DTC P1499: Coil 4 EGR "A" Control Circuit High: Notes

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

1. -

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Improper idling
Poor driving performance
Engine breathing

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 .

IMPREZA MODEL

G13614764

Courtesy of SUBARU OF AMERICA, INC.

CROSSTREK MODEL

G13614765

Courtesy 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 .

CHECK HARNESS BETWEEN ECM AND EGR CONTROL VALVE (SHORT TO POWER SUPPLY) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Disconnect the connector from the EGR control valve.
4. Turn the ignition switch to ON.
5. Measure the voltage between defective ECM connector and chassis ground.
Connector and terminal

DTC P1493; (E158) No. 98 (+) - Chassis ground (-):

DTC P1495; (E158) No. 97 (+) - Chassis ground (-):

DTC P1497; (E158) No. 107 (+) - Chassis ground (-):

DTC P1499; (E158) No. 106 (+) - Chassis ground (-):

Is the voltage 10 V or more?

Yes: Repair the short circuit to power supply in the harness between the ECM connector and EGR control valve connector.

No: Go to 2.
CHECK EGR CONTROL VALVE .
Check the EGR control valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (EXCEPT FOR HEV))>EGR CONTROL VALVE>INSPECTION .

Is the check result OK?

Yes: Repair the poor contact of ECM connector.

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