1) Turn the ignition switch to OFF.
2) Remove the ECM.
3) Measure the resistance between ECM connectors.
Connector & terminal
(B137) No. 23 — (B137) No. 25:
(B137) No. 24 — (B137) No. 25:
Is the resistance 1 MΩ or more?
Repair the battery short circuit of harness.