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DTC P1498 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT)

DTC P1498 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT)

DTC DETECTING CONDITION:


• Immediately at fault recognition.

• GENERAL DESCRIPTION , , and


TROUBLE SYMPTOM:


• Erroneous idling

• Poor driving performance

• Engine breathing


Important

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


WIRING DIAGRAM:


CHECK POWER SUPPLY TO EGR SOLENOID VALVE.

Turn ignition switch to OFF.

Disconnect connector from EGR solenoid valve.

Turn ignition switch to ON.

Measure the power supply voltage between EGR solenoid valve and engine ground.

Connector & terminal

(E18) No. 2 (+) — Engine ground (−):

(E18) No. 5 (+) — Engine ground (−):

Is the measured value more than 10 V?

Yes


No

• Repair harness and connector.

Note

In this case, repair the following:

• Open circuit in harness between EGR solenoid valve connector and main relay connector

• Poor contact in coupling connector



CHECK HARNESS BETWEEN ECM AND EGR SOLENOID VALVE.

Turn ignition switch to OFF.

Measure resistance between ECM and EGR solenoid valve connector.

Connector & terminal

DTC P1492; (B134) No. 9 — (E18) No. 4:

DTC P1494; (B134) No. 10 — (E18) No. 1:

DTC P1496; (B134) No. 11 — (E18) No. 3:

DTC P1498; (B134) No. 8 — (E18) No. 6:

Is the measured value less than 1 Ω?

Yes


No

• Repair harness and connector.

Note

In this case, repair the following:

• Open circuit in harness between EGR solenoid valve connector and main relay connector

• Poor contact in coupling connector



CHECK HARNESS BETWEEN ECM AND EGR SOLENOID VALVE.

Disconnect connector from ECM.

Measure resistance between ECM connector and chassis ground.

Connector & terminal

DTC P1492; (B134) No. 9 — (E18) No. 4:

DTC P1494; (B134) No. 10 — (E18) No. 6:

DTC P1496; (B134) No. 11 — (E18) No. 3:

DTC P1498; (B134) No. 8 — (E18) No. 1:

Is the measured value more than 1 MΩ?

Yes


No

Repair open or ground short circuit in harness between ECM and EGR solenoid valve connector.


CHECK POOR CONTACT.

Check poor contact in ECM and EGR solenoid valve connector.

Is there poor contact in ECM or EGR solenoid valve connector?

Yes

Repair poor contact in ECM or EGR solenoid valve connector.


No

Replace EGR solenoid valve.