Contents: Knock sensor ↳ Ignition coil ↳
Since September 1988, a contactless parametric ignition system without a distributor has been installed on engines with a displacement of 1.3 dm³ (engine code JBA).
The control unit receives signals from the sensors and selects the ignition timing that is optimal for all operating conditions.
The ignition coil is mounted on the engine and has two primary and two secondary windings. Each of the two secondary windings supplies a spark to two cylinders, one of which ignites the mixture in one cylinder, and the other is supplied to the other cylinder in the exhaust stroke.
Knock sensor
Removing the knock sensor
1 – knock sensor; 2 – connector; 3 – knock sensor mounting bolt
Detonation is a spontaneous explosive self-ignition of the working mixture in the engine cylinders. The detonation sensor is installed on the engine cylinder block, registers engine vibration and transmits the corresponding signals to the control unit. When detonation occurs, the control unit sets a later ignition timing, thereby eliminating detonation. The detonation sensor is installed on the cylinder block between cylinders 2 and 3, 10 cm below the intake manifold.
Removal
To remove the knock sensor, disconnect the ground wire, drain the coolant, remove the connector, unscrew the mounting bolt and remove the sensor.
Ignition coil
The ignition coil is checked using an ohmmeter.
| Primary winding resistance: | |
| – contact ignition system, engine 1.1 dm³ up to 12/85 | 1.2 – 1.4 Ohm |
| – contactless ignition system, engines 1.3, 1.4 1.6 dm³ and 1.1 dm³ with 1/86 | 0.72 – 0.88 Ohm |
| – contactless ignition system, 1.6 dm³ RSi engine with catalytic converter | no more than 1.6 Ohm |
| Secondary winding resistance: | |
| – contact ignition system, engine 1.1 dm³ up to 12/85 | 5000 – 9000 Ohm |
| – contactless ignition system, engines 1.3, 1.4 1.6 dm³ and 1.1 dm³ with 1/86 | 4500 – 7000 Ohm |
| – contactless ignition system, 1.6 dm³ RSi engine with catalytic converter | 13500 – 16500 Ohm |