battery or ослабло fastening on them of tips of wires are oxidised.
8. The fuel pump is faulty, or its relay is damaged, - on hearing check up pump inclusion at ignition inclusion.
9. Components of system of ignition are damaged or excessively humidified.
10. Spark plugs are worn out or faulty, or the candle backlash is incorrectly exposed.
11. Rupture in a chain of system of start.
12. Electroconducting of the coil of ignition, or or ослабло fastening of wires on coil plugs is torn off or disconnected.
13. The safety lock of the block of engine management is damaged, is faulty control system any of gauges of the engine.
14. Low pressure of a compression.

The starter functions without проворачивания the engine

1. The starter gear wheel is jammed.
2. Teeths of a gear wheel of a starter or wreath приводного a disk are worn out or damaged.

Start of the cold engine is complicated

The Cold engine see also is started badly, works unstably.

1. Low level of a charge of the battery.
2. Power supply system components, or electric equipments are faulty.

Start of the hot engine is complicated

See also Прогретый the engine it is badly started, works unstably.

1. The air filter is littered.
2. Power supply system components, or electric equipments are faulty.
3. Fuel does not arrive to injectors.
4. Insufficient compression in cylinders.

Starter gearing occurs is too noisy or with difficulty

1. Teeths of a gear wheel of a starter or wreath приводного a disk are worn out or damaged.
2. Are lost, or bolts of fastening of a starter are insufficiently tightened.

The engine is started, but at once глохнет

1. It is faulty иммобилизатор the engine.
2. Electroconducting, or ослабло fastening of wires on plugs of the coil of ignition or the generator is faulty.
3. Power supply system components, or electric equipments are faulty.
4. Base installations of the block of management of the engine (ECM) are broken.
5. Damage to system of release and decrease in toxicity of the fulfilled gases (ОГ) takes place.
6. Depression losses on the throttle case, the inlet pipeline or through vacuum hoses take place.

Stability of work of the engine on single turns is broken

1. Depression losses take place. Make sure of reliability of a tightening of fixture, check up the fact and quality of fastening on the unions on the inlet pipeline of all vacuum hoses. Hear to the working engine by means of a stethoscope or a piece of a fuel hose - presence of a hissing sound testifies to leak presence. Not less an effective utilisation of a soap solution for check.
2. Serviceability of functioning of components of the power supply system or electric equipment is broken.
3. Passableness of the valve of system of operated ventilation картера (PCV) is broken.
4. Passableness of the air filter is broken.
5. The fuel pump does not provide giving of enough of fuel to injectors.
6. Leaks through a lining of a head of cylinders take place, - measure a compression in engine cylinders (the Engine see the Head).
7. Working ledges of cams of a camshaft are worn out.

Admissions in work of cylinders on single turns take place

1. Spark plugs are worn out or polluted or the candle backlash is incorrectly exposed.
2. Malfunction of components of the power supply system or electric equipment takes place.
3. Electroconducting is faulty В/В.
4. Poor-quality fuel is filled, or passableness of the fuel filter is broken.
5. Depression losses in the inlet pipeline or through шланговые connections take place.
6. Low or different compression in cylinders.
7. Work of a control system as the engine is broken.

Admissions in work of cylinders of the engine take place at car movement on transfer

1. The fuel filter is hammered or power supply system pollution takes place.
2. Spark plugs are faulty or polluted or the candle backlash is incorrectly exposed.
3. Malfunction of components of the power supply system or electric equipment takes place.
4. Electroconducting is faulty В/В.
5. Components of system of decrease in toxicity of the fulfilled gases are faulty.
6. Low or different compression in cylinders.
7. The ignition system is faulty.
8. Depression losses on the throttle case, the inlet pipeline or through vacuum hoses take place.

The engine spontaneously глохнет

1. Adjustment of turns of idling is broken.
2. Passableness of the fuel filter is broken, or the moisture or a dirt has got to the power supply system.
3. Refusal of components / information gauges of the power supply system takes place.
4. Components of systems of decrease in toxicity of the fulfilled gases are faulty.
5. Spark plugs are faulty or polluted or the candle backlash is incorrectly exposed.
6. Depression losses on the case of a throttle or through vacuum hoses take place.

The engine does not develop full capacity

1. Malfunction of components of the power supply system or electric equipment takes place.
2. The air cleaner is littered.
3. Spark plugs are faulty or the candle backlash is incorrectly exposed.
4. The ignition coil is faulty.
5. Level ATF (see the Head of Adjustment and car routine maintenance) has fallen.
6. Transmission revolves.
7. The fuel filter is hammered and-or the dirt/moisture has got to the power supply system.
8. Poor-quality fuel is filled.
9. Low or different compression in cylinders.

