CHECK HARNESS BETWEEN ECM AND EGR VALVE CONNECTOR.

1) Disconnect the connectors from ECM.

2) Measure the resistance between ECM and chassis ground.

Connector & terminal

Euro 4 model

DTC P1492; (B134) No. 15 — Chassis ground:
DTC P1494; (B134) No. 12 — Chassis ground:
DTC P1496; (B134) No. 14 — Chassis ground:
DTC P1498; (B134) No. 13 — Chassis ground:

Euro 5 model

DTC P1492; (B134) No. 23 — Chassis ground:
DTC P1494; (B134) No. 14 — Chassis ground:
DTC P1496; (B134) No. 24 — Chassis ground:
DTC P1498; (B134) No. 13 — Chassis ground:

QUESTION

Is the resistance 1 MΩ or more?

Yes No

Repair the ground short in harness between ECM and EGR valve connector.