Checking Ignition Coil
●Check the primary coil
●
Measure the impedance among the terminals of
primary coil.
Standard value: (0.58±10%)Ω
20
Coil resistance: Primary 0.58±10%Ω(20
),
Secondary 8±10%KΩ (20
)
High-
pressure cap, internal resistance of
5±10%KΩ
★The impedance value is good in the standard value.
★If the impedance value is “∞”, it indicates that the
wire in the coil is disconnected and the ignition coil
needs to be replaced.
• If the spark plug does not generate sparks, check
whether the wiring parts are loose or whether their
contact is poor,
• Because there are many brands of multimeter and
their internal impedances are different, the test
values are different.
Installing ignition coil
●Install the ignition coil in the reverse orde
disassembly
Spark Plug
Checking Spark Plug
●
Disassemble the spark plug (see the spark plug
disassembly section)
●Visually check the spark plug
○If the central electrode [A] and/or side electrode [A]
of spark plug is/are corroded or damaged, or the
insulation terminal [C] is broken, replace the spark plug
★If the spark plug is dirty or there are carbon deposits
on the spark plug, replace the spark plug
○Measure the clearance [D] with a linear feeler gauge
○If the clearance is incorrect, replace the spark plug
Clearance of spark plug: 0.6-0.7 mm
○Use the standard spark plugs or spark plugs in the
same grade
Spark plug: A7RC (BOSCH)
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