There are claps in system of an admission or shots in release system

1. Serviceability of functioning of components of the power supply system or electric equipment is broken.
2. Defect in a secondary contour of system of ignition (destruction of insulators of spark plugs or damage В/В of wires) takes place.
3. The system of injection of fuel requires adjustment, or its components are worn excessively out.
4. Depression losses on the throttle case, the inlet pipeline or through vacuum hoses take place.
5. Gets jammed valves.
6. The order of connection В/В of wires is broken.

At movement with acceleration or uphill there are detonation sounds

1. Poor-quality fuel is filled.
2. Power supply system components, or electric equipments are faulty.
3. Spark plugs not that type are established.
4. Base installations ECM are broken.
5. The detonation gauge is faulty.
6. Depression losses take place.

The engine continues to work after поворачивания a key in position OFF

1. Idling turns are excessively high.
2. Malfunction of an electric equipment or components of a control system of the engine takes place.
3. The valve of a purge of an adsorber of system of catching of steams of fuel (EVAP) is faulty.
4. High working temperature of the engine (level ОЖ has fallen, the thermostat is faulty, the radiator is hammered or the water pump is faulty).
5. Tightness of injectors is broken.

Engine electric equipment

Decrease in capacity or insufficient charge of the battery

1. The belt of a drive of the generator is worn out or damaged, or adjustment of its tension is broken.
2. Level of electrolit is insufficient or the battery is strongly discharged.
3. Plugs of the battery or ослабло fastening on them of tips of wires are oxidised.
4. The generator does not provide a demanded current of gymnastics.
5. Rupture in an electroconducting chain зарядного a contour.
6. Short circuit on "weight" of electroconducting creates constant leak of a current developed by the battery.
7. Internal defect of the battery takes place.

The control lamp of gymnastics does not die away at increase in turns

1. The tension приводного a belt is weakened.
2. The regulator of pressure and-or the generator is damaged. Disconnect a wire (D +) from an underside of the generator and include ignition. Further check up a condition of a regulator of pressure of the generator.
3. Generator brushes are worn out.
4. The wire between the generator and a pressure regulator is damaged.
5. The combination of devices is faulty.

The control lamp of gymnastics does not light up at поворачивании a key in position ON

1. The control lamp has failed.
2. The generator is faulty.
3. Defect of the printed-circuit board, conducting in the block of a combination of devices or a lamp cartridge takes place.

The control lamp of gymnastics does not die away at поворачивании a key in position OFF

1. Diodes are punched.

Starter

Contact plugs of electroconducting should be reliably fixed and are not oxidised!

• If the starter is not turned, at first it is necessary to make sure, that on the plug №50 traction relays are present pressure (a minimum 10). At negative results check up a condition of electroconducting of a contour of a current of a starter.
• For check of serviceability of operation of a starter at full pressure of the battery execute following actions:
• Not including transfers, turn a key in position ON;
• Перемкните plugs 30 and 50 starters a wire section not less than 4 мм².
• If the starter works faultlessly, it is necessary to search for a cause of defect in wires to a starter. If the starter does not earn, it should be checked up in the removed condition.

The starter does not rotate at поворачивании a key in position START

1. The battery is discharged.
2. Перемкните plugs 30 and 50 starters: if the starter rotates, check up on breakage brought to the lock of ignition a wire 50, also estimate a condition of the switch of a starter.
3. The weight wire is torn off, or its quality клеммного connections is broken.
4. Easing of force of a current owing to infringement of quality or oxidation of contact connections.
5. There is no pressure on the plug 50 traction relays as a result of electroconducting breakage, or damage of the switch of a starter.

The starter rotates slowly and does not turn a cranked shaft

1. The battery is discharged.
2. Summer oil is filled in.
3. Passage of a current owing to poor-quality contacts is complicated.
4. Coal brushes do not adjoin to a collector, заедают in directing, are worn out, broken, made oily or polluted.
5. Insufficient distance between brushes and a collector.
6. The collector in grooves or has scorched and was made oily.
7. There is no pressure on the plug 50 (a minimum 8).
8. The bearing is broken.
9. The traction relay is faulty.

The starter "seizes", but provides only рывкообразное проворачивание the engine

1. The gear wheel drive is faulty.
2. The gear wheel is polluted.
3. The gear wreath приводного a disk is damaged.

The starter gear wheel does not leave gearing with a gear wreath of a flywheel/privodnogo of a disk

1. Components of a drive of a gear wheel are polluted or damaged.
2. The traction relay is faulty.
3. The returnable spring ослабла or was broke off.

The starter continues to work after отпускания the ignition key

1. The traction relay is jammed, - immediately switch off ignition and replace the traction relay.
2. The ignition lock is not disconnected, - disconnect the battery, replace the lock.

