Suzuki DF150 Service Manual page 115

3-56 ENGINE CONTROL SYSTEM
IGNITION COIL ASSEMBLY
! 09930-99320: Digital tester
$ Tester range: % DCV (See chart for range.)
NOTE:
The ignition coil power transistor and high-tension lead are an
integral part of the coil' internal circuit. Using resistance mea-
surements to check for a defect on either the primary or second-
ary coil is not possible.
1. Turn ignition key OFF.
2. Disconnect ignition coil connector.
3. Check for continuity between GND - terminal on the wiring
harness side connector and the engine body ground.
4. Turn the ignition key to ON position. Check for battery volt-
age by measureing between the BAT + terminal and GND
terminal on the wiring harness side connector.
5. Connect the wiring harness connector to the ignition coil and
measure the ignition operating signal. (See page 3-55.)
6. If any failure exists, check for open circuit, short-circuited
battery, short-circuited lead and connector's contact condi-
tion for each circuit.
7. If there is no spark even with the wiring harness and spark
plug in sound condition, perform inspection again using an
ignition coil that is known to be in good condition (new or
used from another cylinder that is operating properly).
8. If there is still no spark even with the wiring harness, spark
plug and ignition coil in sound condition, replace the ECM
and perform inspection again.
GND
IGT
+BAT