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Home >> Toyota >> 2021 >> Mirai Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System - Diagnostic Codes (18 Of 18) & Circuit Tests (1 Of 3) >> Hybrid Control System >> DTC U0129-87: Lost Communication With Brake System Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U0164-87: Lost Communication with HVAC Control Module Missing Message; DTC U1107-87: Lost Communication with Power Management Module Missing Message; DTC U1170-87: Lost Communication with Brake System Control Module (Secondary CAN Line) Missing Message; DTC U1176-87: Lost Communication with Gear Shift Control Module "A" (Powertrain Bus) Missing Message; DTC U117B-87: Lost Communication with Hybrid/EV Battery Energy Control Module "A" (ch2) Missing Message [12/2023 - ] >> Caution / Notice / Hint

Caution / Notice / Hint

NOTE:
  • This vehicle performs FC system shutdown process after turning the ignition switch off from ON (READY). Therefore, after the ignition switch is turned off from ON (READY), do not perform any work on the electrical system for at least 10 minutes including removing connectors or disconnecting the negative (-) auxiliary battery terminal.
  • When the EV control ECU determines that the temperature of FC system components is below 0°C (32°F) when the vehicle is parked with the ignition switch off, it operates the FC air compressor, hydrogen pump and FC cooling water pump for a maximum of 180 seconds to drain the FC stack assembly. When performing inspection or repairs with the ignition switch off (not ON or ON (READY)), disconnect the cable from the negative (-) auxiliary battery terminal before performing work. (If the auxiliary battery voltage is needed to conduct inspection, perform the inspection in an environment with an ambient temperature of 10°C (50°F) or higher.)
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