Renault Megane, Scenic

Since 1996 of release

Repair and car operation

Diagnostics of malfunctions

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 a vehicle 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 Sections concerning the given problems are given.
Remember that successful end of search of causes of defect at all is not the black magic accessible to only skilled professional mechanics, and is defined by a combination of certain 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 some times continues to fuse successively, there is no sense in its further replacement — it is necessary to 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.

1. THE ENGINE

The engine is not turned at start attempt

   • connections of plugs of the accumulator (the routine maintenance Schedule) Are weakened or oxidised.
   • the Accumulator it is discharged or faulty (the Head an engine Electric equipment).
   • electroconducting in a starter chain (the Head an engine Electric equipment) Is broken, weakened or separated.
   • the traction relay of a starter or the switch (the Head an engine Electric equipment) Is faulty.
   • the starter (the Head an engine Electric equipment) Is faulty.
   • a teeth of a gear wheel of a starter or gear вента a flywheel (the Head engine Repair, and an engine Electric equipment) Is broken.
   • the cable of weight of the engine (the Head an engine Electric equipment) Is broken or separated.

The engine is turned, but not started

   • the Empty fuel tank.
   • the accumulator (the engine rotates slowly) (the Head an engine Electric equipment) Is discharged.
   • connections of plugs of the accumulator (the Head Maintenance service) Are weakened or oxidised.
   • Zashuntirovany or are damaged ignition components — models with the petrol engine (Heads Maintenance service and an engine Electric equipment).
   • electroconducting in an ignition chain — models with the petrol engine (Heads Maintenance service and an engine Electric equipment) Is broken, weakened or separated.
   • Spark plugs the interelectrode backlash — models with the petrol engine (the Head Maintenance service) is worn out, defective or incorrectly adjusted.
   • the preheat system — diesel models (the Head an engine Electric equipment) Is faulty.
   • the system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release) Is faulty.
   • the valve отсечки fuel — diesel models (the Head of the Power supply system, release) Is faulty.
   • Air in fuel system — diesel models (the Head of the Power supply system, release).
   • Serious mechanical malfunction (for example a camshaft drive) (the Head engine Repair).

Not heated-up engine is difficultly started

   • the accumulator (the Head an engine Electric equipment) Is discharged.
   • connections of plugs of the accumulator (the Head Maintenance service) Are weakened or oxidised.
   • Spark plugs are worn out defects or the interelectrode backlash — models with the petrol engine (the Head Maintenance service) is incorrectly adjusted.
   • It is faulty preheat system — diesel models (the Head an engine Electric equipment).
   • the system of injection of fuel — models with the petrol engine (Heads Maintenance service and an engine Electric equipment) Is faulty.
   • the valve of fast idling — diesel models (the Head of the Power supply system, release) is incorrectly adjusted.
   • the Low compression in engine cylinders (the Head engine Repair).

The heated-up engine is difficultly started

   • the filtering element of the air filter (the Head Maintenance service) Is polluted or blocked.
   • Malfunction of system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release).
   • the Low compression in engine cylinders (the Head engine Repair).

The starter rustles or was roughly linked to a flywheel wreath

   • a teeth of a gear wheel of a starter or a gear wreath of a flywheel (the Head Repair of the engine and an engine Electric equipment) Are broken.
   • Are weakened or there are no fixing bolts of a starter (the Head an engine Electric equipment).
   • internal components of a starter (the Head an engine Electric equipment) Are worn out or damaged.

The engine is started, but immediately глохнет

   • Are weakened or defects electric chains of system of ignition — models with the petrol engine (Heads Maintenance service and an engine Electric equipment).
   • Vacuum leak in the case of a throttle or the inlet pipeline — models with the petrol engine (the Head of the Power supply system, release).
   • the atomizer/malfunction in system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release) Is littered.

Unstable work in an idling mode

   • the filtering element of the air filter of the air filter (the Head Maintenance service) Is blocked.
   • Vacuum leak in the throttle case, the inlet pipeline or the connected hoses — models with the petrol engine (the Head of the Power supply system, release)
   • Spark plugs the interelectrode backlash — models with the petrol engine (the Head Maintenance service) is worn out, defective or incorrectly adjusted.
   • the Unequal or low compression in engine cylinders (the Head engine Repair).
   • cam-shaft cams (the Head engine Repair) Are worn out.
   • it is Incorrectly tense gear приводной a belt (the Head engine Repair).
   • the atomizer/malfunction in system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release) Is littered.
   • the atomizer — diesel models (the Head of the Power supply system, release) Is faulty.

