3-2 ENGINE CONTROL
CKP (Crankshaft position) SENSOR
Function
There are two (2) CKP sensor installed below the flywheel rotor.
When the reluctor bar on the flywheel passes the sensors, a
signal (voltage pulse ) is generated and sent to CDI unit.
This is the fundamental signal used to judge the engine speed
and crankshaft angle.
CKP sensor sends basic signal for determining ignition timing to
CDI unit.
Failure symptoms
When No.1 CKP sensor is NG:
• Spark on No.2 and No.3 cylinders only.
• Ignition timing fixed at BTDC5°
When No.2 CKP sensor is NG:
• Spark on No.1cylinder only. (Less than 1000 r/min)
• Spark on No.1 and No.2 cylinders only. (1000 r/min or over)
• Ignition timing fixed at BTDC5°
POWER SOURCE COIL
Function
This coil provides the power source for the engine control sys-
tem.
Failure symptoms
The ignition and caution systems will not function.
IGNITION SYSTEM
SYSTEM COMPONENTS
Ignition system consists of power source coil, CKP sensor, CDI
unit, ignition coil and engine stop switch.
FUNCTION AND FAILURE SYMPTOMS
IGNITION COIL
Function
There is an independent coil for each cylinder.
Voltage from the CDI unit is greatly increased to produce the
power needed for a spark at the plug.
Failure symptoms
A failed coil will produce no spark at that particular cylinder.
Starting will be difficult and idling / acceleration will be poor.
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