DTC P1498 - EGR Solenoid Valve Signal #4 Circuit Malfunction (Low Input) -

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:
- Detected simultaneously at occurrence of malfunction.
TROUBLE SYMPTOM:
- Erroneous idling
- Engine stalls.
- Engine breathing
CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >
WIRING DIAGRAM:

Fig 1: EGR Solenoid Valve Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK POWER SUPPLY TO EGR SOLENOID VALVE. Turn ignition switch to OFF. Disconnect connector from EGR solenoid valve. Turn ignition switch to ON. Measure voltage between EGR solenoid valve connector and engine ground. Connector & terminal (E18) No. 2 (+) - Engine ground (-): (E18) No. 5 (+) - Engine ground (-):	Is the measured value more than 10 V?	Go to step 2.	Repair harness and connector. NOTE: In this case, repair the following: Open circuit in harness between EGR solenoid valve and main relay connector Poor contact in coupling connector
2 CHECK HARNESS BETWEEN ECM AND EGR SOLENOID VALVE CONNECTOR. Turn ignition switch to OFF. Measure resistance between ECM and EGR solenoid valve connector. Connector & terminal DTC P1492; (B134) No. 18 - (E18) No. 6: DTC P1494; (B134) No. 17- (E18) No. 1: DTC P1496; (B134) No. 16 - (E18) No. 4: DTC P1498; (B134) No. 15 - (E18) No. 3:	Is the measured value less than 1 Ω?	Go to step 3.	Repair harness and connector. NOTE: In this case, repair the following: Open circuit in harness between ECM and EGR solenoid valve connector Poor contact in coupling connector
3 CHECK HARNESS BETWEEN ECM AND EGR SOLENOID VALVE CONNECTOR. Disconnect connector from ECM. Measure resistance between ECM connector and chassis ground. Connector & terminal DTC P1492; (B134) No. 18 - Chassis ground: DTC P1494; (B134) No. 17 - Chassis ground: DTC P1496; (B134) No. 16 - Chassis ground: DTC P1498; (B134) No. 15 - Chassis ground:	Is the measured value more than 1 MΩ?	Go to step 4.	Repair ground short circuit between ECM and EGR solenoid valve connector.
4 CHECK POOR CONTACT. Check poor contact between ECM connector and EGR solenoid valve connector.	Is there poor contact of ECM connector or EGR solenoid valve connector?	Repair poor contact of ECM connector or EGR solenoid valve connector.	Replace EGR solenoid valve. < Ref. to EGR VALVE . >