Engine ignition distributor with single overhead camshaft
- Type - non-contact, with built-in ignition coil
- Ignition advance mechanism - electronic
- The order of operation of the cylinders is 1-3-4-2
Ignition coils
GDI Engine Management System - Dual Ignition Coil (filled with composite material)
MPI engine management system:
- type - one ignition coil (filled with composite material), built into the ignition distributor
- primary winding resistance, Ohm - 0.5-0.7
- resistance of the secondary winding, kOhm - 15-22
- secondary winding resistance (engine management system 4G13-MPI), kOhm - 8.5-11.5
Spark plug
Spark plug:
- engine management system GDI - NGK - IZFR6B
- MPI engine management system - DENSO -K16PR-U11, NGK-BKR6E-11
- MPI engine management system since 2000 (4G13-MPI) — NGK - BKR5E-11, DENSO - K20PR-U11
Interelectrode gap, mm
- engine management system GDI - 0.5-0.6 (max 0,75)
- MPI engine management system - 1.0-1.1
Misfire detection sensor
- Engine - 4G13-MPI, 4G93-GDI since 2000
- Resistance, Ohm - less than 0.1
General information
Single overhead camshaft engine (MPI)
Interruption of the circuit of the primary winding of the ignition coil creates a self-induction EMF in the secondary winding of the ignition coil. The high voltage thus generated is fed through the ignition distributor to the corresponding spark plug.
The order of operation of cylinders 1-3-4 -2.
When a high voltage is applied to the spark plug electrodes, a spark discharge occurs, which ignites the compressed air-fuel mixture in the combustion chamber.
The electronic engine control unit breaks the primary circuit of the ignition coil, thereby adjusting the ignition timing.
The electronic engine control unit, using a crankshaft position sensor, determines the angular position of the crankshaft and provides the optimal ignition timing depending on the engine operating mode. When operating a car in high mountains (at high altitude below sea level) or driving with a cold engine, the ignition timing advances slightly to ensure optimum engine performance. Moreover, when knocking occurs, the ignition timing is gradually reduced until knocking stops. When the automatic transmission shifts gears, the ignition timing is reduced to reduce engine torque, thus eliminating the car's jolt when changing gears.
The 4G13-MPI engine since 2000 has been equipped with a non-contact ignition system, other spark plugs have been installed and a misfire detection sensor has been added.
Engine with two overhead camshafts (GDI)
This ignition system has two ignition coils (A and B) with built-in power transistors that supply high voltage to the spark plugs of cylinders 1, 4 and 2, 3, respectively. Interruption of the primary circuit of the winding of the ignition coil A induces an EMF of self-induction (high voltage) in the secondary winding of coil A. The high voltage thus created is applied to the spark plugs of cylinders No. 1 and 4. At this moment, sparking occurs simultaneously on the electrodes of both spark plugs (one cylinder is on the compression stroke, the other cylinder is on the exhaust stroke). Accordingly, the ignition of the compressed air-fuel mixture occurs only in the cylinder whose piston is at the end of the compression stroke. Similarly, when the primary circuit of ignition coil B is interrupted, high voltage is applied to the electrodes of the spark plugs for cylinders 2 and 3.
The electronic engine control unit sequentially turns on and off the power transistors built into the ignition coils. Thus, high voltage is applied to the spark plugs of the cylinders in the order 1-3-4-2.
The electronic engine control unit, receiving signals from the camshaft position sensor and the crankshaft position sensor, determines which of the power transistors of the ignition coils to apply a control pulse (interrupting the primary circuit of the coil). The electronic unit, receiving a signal from the crankshaft position sensor, determines the angular position of the latter and the optimal ignition timing for a given engine operation mode.
When the engine is cold, or when operating in high altitudes or driving with a cold engine, the ignition timing advances slightly to ensure optimum engine performance. Moreover, when knocking occurs, the ignition timing is gradually reduced until knocking stops.
On the 4G93-GDI engine since 2000, a misfire detection sensor has been added.