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

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Improper idling
Poor driving performance
Engine breathing

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Clear Memory Mode . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Inspection Mode .
Use the check board when measuring the ECM terminal voltage and resistance.

Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

Fig 1: Coil 4 EGR A Control Circuit High - Wiring Diagram

G11270696

Courtesy of SUBARU OF AMERICA, INC.

CHECK HARNESS BETWEEN ECM AND EGR CONTROL VALVE CONNECTOR.
1. Turn the ignition switch to OFF.
2. Disconnect the connector from the EGR control valve.
3. Disconnect the connector from ECM.
4. Turn the ignition switch to ON.
5. Measure the voltage between ECM and engine ground.
  Connector & terminal
  
  DTC P1493; (E159) No. 5 (+) - Engine ground (-):
  
  DTC P1495; (E159) No. 21 (+) - Engine ground (-):
  
  DTC P1497; (E159) No. 13 (+) - Engine ground (-):
  
  DTC P1499; (E159) No. 29 (+) - Engine ground (-):
  
  Is the voltage 10 V or more?
  - Yes : Repair the short circuit to power in the harness between the ECM and EGR control valve connector.
  - No : Go to 2.
CHECK EGR CONTROL VALVE.
Measure the resistance between EGR control valve terminals.

Terminals

DTC P1493; No. 2 - No. 3:

DTC P1495; No. 2 - No. 1:

DTC P1497; No. 5 - No. 4:

DTC P1499; No. 5 - No. 6:

Is the resistance 20 Ω or more?
- Yes : Repair the poor contact of ECM connector.
- No : Replace EGR control valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>EGR Control Valve .