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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.
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