CHECK GROUND CIRCUIT FOR ECM.

1) Disconnect the connectors from ECM.

2) Measure the resistance of harness between ECM and chassis ground.

Connector & terminal

Euro 4 model

(B134) No. 3 — Chassis ground:
(B134) No. 4 — Chassis ground:
(B134) No. 5 — Chassis ground:
(B134) No. 6 — Chassis ground:
(B134) No. 7 — Chassis ground:
(B135) No. 3 — Chassis ground:
(B135) No. 4 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 6 — Chassis ground:
(B137) No. 7 — Chassis ground:

Euro 5 model

(B134) No. 3 — Chassis ground:
(B134) No. 4 — Chassis ground:
(B135) No. 3 — Chassis ground:
(B135) No. 4 — Chassis ground:
(B135) No. 5 — Chassis ground:
(B135) No. 7 — Chassis ground:
(B136) No. 6 — Chassis ground:
(B137) No. 6 — Chassis ground:
(B137) No. 7 — Chassis ground:

QUESTION

Is the resistance less than 5 Ω?

Yes No

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit in harness between ECM and engine ground terminal

• Poor contact of coupling connector