Yaris L4-1.5L (1NZ-FE) (2007)
Spark Plug: Testing and Inspection
ON-VEHICLE INSPECTION
HINT: In this section, the terms Cold and Hot refer to the temperature of the coils. Cold means approximately -10 to 50 °C (14 to 122°F). Hot means
approximately 50 to 100 °C (122 to 212 °F).
INSPECT SPARK PLUG
NOTE: Do not use a wire brush for cleaning.
a. Check the electrode.
1. Using a megaohmmeter, measure the insulation resistance.
Standard resistance: 10 mohms or more
HINT:
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If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.
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If a megaohmmeter is not available, perform the following simple inspection instead.
b. Alternative inspection method:
1. Quickly accelerate the engine to 4,000 rpm 5 times
2. Remove the spark plug.
3. Visually check the spark plug.
If the electrode is dry, the spark plug is functioning properly. If the electrode is damp, proceed to the next step.
c. Check the spark plug for any damage to its thread and insulator.
If there is damage, replace the spark plug.