Corolla CE Sedan L4-1794cc 1.8L DOHC MFI (2001)
Spark Plug: Testing and Inspection
ON-VEHICLE INSPECTION
NOTE: "Cold" and "Hot" in these sentences express the temperature of the coils themselves. "Cold" is from -10 °C (14 °F) to 50 °C (122 °F) and
"Hot" is from 50 °C (122 °F) to 100 °C (212 °F).
INSPECT SPARK PLUGS
NOTE:
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Never use a wire brush for cleaning.
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Never attempt to adjust the electrode gap on used spark plug.
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Spark plug should be replaced every 192,000 km (12,000 miles).
a. Remove the ignition coils.
b. Check the electrode.
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Using a megger (insulation resistance meter), measure the insulation resistance.
Correct insulation resistance: 10 Mohm or more
If the resistance is less than specified, proceed to step (d).
HINT: If a megger is not available, the following simple method of inspection provides fairly accurate results.
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Simple method:
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Quickly race the engine to 4,000 rpm 5 times.
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Remove the spark plug. (See step (c))
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Visually check the spark plug.
If the electrode is ..... Okay.
If the electrode is wet... Proceed to step (d).
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Reinstall the spark plug. (See step (g))
