Measure the resistance of harness between ECM and delivery (test) mode connector.
Connector & terminal
(B135) No. 22 — (B75) No. 1:
Is the resistance less than 1 Ω?
Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit of harness between ECM and delivery (test) mode connector
• Poor contact of test mode sub connector