IGNITION CONTROL SYSTEM

/ 9-2X (9346) / 2005 / 2. Engine / ENGINE (DIAGNOSTICS), 2.0T / Diagnostics for Engine Starting Failure / Fault diagnosis, general / IGNITION CONTROL SYSTEM

Important
After repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

CHECK SPARK PLUG CONDITION.

Remove the spark plug.

Check the spark plug condition.

Is the spark plug’s status OK?

Yes

Replace the spark plug.

CHECK IGNITION SYSTEM FOR SPARKS.

Connect the spark plug to ignition coil.

Release the fuel pressure.

Contact the spark plug’s thread portion on engine.

While opening the throttle valve fully, crank engine to check that spark occurs at each cylinder.

Does spark occur at each cylinder?

Yes

Check the fuel pump system.

CHECK POWER SUPPLY CIRCUIT FOR IGNITION COIL AND IGNITOR ASSEMBLY.

Turn the ignition switch to OFF.

Disconnect the connector from ignition coil and ignitor assembly.

Turn the ignition switch to ON.

Measure the power supply voltage between ignition coil and ignitor assembly 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 (−):

Is the voltage more than 10 V?

Yes

•

Repair the harness and connector.

•

Note
In this case, repair the following:
•	Open circuit in harness between ignition coil and ignitor assembly, and ignition switch connector
•	Poor contact in coupling connectors

CHECK HARNESS OF IGNITION COIL AND IGNITOR ASSEMBLY GROUND CIRCUIT.

Turn the ignition switch to OFF.

Measure the resistance between ignition coil and ignitor assembly 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:

Is the resistance less than 5 Ω?

Yes

•

Repair the harness and connector.

•

Note
In this case, repair the following:
•	Open circuit in harness between ignition coil and ignitor assembly connector and engine grounding terminal

CHECK HARNESS BETWEEN ECM AND IGNITION COIL AND IGNITOR ASSEMBLY CONNECTOR.

Turn the ignition switch to OFF.

Disconnect the connector from ECM.

Disconnect the connector from ignition coil and ignitor assembly.

Measure the resistance of harness between ECM and ignition coil and ignitor assembly connector.

Connector & terminal

(B137) No. 21 — (E34) No. 1:

(B137) No. 22 — (E33) No. 1:

(B137) No. 23 — (E32) No. 1:

(B137) No. 24 — (E31) No. 1:

Is the resistance less than 1 Ω?

Yes

•

Repair the harness and connector.

•

Note
In this case, repair the following:
•	Open circuit in harness between ECM and ignition coil and ignitor assembly connector
•	Poor contact in coupling connector

CHECK HARNESS BETWEEN ECM AND IGNITION COIL AND IGNITOR ASSEMBLY CONNECTOR.

Measure the resistance of harness between ECM and engine ground.

Connector & terminal:

(B137) No. 21 — Engine ground:

(B137) No. 22 — Engine ground:

(B137) No. 23 — Engine ground:

(B137) No. 24 — Engine ground:

Is the resistance more than 1 MΩ?

Yes

Repair the ground short circuit in harness between ECM and ignition coil and ignitor assembly connector.

CHECK POOR CONTACT.

Check poor contact in ECM connector.

Is there poor contact in ECM connector?

Yes

Repair the poor contact in ECM connector.

Replace the ignition coil and ignitor assembly.

IGNITION CONTROL SYSTEM

CHECK SPARK PLUG CONDITION.

Is the spark plug’s status OK?

CHECK IGNITION SYSTEM FOR SPARKS.

Does spark occur at each cylinder?

CHECK POWER SUPPLY CIRCUIT FOR IGNITION COIL AND IGNITOR ASSEMBLY.

Is the voltage more than 10 V?

CHECK HARNESS OF IGNITION COIL AND IGNITOR ASSEMBLY GROUND CIRCUIT.

Is the resistance less than 5 Ω?

CHECK HARNESS BETWEEN ECM AND IGNITION COIL AND IGNITOR ASSEMBLY CONNECTOR.

Is the resistance less than 1 Ω?

CHECK HARNESS BETWEEN ECM AND IGNITION COIL AND IGNITOR ASSEMBLY CONNECTOR.

Is the resistance more than 1 MΩ?

CHECK POOR CONTACT.

Is there poor contact in ECM connector?

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