If "186" refers to a , it is often linked to transmission issues or communication errors between the ECU and the Transmission Control Module (TCM), such as an idle torque limit error.
Detailed voltage specifications for 1999–2004 Toyota Echo models with 1.3L engines. 2nz fe ecu pinout pdf 186 portable
: Transmission Switch D Position (Battery voltage in D; 0V otherwise). If "186" refers to a , it is