The power supply system

The fuel expense is excessive

1. The air filter is polluted or hammered.
2. Pressure of a rating of tyres does not suffice or tyres not are established that size.
3. The engine has mechanical damages. Check up a compression, in case of need make corresponding regenerative repair.
4. Turns of idling and the maximum turns of a cranked shaft are excessively high.
5. Malfunctions of components of the power supply system, electric equipment or electronic control.
6. Leaks in system of an admission of air.
7. Damages to system of release and decrease in toxicity ОГ.

Leaks of fuel and-or a gasoline smell take place

1. Leaks in lines of giving of fuel or ventilating lines take place.
2. The fuel tank is overflowed. Refuelling make only before automatic switching-off of a pistol.
3. Take place leak/evaporation from lines of power supply systems and decrease in toxicity ОГ.

The engine is not started

1. At starter inclusion the fuel pump (it is not audible noise from work) does not work. Slightly knock on the pump case to release заевшую a detail. Check up serviceability of giving of pressure on the pump (check up serviceability of a safety lock and reliability of fastening of contact plugs of corresponding electroconducting).
2. The relay of the fuel pump is faulty.
3. Залипли valves of injectors. Check up injectors, if necessary replace. Check up pressure giving on injectors.
4. There is no signal from the ignition or gauge ECT gauge. Check up a condition of its electroconducting, poll memory of system OBD II.
5. Are damaged, littered or негерметичны fuel pipelines, there are defects of hoses.
6. The fuel filter is littered.
7. In an inlet path as a result of tightness infringement подсасывается superfluous air.
8. Vacuum pipelines are damaged, or infringement of tightness of their planting takes place.
9. The regulator of pressure of fuel is damaged, - check up residual pressure.
10. The gauge of position throttle заслонки (TPS) is damaged.
11. There is no food ECM.
12. Ventilation of a fuel tank is hammered, the filter in a tank is littered.

The cold engine is started badly, works unstably

1. Maintenance CO mismatches standard requirements, - make corresponding measurement, check up idling turns.
2. Gauge ECT is faulty.
3. Pressure of fuel mismatches demanded value.
4. In an inlet path as a result of tightness infringement подсасывается superfluous air.

Прогретый the engine is badly started, works unstably

1. Негерметична system of an admission of air. Check up inlet system. For this purpose leave the engine to idle and moisten places of consolidations and connection on an inlet path with gasoline. If the number of turns increases by short time, eliminate not tight places.
2. The return valve of the fuel pump is damaged.
3. Leaks in fuel system.
4. The raised pressure of fuel in the power supply system.
5. Malfunction of system EVAP.
6. It is hammered or crumpled returnable топливопровод to a tank.
7. Залипли valves of injectors. Check up injectors, if necessary replace. Check up pressure giving on injectors.
8. There is no signal from the gauge of ignition of the Hall or the gauge of temperature of a cooling liquid. Check up a condition of corresponding electroconducting, poll system OBD II.
9. In an inlet path as a result of tightness infringement подсасывается superfluous air.
10. The pressure regulator is damaged, - check up residual pressure.
11. Gauge TPS is damaged.
12. There is no food ECM.

The engine works with faults

1. Connections of electroconducting of the fuel pump are broken from time to time. Check up sockets of electroconducting and safety locks of the fuel pump, gauge MAF and the relay of the fuel pump.
2. Poor quality of fuel, formation of steam stoppers.
3. Weak giving of fuel.
4. The fuel filter is faulty.
5. The fuel pump is faulty.
6. Injectors are faulty.
7. The ljambda-probe is faulty, infringements in a chain of quality management of a mix or there is no heating of a ljambda-probe.
8. It is faulty TPS.
9. The final collector or reception pipe of system of release of the fulfilled gases (there are leaks ОГ) is damaged.
10. Malfunction of system EVAP.
11. Залипли valves of injectors. Check up injectors, if necessary replace. Check up pressure giving on injectors.
12. There is no signal from the gauge of ignition of the Hall or gauge ECT. Check up electroconducting, poll memory ECM on presence of codes of malfunctions.
13. In an inlet path as a result of tightness infringement подсасывается superfluous air.
14. Are damaged or негерметичны vacuum pipelines
15. The pressure regulator is damaged, - check up residual pressure.
16. There is no food ECM.

The engine works with faults on transitive modes and in an idling mode

1. Негерметична system of an admission of air. Check up connections of inlet system. Start the engine and moisten with gasoline of connection of components of a soaking up path. If engine turns quickly increase, eliminate a tightness cause of infringement.
2. Idling adjustment is incorrect. Check up TPS and ljambda-adjustment.

The hot engine is not started

1. Incorrect adjustment of the maintenance WITH. Check up the maintenance WITH and idling.
2. Too a high pressure in fuel system