Service manual

11.12 Ignition Coil Failure
No. Operating steps Result Follow up steps
1 Put the ignition switch to “ON”. Next step
Yes Next step 2 Pull out ignition coil joint on harness, and then use
a multimeter to check if the voltage between 3#
pin of this joint and ground wire is an around 12V
battery voltage.
No Check the circuit
Yes Check circuit and
ECU
3 Pull out ignition coil joint on harness, and then use
a multimeter to check if it is short or break circuit
between 1# pin of this joint and 5# pin of ECU.
No Next step
Yes Check circuit and
ECU
4 Pull out ignition coil joint on harness, and then use
a multimeter to check if it is short or break circuit
between 2# pin of this joint and 2# pin of ECU.
No Next step
Yes Next step 5 Check if the resistance of primary coil of the
sensor is around 0.9Ω.
No Replace the ignition
coil
Yes Next step 6 Check if the resistance of secondary coil of the
sensor is around 14.5kΩ.
No Replace the ignition
coil
Yes Check other part 7 Use an oscillometer to check if secondary ignition
waveform of ignition cable of ignition system is
normal.
No Replace the ignition
coil
Note: The ignition coil is mainly used to provide ignition system of engine with ignition energy. The
failure rate of the coil itself is very low, but its failure probability can not be completely excluded. When
failure occurs in ignition coil, the ignition energy of engine will be deficient, which may further lead to
such failures as unsteady idle speed of engine and emission deterioration.