Contents: Superficial inspection 🠛 Voltage in the ignition system 🠛 Sources of malfunctions 🠛 Other causes of malfunctions 🠛
You will not be able to fix control unit malfunctions yourself. Failures may affect the vehicle's performance, as the emergency program ensures that the ignition is not completely turned off when certain data is lost. Renault 19 can drive, but with a significant loss of power.
To check the control unit, the Renault workshop has a so-called test case, with which the entire ignition system of the Renault 19 can be systematically checked via the diagnostic connector.
Therefore, there is no point in replacing any normally working part due to suspicion or after checking it "by eye". In addition, the control devices of individual engines are different and are not interchangeable.
All of the above indicates that self-repair in the absence of appropriate control and measuring devices is a mistake; it is better and cheaper to contact a Renault auto repair shop.
Anyone who wants to find the cause of a malfunction in the ignition system must search systematically. A precise check of the following ignition system elements is described below.
Superficial inspection
- Are the wires and connecting contacts firmly connected to the ignition coil and control unit?
- Are there any cracks or burn marks from spark discharges on the ignition coil housing?
- Is there any damage to the distributor cap?.
- Check the tightness of the installation and the condition of the high-tension central wire and spark plug wires. Electronic ignition systems are much more likely to leak current and spark than older ignition systems.
- Disconnect the spark plug wire and remove the spark plug.
- Reattach the spark plug wire and position it on the engine body so that it has good ground contact.
- Have an assistant crank the engine.
- If strong spark discharges jump between the spark plug electrodes, then there is current in the ignition system.
- If there are no spark discharges, then you need to carry out a check according to the instructions below.
Voltage in the ignition system
In addition to the complete failure of the ignition system due to low voltage, even a small lack of voltage can cause significant malfunctions. Therefore, a voltmeter is best suited to check the voltage in this case.
Remember that control and measuring instruments can only be connected and disconnected when the ignition is off.
1. Connect the voltmeter to the "+" terminal (yellow cable) ignition coils and ground.
2. If the voltage is around 11.5V, see below.
3. If there is no voltage or it is less than the mentioned value, then this may be a consequence of the reasons described.
4. Leave further testing to specialists from the auto repair shop, since during one of the subsequent checks a new ignition module must be connected, and during the other a new control unit.
Sources of malfunctions
- Battery status (degree of charge).
- Broken ignition switch wires.
- The ignition switch in contacts B1 or A2 is faulty.
- Broken wires between the ignition switch and the multi-pin connector of the ignition module or control unit.
Other causes of malfunctions
If the ignition coil produces a charge for a spark, but it does not reach the last link of the chain, namely the spark plug, then it is necessary to conduct further checks of the following components:
Original version on our portal [www.RenaultBook.ru]
- Plug connections of high voltage wire to ignition coil.
- High voltage wire.
- Spark plug wire tips.
- Spark plugs.