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DTC P1498: Coil 4 EGR "A" Control Circuit Low: Notes

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

1. - 

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM (IMPREZA MODEL)>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

G13614764Courtesy of SUBARU OF AMERICA, INC.
G13614765Courtesy of SUBARU OF AMERICA, INC.
CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .
NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
  1. CHECK POWER SUPPLY TO EGR CONTROL VALVE  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the EGR control valve.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between EGR control valve connector and engine ground.

    Connector and terminal 

    (E18) No. 2 (+) - Engine ground (-):

    (E18) No. 5 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  2.

    No:  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
    • Poor contact of J/C
  2. CHECK HARNESS BETWEEN ECM AND EGR CONTROL VALVE (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance between ECM connector and EGR control valve connector.

    Connector and terminal 

    DTC P1492; (E158) No. 98 - (E18) No. 3:

    DTC P1494; (E158) No. 97 - (E18) No. 1:

    DTC P1496; (E158) No. 107 - (E18) No. 4:

    DTC P1498; (E158) No. 106 - (E18) No. 6:

    Is the resistance less than 1 Ω?

    Yes:  Go to  3.

    No:  Repair the open circuit of the harness between the ECM connector and EGR control valve connector.

  3. CHECK HARNESS BETWEEN ECM AND EGR CONTROL VALVE (SHORT TO GROUND)  .
    1. Disconnect the connector from ECM.
    2. Measure the resistance between ECM connector and chassis ground.

    Connector and terminal 

    DTC P1492; (E158) No. 98 - Chassis ground:

    DTC P1494; (E158) No. 97 - Chassis ground:

    DTC P1496; (E158) No. 107 - Chassis ground:

    DTC P1498; (E158) No. 106 - Chassis ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  4.

    No:  Repair ground short circuit of harness between ECM connector and EGR control valve connector.

  4. CHECK FOR POOR CONTACT  .

    Check for poor contact between ECM connector and EGR control valve connector.

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

    Yes:  Repair the poor contact of ECM or EGR control valve connector.

    No:  Replace EGR control valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (EXCEPT FOR HEV))>EGR CONTROL VALVE .

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