ENGINE ELECTRICAL ± Ignition System
16-29
ON-VEHICLE SERVICE
IGNITION COIL (WITH BUILT-IN POWER
TRANSISTOR) CHECK
Check by the following procedure, and replace if there is a
malfunction.
PRIMARY COIL AND POWER TRANSISTOR
CONTINUITY CHECK
NOTE
1. An analogue-type circuit tester should be used.
2. Connect the negative (±) prove of the circuit tester to
terminal 1.
Caution
This test must be performed quickly (in less than 10
seconds) to prevent coil from burning and power transistor
from breakage.
Voltage: 1.5V
Terminal No.
1 2 3
When current is
flowing
When current is
not flowing
SECONDARY COIL CHECK
NOTE
It is impossible to check the secondary coil through the
continuity check as a diode is integrated in the secondary
coil circuit of this ignition coil. So, check the secondary coil
in the following procedure.
1. Disconnect the ignition coil connector.
2. Remove the ignition coil and install a new spark plug to
the ignition coil.
3. Connect the ignition coil connector.
4. Earth the side electrode of the spark plug and crank the
engine.
5. Check that spark is produced between the electrodes of the
spark plug.
6. If no spark is produced, replace the ignition coil with a
new one and recheck.
7. If spark is produced with the new ignition coil, replace
the old one as it is faulty. If no spark is produced again,
the ignition circuit is suspected as faulty. Check the ignition
circuit.
+
1.5 V
+
±
±
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