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Home >> Lexus >> 2017 >> RX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Dynamic Torque Control AWD System - Diagnostic Codes & Circuit Tests) >> Dynamic Torque Control AWD System >> DTC C120C: Linear Solenoid Power Supply System Malfunction [08/2019 - ] >> Description

DTC C120C: Linear Solenoid Power Supply System Malfunction [08/2019 - ]: Description

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This DTC is output by the 4WD ECU assembly if a malfunction occurs in the linear solenoid power supply system.

DTC No. Detection Item DTC Detection Condition Trouble Area
C120C Linear Solenoid Power Supply System Malfunction
  1. When the 4WD relay is operating, the 4WD relay monitor remains off for 1 second or more while the voltage at the IG 1 terminal is 9.5 V or more
  2. When the 4WD relay is operating, the 4WD relay monitor remains off for 1 second or more while the voltage at the IG 1 terminal is less than 9.5 V
  3. While the 4WD relay is not operating, the 4WD relay monitor remains on for 1 second or more after the engine switch is turned on (IG)
  • Wire harness and connector (IG 1 circuit, GND circuit)
  • 4WD ECU assembly