CHECK HARNESS BETWEEN ECM AND IGNITION COIL CONNECTOR.

1) Disconnect the connectors from ECM.

2) Measure the resistance of harness between ECM and ignition coil connector.

Connector & terminal

Euro 4 model

(B134) No. 22 — (E34) No. 1:
(B134) No. 23 — (E33) No. 1:
(B134) No. 24 — (E32) No. 1:
(B134) No. 25 — (E31) No. 1:

Euro 5 model

(B134) No. 11 — (E31) No. 1:
(B134) No. 12 — (E32) No. 1:
(B134) No. 21 — (E33) No. 1:
(B134) No. 22 — (E34) No. 1:

QUESTION

Is the resistance less than 1 Ω?

Yes No

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit of harness between ECM and ignition coil connector

• Poor contact of coupling connector