1.CHECK SPARK PLUG CONDITION.
1) Remove the spark plug. 
2) Check the spark plug condition.
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Is the spark plug condition normal?
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Replace the spark plug.
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2.CHECK IGNITION SYSTEM FOR SPARKS.
1) Connect the spark plug to ignition coil.
2) Release the fuel pressure.
3) Contact the spark plug thread portion to engine.
4) While opening the throttle valve fully, crank the engine to check that spark occurs at each cylinder.
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Does spark occur at each cylinder?
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Check fuel pump system.
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3.CHECK IGNITION COIL POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ignition coil.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage between ignition coil connector and engine ground.
Connector & terminal
(E31) No. 3 (+) — Engine ground (−):
(E32) No. 3 (+) — Engine ground (−):
(E33) No. 3 (+) — Engine ground (−):
(E34) No. 3 (+) — Engine ground (−):
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Is the voltage 10 V or more?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit or short circuit to ground in harness of power supply circuit
• Poor contact of coupling connector
• Blown out of fuse
(SBF-7)
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4.CHECK HARNESS OF IGNITION COIL GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between ignition coil connector and engine ground.
Connector & terminal
(E31) No. 2 — Engine ground:
(E32) No. 2 — Engine ground:
(E33) No. 2 — Engine ground:
(E34) No. 2 — Engine ground:
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Is the resistance less than 5 Ω?
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Repair the open circuit in harness between ignition coil connector and engine ground.
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5.CHECK HARNESS BETWEEN ECM AND IGNITION COIL CONNECTOR.
1) Disconnect the connectors from ECM.
2) Measure the resistance of harness between ECM and ignition coil connector.
Connector & terminal
Euro 4 model
(B134) No. 22 — (E34) No. 1:
(B134) No. 23 — (E33) No. 1:
(B134) No. 24 — (E32) No. 1:
(B134) No. 25 — (E31) No. 1:
Euro 5 model
(B134) No. 11 — (E31) No. 1:
(B134) No. 12 — (E32) No. 1:
(B134) No. 21 — (E33) No. 1:
(B134) No. 22 — (E34) No. 1:
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Is the resistance less than 1 Ω?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit of harness between ECM and ignition coil connector
• Poor contact of coupling connector
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6.CHECK HARNESS BETWEEN ECM AND IGNITION COIL CONNECTOR.
Measure the resistance of harness between ECM and engine ground.
Connector & terminal
Euro 4 model
(B134) No. 22 — Engine ground:
(B134) No. 23 — Engine ground:
(B134) No. 24 — Engine ground:
(B134) No. 25 — Engine ground:
Euro 5 model
(B134) No. 11 — Engine ground:
(B134) No. 12 — Engine ground:
(B134) No. 21 — Engine ground:
(B134) No. 22 — Engine ground:
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Is the resistance 1 MΩ or more?
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Repair the ground short circuit of harness between ECM and ignition coil connector.
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7.CHECK FOR POOR CONTACT.
Check for poor contact of ECM connector.
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Is there poor contact of ECM connector?
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Repair the poor contact of ECM connector.
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Replace the ignition coil.
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