1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance between ECM connectors.
Connector & terminal
(B135) No. 29 — (B135) No. 23:
Is the resistance 1 MΩ or more?
Repair the poor contact of accelerator pedal position sensor connector. Replace the accelerator pedal if defective.
Repair the short circuit to power source in the harness between the ECM and accelerator pedal position sensor connector.