ADAPTIVE VARIABLE SUSPENSION SYSTEM, Diagnostic DTC:C1786

DTC Code DTC Name
C1786 Master Cylinder Pressure Circuit

DESCRIPTION

This DTC is output when a malfunction signal from the pressure sensor system built into the brake actuator of the brake booster with master cylinder assembly is received by the absorber control ECU via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
C1786 Master Cylinder Pressure Circuit A pressure sensor system malfunction signal is continuously received from the skid control ECU (brake booster with master cylinder assembly) for 3 seconds or more.

  • CAN communication system

  • Skid control ECU (brake booster with master cylinder assembly)

  • Absorber control ECU

 Does not come on

CAUTION / NOTICE / HINT

Note


  • Before performing troubleshooting, inspect the connectors of related circuits.

  • If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first.

    Click here

  • Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation; 2) DTC inspection; and 3) GTS inspection (ECU Data List or Active Test Click here). If no malfunctions are found in other areas, replace the absorber control ECU.

  • When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met.

    Click here

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs.

      Click here


      Chassis > Air suspension > Trouble Codes
      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output B

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  2. CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Check for pressure sensor malfunction DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    A

    REPLACE ABSORBER CONTROL ECU Click here

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here