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Home >> Toyota >> 2022 >> 4Runner TRD Pro >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Transfer Case (VF4BM) - Diagnostic Codes & Circuit Tests) >> Transfer System >> DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0122: Lost Communication With Vehicle Dynamics Control Module [08/2019 - ] >> Description

DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0122: Lost Communication With Vehicle Dynamics Control Module [08/2019 - ]: Description

WARNING: This page is about a different variant/trim than selected.

This DTC is output when communication is lost with the skid control ECU (master cylinder solenoid) or ECM.

DTC No. DTC Detection Condition
  1. Diagnosis Condition
  2. Malfunction Status
  3. Malfunction Time
  4. Other
 Trouble Area
U0100
  1. Ignition switch turned to ON (3 seconds elapse after ignition switch is turned to ON)
  2. Communication is lost between ECM and 4 wheel drive control ECU
  3. 5.12 seconds or more when transfer is switching between high and low
  4. 1 trip detection logic
 CAN communication system
U0122
  1. Ignition switch turned to ON (3 seconds elapse after ignition switch is turned to ON)
  2. Communication is lost between skid control ECU and 4 wheel drive control ECU
  3. 0.72 seconds or more when transfer is switching between high and low, when center differential is switching between free and lock
  4. 1 trip detection logic
 CAN communication system
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