The correct operation of the ignition module determines not only the start of the engine, but also its stable operation in all modes. To fully check the health of this element of the ignition system, you need laboratory equipment. However, preliminary results can also be obtained in the field.
Operation, malfunctions of the VAZ2115 ignition module
This is an electrical device that creates a high voltage (30000V) and transmits it to the spark plugs. A number of car owners call this device a coil, which is not entirely true, because the latter (in the amount of 2 pieces) is included in the module. The first coil is "responsible" for 1, 4 cylinders, the second - for 2, 3. There are also a pair of switches located in the module. All elements are combined under a plastic housing. Finding the module under the hood is easy; high-voltage wires are suitable for it. The main signs of improper operation of the module include the loss of power, its failures with a sharp increase in speed, unstable idle, idle cylinders (1, 4 or 2, 3). All these problems can be attributed to the ignition module, provided that the DS, IAC, and DMRV sensors are in good working order.
Methods for checking the VAZ2115 module
Before starting testing the device, it is necessary to make sure that the block of wires connected to it is in good condition. You will need a tester for this. Take the disconnected block, touch one probe of the device to the contact "A", the other to the ground. Turn on the ignition and look at the tester's scale: the voltage should be within 12V. Its absence may indicate a fuse malfunction. At the next stage of checking the block, take a control light, connect it between contacts "A", "B". Ask the assistant to turn the starter: the lamp will blink. If this is not the case, then there may be an open circuit in the wires leading to the contact "A". Do the same with pin "B".
The easiest way to check the functionality of a module is to replace it with a known good one. But there are some nuances here. The very first Samaras were equipped with an ignition module. In later versions, there is an ignition coil, and the switch is included in the ECU, so there is no separate module as such. This must be taken into account if you decide to use a donor machine.
Another way to check is to measure the resistance. To do this, touch the tester probes to the module terminals, which are used to connect high-voltage wires; between the contacts leading to 1, 4 (2, 3) cylinders, the resistance will be in the range of 5.4 kOhm. If the measured resistance is correct, but the nature of the malfunction remains the same, then use the method of "shaking" the module: knock lightly on the device with the engine running. Changes in its operation indicate poor contact between the elements inside the housing of the ignition module.