Ignition admissions idling

   • Spark plugs the interelectrode backlash — models with the petrol engine (the Head Maintenance service) is worn out, defective or incorrectly adjusted.
   • high-voltage conducting of spark plugs — models with the petrol engine (the Head Maintenance service) Is faulty.
   • Vacuum leak in the throttle case, the inlet pipeline or the connected hoses — models with the petrol engine (the Head of the Power supply system, release).
   • the atomizer/malfunction in system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release) Is littered.
   • the atomizer — diesel models (the Head of the Power supply system, release) Is faulty.
   • the distributor Cover has burst or is burnt out from within — models with the petrol engine (where it is applied) (the Head an engine Electric equipment).
   • the Unequal or low compression in engine cylinders (the Head engine Repair).
   • ventilation hoses картера (the Head of the Power supply system, release) Are separated or damaged.

Ignition admissions on all operating modes

   • the element of the fuel filter (the Head Maintenance service) Is hammered by a dirt.
   • It is faulty топливоподкачивающий the pump, or low pressure of giving — models with the petrol engine (the Head of the Power supply system, release).
   • the drainage aperture in a fuel tank Is blocked, or the section through passage топливопроводов (the Head of the Power supply system, release) has decreased.
   • Vacuum leak in the throttle case, the inlet pipeline or the connected hoses — models with the petrol engine (the Head of the Power supply system, release)
   • Spark plugs the interelectrode backlash — models with the petrol engine (the Head Maintenance service) is worn out, defective or incorrectly adjusted.
   • high-voltage conducting of spark plugs — models with the petrol engine (the Head Maintenance service) Is faulty.
   • the atomizer — diesel models (the Head of the Power supply system, release) Is faulty.
   • the distributor Cover has burst or is burnt out from within — models with the petrol engine (where it is applied) (the Head an engine Electric equipment).
   • the ignition coil — models with the petrol engine (the Head an engine Electric equipment) Is faulty.
   • the Unequal or low compression in engine cylinders (the Head engine Repair).
   • the atomizer/malfunction in system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release) Is littered.

The engine gives failure by pressing of a pedal of gas

   • Spark plugs the interelectrode backlash — models with the petrol engine (the Head Maintenance service) is worn out, defective or incorrectly adjusted.
   • Vacuum leak in the throttle case, the inlet pipeline or the connected hoses — models with the petrol engine (the Head of the Power supply system, release).
   • the atomizer/malfunction in system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release) Is littered.
   • the atomizer — diesel models (the Head of the Power supply system, release) Is faulty

The engine глохнет

   • Vacuum leak in the throttle case, the inlet pipeline or through hoses — models with the petrol engine (the Head of the Power supply system, release).
   • the fuel filter (the Head Maintenance service) Is hammered by a dirt.
   • It is faulty топливоподкачивающий the pump, or low pressure of giving — models with the petrol engine (the Head of the Power supply system, release).
   • the drainage aperture in a fuel tank Is blocked, or the section through passage топливопроводов (the Head of the Power supply system, release) has decreased.
   • the atomizer/malfunction in system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release) Is littered.
   • the atomizer — diesel models (the Head of the Power supply system, release) Is faulty.

The engine does not develop a total power

   • it is incorrectly established or will pull gear приводной a belt (the Head engine Repair).
   • the fuel filter (the Head Maintenance service) Is hammered by a dirt.
   • It is faulty топливоподкачивающий the pump, or low pressure of giving — models with the petrol engine (the Head of the Power supply system, release).
   • the Unequal or low compression in engine cylinders (the Head engine Repair).
   • Spark plugs the interelectrode backlash — models with the petrol engine (the Head Maintenance service) is worn out, defective or incorrectly adjusted.
   • Vacuum leak in the throttle case, the inlet pipeline or the connected hoses — models with the petrol engine (the Head of the Power supply system, release).
   • the atomizer/malfunction in system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release) Is littered.
   • the atomizer — diesel models (the Head of the Power supply system, release) Is faulty.
   • the injection moment — diesel models (the Head of the Power supply system, release) is incorrectly established.
   • Podtormazhivanie of wheels (the Head Maintenance service and Brake system).
   • coupling Proslipping (the Head Coupling).

