G643(E) Service Manual Chapter 4. Engine Electrical System 120
Inspection of Ignition Coil
1. Connect ohmmeter between "B+" or "C-"
terminals and ground (coil-mounting bracket). On
high scale, reading should be infinite (test 1,
IAGS004S).
2. Connect ohmmeter between "B+" and "C-
"terminals. On low scale, reading should be nearly
zero (approximately 0.4 ohm) (test 2, IAGS004S).
3. Connect ohmmeter between "B+" or "C-"
terminals and coil high-voltage tower. On high
scale, reading should be approximately 8000
ohms. Reading should not be infinite(test 3,
IAGS004S).
NOTICE
On tests 2 and 3, reading may vary slightly
depending on coil temperature.
4. If reading is not within specification, replace coil.
Disassembly and Assembly
Ignition Coil
Remove & Install Coil
1. Disconnect wire connectors (1) from the coil.
2. Remove two bolts from coil mounting bracket and
remove the coil.
NOTE: For installation of the coil, reverse the
removal steps.
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