Ignition Coil Tests - TOHATSU NB-1000 Service Manual

SECTION 7
Test 6 - Ignition Coil Tests
Make sure all electrical terminals are connected
during this test except those that are noted in the
test procedure.
Check for continuity between chassis ground and
the ground connection for the magneto plate, CD
Unit, and ignition coils before conducting the
following procedure.
The following tests check the resistance of the primary and
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secondary windings in each ignition coil (1).
1. Remove spark plug lead (2).
2. Set digital multimeter to ohms.
3. Disconnect terminals (4) and (5).
4. Connect one tester lead to terminal (3) and the other terminal (4).
5. The meter should indicate the following readings for the primary
winding.
Repeat readings for each ignition coil:
Engine Models
2.5 / 3.5
5
8 / 9.8
9.9 / 15 / 18
25 / 30
40
6. If primary winding for any ignition coil is not within the acceptable
range, replace the ignition coil. See Ignition System Repair
Procedures - Ignition Coil. After repairs are made, return to Ignition
System Performance Testing Flow Chart.
If the primary windings are within the acceptable range, proceed to
the next step.
7. Connect one tester lead to terminal (3) and the other to spark
plug lead (cap) [terminal (2)].
8. The meter should indicate the following readings for the secondary
winding.
7-38
NOTE
Results
0.18 - 0.24 Ω ± 25%
0.2 - 0.38 Ω ± 25%
N/A
0.2 - 0.3 Ω ± 25%
0.2 - 0.3 Ω ± 25%
0.2 - 0.3 Ω ± 25%
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T1485
1-/ 2-Cylinder