The engine gives return blow

   • it is incorrectly established or will pull gear приводной a belt (the Head engine Repair).
   • Vacuum leak in the throttle case, the inlet pipeline or the connected hoses — models with the petrol engine (the Head of the Power supply system, release).
   • the drainage aperture in a fuel tank Is blocked, or the section through passage топливопроводов (the Head of the Power supply system, release) has decreased.
   • the atomizer/malfunction in system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release) Is littered.

At engine work the control lamp of pressure of oil burns

   • Low level of oil, or oil of a wrong grade is filled in.
   • the gauge of pressure of oil (the Head an engine Electric equipment) Is faulty
   • Are worn out the loose leaf of bearings коленвала and-or the oil pump (the Head engine Repair).
   • High working temperature of the engine (the Head of System of cooling, heating).
   • It is faulty редукционный the oil valve (the Head engine Repair).
   • the Hammered mesh filter of a reception tube of the oil pump (the Head engine Repair).

The engine works after deenergizing

   • the Excessive deposit in the engine (the Head engine Repair).
   • High working temperature of the engine the Head of System of cooling, heating).
   • Malfunction of system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release).
   • the Defective valve отсечки fuel — diesel models (the Head of the Power supply system, release).

Noise in the engine

   • Premature ignition (detonation) or a detonation at acceleration or under loading.
   • Wrong installation of a corner of an advancing of ignition/malfunction in ignition system — models with the petrol engine (Heads Maintenance service and an engine Electric equipment).
   • Spark plugs do not correspond to engine type — models with the petrol engine (the Head Maintenance service).
   • the Wrong grade of fuel (the Head Maintenance service).
   • Vacuum leak in the throttle case, the inlet pipeline or the connected hoses — models with the petrol engine (the Head of the Power supply system, release).
   • the Excessive deposit in the engine (the Head engine Repair).
   • the atomizer/malfunction in system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release) Is littered.

Whistle and hissing at engine work

   • Negermetichnost of a lining of the inlet pipeline or the throttle case — models with the petrol engine (the Head of the Power supply system, release).
   • Leak through a lining of a final collector or connection of an exhaust pipe with a collector (the Head of the Power supply system, release).
   • Negermetichnost of a vacuum hose (the Head of the Power supply system, release, the Electric equipment of the engine and Brake system).
   • Damage of a lining of a head of the block of cylinders (the Head engine Repair).

Постукивание or jingle

   • It is worn out клапанный the mechanism or a cam-shaft (the Head engine Repair).
   • auxiliary components (the water pump, the generator etc.) Are damaged.

Low-frequency knock

   • Are worn out шатунные bearings (a roar or the knock probably amplifying under loading) (the Head engine Repair).
   • piston Knock (it is swept most up, when the engine cold) (the Head engine Repair).

2. COOLING SYSTEM

Overheat

   • Insufficient quantity of a cooling liquid in system (the routine maintenance Schedule).
   • the thermostat the Head of System of cooling, heating) Is faulty.
   • radiator channels, or a lattice the Head of System of cooling, heating) Are blocked.
   • the electrofan or a thermoswitch the Head of System of cooling, heating) Are faulty.
   • the Inexact gauge of temperature or the indicator on the panel the Head of System of cooling, heating).
   • the Air stopper in system of cooling the Head of System of cooling, heating).
   • the cover on a broad tank the Head of System of cooling, heating) Is faulty.

Overcooling

   • the thermostat the Head of System of cooling, heating) Is faulty.
   • the Inexact gauge of temperature or the indicator on the panel the Head of System of cooling, heating).

Leak of a cooling liquid outside

   • hoses or ослабли collars of their fastening (the Head Maintenance service) Are damaged.
   • Negermetichnost of tubes of a radiator or a heater the Head of System of cooling, heating).
   • the cover of a radiator the Head of System of cooling, heating) Is damaged.
   • Destruction a cuff of the water pump the Head of System of cooling, heating).
   • Negermetichnost of a lining between the water pump and the block of cylinders the Head of System of cooling, heating).
   • Vykipanie because of an overheat (the Head of System of cooling, heating).
   • Negermetichnost of a stopper-zaglushki of the block (the Head engine Repair).

