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Home >> Lexus >> 2009 >> RX 350 FWD >> Repair and Diagnosis >> Suspension >> Rear Suspension >> Air Suspension System (Diagnostic Codes & Circuit Tests) >> Air Suspension System >> DTC C1776/76: Speed Sensor Circuit; DTC C1784/84: Right Rear Speed Sensor Circuit; DTC C1785/85: Left Rear Speed Sensor Circuit >> Description

DTC C1776/76: Speed Sensor Circuit; DTC C1784/84: Right Rear Speed Sensor Circuit; DTC C1785/85: Left Rear Speed Sensor Circuit: Description

The speed sensor monitors the speed of a wheel, and sends an appropriate speed signal to the suspension control ECU through the brake actuator assembly (skid control ECU).

If trouble occurs in the either right rear speed sensor or left rear speed sensor, the DTC (C1776/76) is output. When inspecting by test mode, the suspension control ECU scans changes of the signals. If there is no change, it outputs the test DTC (C1784/84, C1785/85).

DTC No. DTC Detecting Condition Trouble Area
C1776/76 Speed sensor circuit malfunction.
  • Speed sensor
  • Speed sensor circuit
  • Brake actuator assembly (Skid control ECU)
  • Suspension control ECU

HINT: 

When DTC C1784/84 and C1785/85 are output, follow the same procedure as DTC C1776/76.