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DISASSEMBLY, REASSEMBLY, INSPECTION, AND MAINTENANCE 3-15
Ignition System
Ignition Coil Inspection
Spark Characteristics Measurement
•
Connect the ignition coil to a coil tester to measure its spark
characteristics. Follow the measurement instructions provided by
the tester manufacturer for the proper measurement procedure. (For
testing purposes, remove the plug cap from the ignition coil.)
Ignition Coil Spark Characteristics (three-wire spark gap)
Standard: 7 mm (0.28 in) minimum
If the spark characteristics are below the standard, the ignition coil
is defective. If the spark characteristics are normal, the plug cap is
defective.
Ignition Coil Resistance Measurement
If a coil tester is unavailable, use a hand tester (P/N 57001-1394)
to measure the internal resistance of the coil. Although this test is not
sufficient to determine the integrity of the coil, it will serve as a criterion
for making a judgment.
•
Connect the hand tester as shown in the diagram on the right, set
it to the measurement ranges listed in the table below, and measure
the resistance values. 2 Ignition Coil Internal Resistance (separate
igniter type)
Ignition Coil Internal Resistance (separate igniter type) (
)
Measurement Area Measurement Range Resistance
Primary Coil R 1 0.6 ~ 1.10
Secondary Coil R 1k 6.0 ~ 10.0 k
Ignition Coil Internal Resistance (integrated igniter type) ( )
Measurement Area Measurement Range Resistance
Primary Coil R 1 0.6 ~ 1.4
Secondary Coil R 1k 6.0 ~ 11.0 k
If the measured value is within the range given above or greater, the
coil is normal. If the measured value is lower than the above, the coil
is defective and it must be replaced with a good one.
1. Measurement of Primary Coil Resistance
2. Measurement of Secondary Coil Resistance
3. Ignition Coil