TOHATSU 40 Service Manual page 223

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 cap (2).
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2. Set digital multimeter to ohms.
3. Disconnect terminals (4) and (5).
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4. Connect one tester lead to terminal (3) and the other
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terminal (4).
5. The meter should indicate the following readings for the primary
winding.
Repeat readings for each ignition coil:
Engine Models
40 and 50
60B / 70B / 60C / 70C
80 and 90
115 / 120 / 140
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
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spark plug cap [terminal (2)].
8. The meter should indicate the following readings for the
secondary winding.
Repeat readings for each ignition coil:
Engine Models
40 and 50, 60 / 70C
60B / 70B
80 / 90
115 / 120 / 140
7-44
NOTE
Results
0.18 - 0.24 Ω ± 25%
0.18 - 0.24 Ω ± 25%
0.19 - 0.25 Ω ± 25%
0.18 - 0.24 Ω ± 25%
Results
2.7 - 3.7 K Ω ± 25%
2.7 - 3.7 K Ω ± 25%
3.6 - 4.8 K Ω ± 25%
2.7 - 3.7 K Ω ± 25%
T1485
3-/ 4-Cylinder