Renault Megane, Scenic

Since 1996 of release

Repair and car operation

The general description of search of malfunctions in electric equipment system

The electric chain consists of electric components, switches, the relay, engines, fuses, the relay of a return current, electroconducting. To find precisely malfunction in an electric chain, schemes of electric connections are given in the end of this Management.
Before diagnostics of an electric chain, at first study the scheme of electric connections. If some elements refuse simultaneously, the problem can be connected with the fuse or weight.
Electric malfunctions are usually caused by the simple reasons, type treated to action of corrosion of connections, defective connection with the weight, the fused fuse or the defective relay (be guided by Section the General description of fuses and the relay). Visually examine a condition of all fuses, wires and connections in an applied chain before test of elements. Use schemes of electric connections precisely to define a malfunction place.
The basic tools demanded for search electric malfunction, tester of a chain or the voltmeter; a stroboscope; an ohmmeter; the accumulator and a set of loading resistance. Before search of malfunctions with instrumentations, use the scheme of electric connections to define, where to do connections.
To find a place of rupture of electroconducting, stir electroconducting. This method of research can be used together in other tests described in following subsections.
Except ruptures of the connections, two basic types of damage of an electric chain - not closed chain or short circuit.
The damages of a chain caused by rupture, prevent current receipt to elements.
Short circuit is usually caused by damage of isolation of electroconducting which supposes that the food wire has concerned or other wire or the earthed element of a body. Short circuit leads перегоранию a safety lock.

Finding of not closed chain

REMOVAL

1. To check up not closed chain, connect one conducting by a tester of a chain or the voltmeter to a negative pole of the battery. 2. Connect other conducting of a checked chain preferably more close to the accumulator or the fuse. Include ignition. 3. If pressure is present, the chain between a socket and the accumulator is serviceable. 4. Continue to check the chain rest in the same way. 5. When the point at which pressure is absent is found, malfunction is between this point and previous испытуемой a point with pressure. The majority of malfunctions can be caused broken, treated to action of corrosion or the weakened connections.

Search of a place of short circuit

REMOVAL

1. Before the beginning of search of a place of short circuit disconnect an electric equipment from a chain. 2. Remove the corresponding fuse from a chain and connect a tester or the voltmeter on fuse connection. 3. Include ignition. 4. If pressure is present, in a chain there is a short circuit. 5. If pressure is absent, it specifies in internal damage of an electric equipment.

Short circuit finding on weight

REMOVAL

1. The negative plug of the accumulator is connected to a car body. It means that the engine, transmission and a body forms a chain part. Opened or treated to action of corrosion elements can cause a range of short circuits in an electric chain, up to full refusal of a chain. 2. Check up, whether the component is well earthed. Connect the plug of a cable of the accumulator an ohmmeter to obviously serviceable earthed point. Connect other conducting on checked grounding. The ohmmeter indication should be zero; if is not present, check up connection as follows. 3. If grounding is faulty, clear to naked metal contact surfaces of weight, at assemblage reliably tighten connections; if the wire clip is established, use washers with jags to guarantee good connection. Grease connection by vaseline or other lubricant.