Leak of a cooling liquid inside (usually in oil картер)

   • Negermetichnost of a lining of a head of the block of cylinders (the Head engine Repair).
   • the Crack in a head or the block of cylinders (the Head engine Repair).

Corrosion

   • Infrequent draining of a liquid and system washing (the Head Maintenance service).
   • the Poor-quality cooling liquid or a liquid of corresponding type (the Head Maintenance service).

3. FUEL AND EXHAUST SYSTEMS

The excessive expense of fuel

   • the Filtering element of the air filter is polluted or hammered (the Head Maintenance service).
   • Malfunction in system of injection of fuel — models with the petrol engine (the Head of the Power supply system, release).
   • the atomizer — diesel models (the Head of the Power supply system, release) Is faulty.
   • Wrong installation of a corner of an advancing of ignition/is damaged ignition system — models with the petrol engine (Heads Maintenance service and an engine Electric equipment).
   • Low pressure of air in tyres (the routine maintenance Schedule).

Leak of fuel and-or fuel smell

   • pipes or connections (the Head of the Power supply system, release) Are damaged or treated to corrosion action a fuel tank.

Excessive noise or smoky exhaust

   • Leak through connections of final system or a collector (the Head Maintenance service and Power supply systems, release).
   • Leak, are treated to action of corrosion or are damaged the muffler or a pipe of final system (the Head Maintenance service and Power supply systems, release).
   • Are broken подвесы because of what the exhaust system concerns bodies or suspension brackets (the Head Maintenance service).

4. COUPLING

The pedal fails or pressed with small resistance

   • it is strongly weakened or the rope (the Head Coupling) has burst.
   • Leak or other malfunction in brake hydrosystem of coupling — where is applied (the Head Coupling).
   • Wrong adjustment of a course of a pedal of coupling (the Head Coupling).
   • It is broken выжимной the bearing or the lever (the Head Coupling).
   • the spring in a press disk of coupling (the Head Coupling) Is broken диафрагменная.

Coupling is not separated (it is impossible to switch transfer)

   • Wrong adjustment of a course of a pedal of coupling (the Head Coupling).
   • the Frictional disk of coupling gets jammed on grooves of an entrance shaft of a transmission (the Head Coupling).
   • the Frictional disk of coupling has stuck to a flywheel or a press disk (the Head Coupling).
   • the block of a press disk (the Head Coupling) Is faulty.
   • It is worn out or densely collected the mechanism of deenergizing of coupling (the Head Coupling).

Coupling proslipping (increase in turns of the engine without increase in speed of the car)

   • frictional overlays of coupling (the Head Coupling) are worn excessively out.
   • Frictional overlays of coupling are polluted by oil or greasing (the Head Coupling).
   • the disk or ослабла диафрагменная a spring (the Head Coupling) Is faulty press.

At inclusion of coupling the car starts to move jerky

   • Frictional overlays of coupling are polluted by oil or greasing (the Head Coupling).
   • frictional overlays of coupling (the Head Coupling) are worn excessively out.
   • Are faulty or deformed press a disk or диафрагменная a spring (the Head Coupling).
   • engine or transmission fastenings (the Head engine Repair) Are worn out or weakened.
   • grooves of a nave of a frictional disk of coupling or an entrance shaft of a transmission (the Head Coupling) Are worn out.

Noise by pressing or release coupling pedals

   • It is worn out выжимной the bearing (the Head Coupling).
   • It is worn out or the rotary axis of a pedal of coupling (the Head Coupling) is not greased.
   • the block of a press disk (the Head Coupling) Is faulty.
   • It is broken диафрагменная a press disk (the Head Coupling).
   • Are broken демпферные springs of a frictional disk of coupling (the Head Coupling).

5. THE MANUAL BOX OF THE GEAR CHANGE

Noise on a neutral at the working engine

   • bearings of an entrance shaft (noise arises only at release coupling pedals, but not Are worn out by pressing) (the Head Transmission) *.
   • It is worn out выжимной the bearing (noise arises only at the pressed pedal of coupling, probably decreases at release pedals) (the Head Coupling).

