Elements of the ignition system of the CVH engine 1.8 dm sq. type R2A
1 – crankshaft V-belt pulley with toothed rim, 2 – crankshaft position and speed sensor, 3 – ignition distributor drive, 4 – drive mounting bolt, 5 – ignition distributor bracket, 6 – distributor rotor, 7 – distributor cover
Operating principle
The ESC electronic ignition control module receives signals from the position and speed sensor, coolant temperature sensor, inlet air temperature sensor and intake manifold vacuum sensor.
Based on these signals, as well as a map of optimal ignition timing angles under various engine operating conditions stored in memory, the ESC microprocessor module controls the current in the primary winding of the ignition coil, determining the moment of interruption of the current in the primary winding of the coil depending on the signals received. High-voltage current is supplied through the ignition distributor to the spark plug wires.
The module then turns on the current in the primary winding for a strictly defined period of time and the process is repeated again, and the ignition advance angle is changed by the module depending on the information received.
The ESC ignition control module performs the following functions:
- determines the engine speed depending on the time interval that passes between successive pulses generated by the teeth of the ring gear moving in front of the position and speed sensor (double cut) between the teeth of the ring gear determines the position of the crankshaft (45° before TDC);
- determines the vacuum in the intake manifold, indicating the degree of engine load;
- based on the information received and the data contained in the memory, it determines the optimal ignition timing angle for the given operating conditions;
- turns the current in the primary winding of the ignition coil on and off, causing the formation of high voltage, which creates the ignition spark.
Electrical diagram of the electronic control circuit of the ignition system type ESC
1 – ESC module, 2 – starter relay, 3 – generator, 4 – starter, 5 – throttle lever damper solenoid valve (dash-pot), 6 – ignition switch, 7 – coolant temperature sensor, 8 – intake air temperature sensor, 9 – crankshaft position and speed sensor, 10 – battery, 11 – ignition coil, 12,13 – fuel octane corrector wire connectors, 14 – diagnostic connector
The ESC module also controls the engine, which actuates the carburetor throttle valve in the idle range, adjusting its position depending on the load (automatic transmission engaged, air conditioning on) and the thermal state of the engine.
Checking the ignition system
The ignition system does not require adjustment. Removing and installing the ignition distributor does not present any great difficulties (see Fig. Elements of the ignition system of the CVH 1.8 dm sq. engine type R2A), especially since it can only be installed in one, correct position.
The ignition distributor is checked using a multimeter. The checking method is given in the table concerning the checking of the ignition system.
ESC Ignition System Test Method
| The element being tested | Measuring between contacts | Meaning | Notes |
| Connection of the crankcase to the ground | "9" and mass "10" and mass | 0 – 0.5 Ohm | Ignition is off |
| Starter relay | "11" and mass | 12 – 14 V | Ignition is on |
| Throttle Lever Damper Solenoid Valve (Dash-pot) | "12" and mass | 12 – 14 V | Ignition is on |
| Coolant temperature sensor | "26" and "27" | – | Ignition is off |
| Incoming air temperature sensor | "15" and "26" | – | Ignition is off |
| Crankshaft position and speed sensor | "22" and "23" | – | Ignition is off |
| Power supply of the primary winding of the ignition coil | "8" and "9" | 12 – 14 V | Ignition is on |
| Fuel octane number corrector | "25" and "9" "24" and "9" | The resistance is infinitely large | Disconnect the ESC module before testing; ignition on |