Suzuki DF 30 - Testing Ignition System; Ignition Troubleshooting

3-6 ENGINE CONTROL
TESTING IGNITION SYSTEM
IGNITION TROUBLESHOOTING
Perform the following ignition system tests when engine is hard to start to determine if the cause is in the
ignition or another system.
START
Check spark condition.
Check if the spark plug is in good condi-
tion. (See page 2-8)
No or weak sparks
Replace the spark plug with new one.
Not good
Disconnect the engine stop switch wire
(Green or Blue / Red).
Check and/or replace
• the engine stop switch. (See page 3-11)
• ignition switch. (See page 4-10)
Sparks
Check the ignition coil resistance.
(See page 3-7)
[Primary: 0.17 – 0.23 Ω,
Secondary: 3.3 – 5.0 kΩ]
Replace the ignition coil.
Out of spec.
Check spark plug cap for any evidence of
high-tension leak.
Replace the spark plug cap.
Not good
OK
No or weak sparks
OK
OK
Check the spark plug cap resistance.
(See page 3-8)
[Cap resistance: 4 – 6 kΩ]
Replace the spark plug cap.
Out of spec.
OK
Check the Power source coil resistance.
(See page 3-8)
[Coil resistance: 10.1 – 15.1 Ω]
Replace the coil.
Out of spec.
OK
Check the CKP sensor resistance.
(See page 3-9)
[Sensor resistance: 148 – 222 Ω]
Replace the CKP sensor(s).
Out of spec.
OK
Replace CDI unit.
Sparks
Check ignition timing by using tim-
ing light.
The cause will not be in ignition system.
Not good
OK