DTC P1498 EGR Solenoid Valve Signal #4 Circuit Malfunction (Low Input): Wiring Diagram

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: EGR Solenoid Valve Signal #4 Circuit Malfunction - Wiring Diagram (Low Input)

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE

Step	Check	Yes	No
1 CHECK POWER SUPPLY TO EGR CONTROL VALVE. Turn the ignition switch to OFF. Disconnect the connector from the EGR control valve. Turn the ignition switch to ON. Measure the voltage between EGR control valve connector and engine ground. Connector & terminal (E18) No. 2 (+) - Engine ground (-): (E18) No. 5 (+) - Engine ground (-):	Is the voltage 10 V or more?	Go to step 2.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between EGR control valve and main relay connector Poor contact of coupling connector
2 CHECK HARNESS BETWEEN ECM AND EGR CONTROL VALVE CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance between ECM and EGR control valve connector. Connector & terminal DTC P1492; (B134) No. 8 - (E18) No. 3: DTC P1494; (B134) No. 9 - (E18) No. 1: DTC P1496; (B134) No. 20 - (E18) No. 4: DTC P1498; (B134) No. 30 - (E18) No. 6:	Is the resistance less than 1 Ω?	Go to step 3.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and EGR control valve connector Poor contact of coupling connector
3 CHECK HARNESS BETWEEN ECM AND EGR CONTROL VALVE CONNECTOR. Disconnect the connector from ECM. Measure the resistance between ECM and chassis ground. Connector & terminal DTC P1492; (B134) No. 8 - Chassis ground: DTC P1494; (B134) No. 9 - Chassis ground: DTC P1496; (B134) No. 20 - Chassis ground: DTC P1498; (B134) No. 30 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 4.	Repair the ground short in harness between ECM and EGR control valve connector.
4 CHECK FOR POOR CONTACT. Check poor contact between ECM and EGR control valve connector.	Is there poor contact in ECM or EGR control valve connector?	Repair the poor contact of ECM or EGR control valve connector.	Replace EGR control valve. < refer to EGR CONTROL VALVE . >