Noise on one separate transfer

   • Are worn out, damaged or a gear wheel teeth (the Head Transmission) has broken away.*

The complicated gear change

   • coupling (the Head Coupling) Is faulty.
   • draught of a gear change (the Head Transmission) Is worn out or damaged.
   • synchronizer knots (the Head Transmission) * Are worn out.

Vyskakivanie transfers

   • draught of a gear change (the Head Transmission) Is worn out or damaged.
   • synchronizer knots (the Head Transmission) * Are worn out.
   • plugs of inclusion of transfers (the Head Transmission) * Are worn out.

Vibration

   • an oil Lack (the Head Maintenance service).
   • bearings (the Head Transmission) * Are worn out.

Greasing leaks

   • Negermetichnost of an epiploon (the Head Transmission).
   • Negermetichnost of joints of the case (the Head Transmission) *.

* Elimination of the given malfunctions not probably to execute independently, however the information resulted above will allow to reveal a cause of defect.

6. AUTOMATIC TRANSMISSION

Because of complexity of the device of automatic transmission, it is necessary to charge diagnostics and repair of this block to the expert. At the malfunctions which distinct from are described more low, the car it is necessary to send on HUNDRED or to the expert in repair of automatic transmission. Do not hasten to remove transmission, yet do not define a cause of defect as the majority of checks is carried out on the block established in the car.

Негерметичность

Transmissionnaja liquid usually dark. At leaks this liquid cannot be mixed with impellent oil which can easily get on transmission under the influence of an air stream.
To define a leak source, at first clear the case of transmission and surrounding surfaces of a dirt and soot by means of chemical washing-up liquids or the ferry. Give to the engine and to transmission to work (at movement on low speed) then the air stream will be weak also disorder of oil will be near to a leak source. From below the car define a leak place. Most often meets негерметичность following places:
a) the Pallet картера (the Head Maintenance service and Transmission).
b) the Tube probeа measurements of level of oil (the Head Maintenance service and Transmission.
Knots of fastening/tube of system of cooling of transmission (the Head Transmission).

The transmissionnaja liquid brown, or smells as ashes

   • Low level трансмиссионной liquids, or the liquid requires replacement (the Head Maintenance service and Transmission).

Shared problems of a choice of transfer

In the Head 7В check and adjustment of a rope of switching on automatic transmissions are described. Further shared problems which can be because of wrong adjustment of a rope are considered:

a) the Engine is got on the transfers which are distinct from "N" (neutral) or "Р" (parking).
b) the Indicator on the lever of the selector of transfers specifies in the transfer which distinct from is really joining.
The Car moves on "neutral" or "parking".
d) the Complicated gear change or errors at transfer change.
Address to the Head 7В for procedure of adjustment of a rope of switching.

Transmission does not include a hill-climbing gear (a mode "Kickdown") at completely pressed pedal of an accelerator

   • Low level трансмиссионной liquids (the Head Maintenance service and Transmission).
   • Wrong adjustment of a rope of switching (the Head Transmission).
   • the Engine is not started on any transfer or started by the transfer which is distinct from "neutral" or "parking"
   • the switch блокиратора a starter (the Head Transmission) is incorrectly adjusted.
   • Wrong adjustment of a rope of switching (the Head Transmission).

Transmission revolves, switches transfers was late, there are noise or does not set the car in motion on forward or back transfers

There are many plausible reasons of occurrence of aforementioned problems, but independently it is necessary to be limited only to adjustment of level of a liquid. Before to transfer the car HUNDRED or to the expert in transmission repair, check up level of a liquid and its condition as Maintenance service, or Transmission is described in the Head. Result liquid level in norm or replace its and its filter. If the problem remained, the professional help is necessary.

7. POWER SHAFTS

Пощелкивание or a detonation on turns (on slow speed)

   • the Lack of greasing of the SHRUS, it is possible because of damage of a protective cover (the Head Power shafts).
   • the external SHRUS (the Head Power shafts) Is worn out.

Vibration at acceleration or braking (engine)

   • the internal SHRUS (the Head Power shafts) Is worn out.
   • the power shaft (the Head Power shafts) Is bent or deformed.
   • the intermediate bearing of the right power shaft Is worn out — where is applied (the Head Power shafts).

8. BRAKE SYSTEM