YH4
GRAND
VITARA
1. To ignition switch
2. “IG
.
COIL METER” fuse
3. ECM (or PCM)
4. Noise suppressor
5. Ignition coil assembly (igniter and ignition coil) for No.1 and No.4 cylinders
6. Ignition coil assembly (igniter and ignition coil) for No.2 and No.3 cylinders
7. High-tension cord
– Engine start switch
– VSS
10. CMP sensor
11. To main relay
12. Ignition timing adjusting
resistor (if equipped)
8. Spark plug
9. Sensed information
– MAF sensor
– ECT sensor
– IAT sensor
– TP sensor
– CKP sensor (if equipped)
6F1-2 IGNITION SYSTEM (FOR G16 ENGINE)
GENERAL DESCRIPTION
The ignition system is a distributorless ignition system. Its consists of the parts as described below and has an
electronic ignition control system.
ECM (or PCM)
It detects the engine condition through the signals from the sensors, determines the most suitable ignition timing
and time for electricity to flow to the primary coil and sends a signal to the igniter (in ignition coil assembly).
Ignition coil assembly (including an igniter and an ignition coil)
The ignition coil assembly has a built-in igniter and ignition coil which turns ON and OFF the primary current of
the ignition coil according to the signal from ECM (or PCM). When the ignition coil primary current is turned OFF,
a high voltage is induced in the secondary wiring.
Spark plug , high-tension cord and noise suppressor
CMP sensor, TP sensor, ECT sensor, MAF sensor and other sensors/switches.
For their details, refer to SECTION 6E1.
Although this ignition system does not have a distributor, it has two ignition coil assemblies (one is for No.1 and
No.4 spark plugs and the other is for No.2 and No.3 spark plugs). When an ignition signal is sent from ECM (or
PCM) to the igniter in the ignition coil assembly for No.1 and No.4 spark plugs, a high voltage is induced in the
secondary coil. Then, it is fed to No.1 spark plug through high-tension cords and to No.4 spark plug directly from
ignition coil assembly to cause both of these plugs to spark simultaneously. Likewise, when an ignition signal is
sent from ECM (or PCM) to the ignition coil assembly for No.2 and No.3 spark plugs, a high voltage is induced in
the secondary coil. Then, it is fed to No.3 spark plug through high-tension cords and to No.2 spark plug directly
from ignition coil assembly to cause both No.2 and No.3 spark plugs to spark simultaneously.
The ignition system of vehicle with CKP sensor needs no adjustment of initial ignition timing.
SYSTEM WIRING
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