CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Measure the voltage between ECM and chassis ground.

Connector & terminal

Euro 4 model

(B134) No. 1 (+) — Chassis ground (−):
(B134) No. 2 (+) — Chassis ground (−):
(B134) No. 9 (+) — Chassis ground (−):
(B134) No. 10 (+) — Chassis ground (−):

Euro 5 model

(B134) No. 1 (+) — Chassis ground (−):
(B134) No. 2 (+) — Chassis ground (−):

QUESTION
Is the voltage 10 V or more?
Yes	No
Repair the short circuit to power in the harness between ECM and front oxygen (A/F) sensor connector.