1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance between connector terminals.
Connector & terminal
(B134) No. 28 — (B134) No. 19:
Is the resistance 1 MΩ or more?
Repair the poor contact of harness. Replace the electronic throttle if defective.
Repair the short to power supply in harness between ECM and electronic throttle connector.