DIAGNOSIS SYSTEM DESCRIPTION When troubleshooting a vehicle with a diagnosis system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the skid control ECU (brake booster with master cylinder assembly). The skid control ECU (brake booster with master cylinder assembly) records DTCs when it detects a malfunction in itself or in its circuits. To check for DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream can be used to clear the DTCs, activate various actuators, and check the Freeze Frame Data and Data List. (a) Check the auxiliary battery voltage. Standard Voltage: 11 to 14 V If the voltage is below 11 V, recharge the auxiliary battery before proceeding to the next step. (b) Check the DLC3. Click here DIAGNOSIS (a) If the skid control ECU (brake booster with master cylinder assembly) detects a malfunction, the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights will come on in order to warn the driver. Also, if the vehicle is under the following conditions and the brake hold switch (electric parking brake switch assembly) is turned on, the brake hold operated indicator light blinks.
(b) DTCs are simultaneously stored in memory. The DTCs can be read by connecting the Techstream. Click here (c) This system has a Test Mode (Signal Check) function. Click here DTC FOR RELATED SYSTEM MALFUNCTION (a) When the skid control ECU (brake booster with master cylinder assembly) detects DTCs stored by related systems, it stores DTCs to indicate the malfunctioning system. DTC for Related System Malfunction
HINT: The above DTCs may be stored in the skid control ECU (brake booster with master cylinder assembly) even if it was never stored as a history DTC or cleared in the system that caused the DTC to be stored. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK (a) When the power switch is turned on (IG), check that the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction), VSC OFF indicator, slip indicator, brake hold standby indicator and brake hold operated indicator lights all come on for approximately 3 seconds. HINT:
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Power Mirror Control System(for Gasoline Model With Memory): Lost Communication With Body Control Module "B" (U0142)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area U0142 Lost Communication with Main Body ECU No communication with main body ECU (multiplex network body ECU) CAN communication system Main body ECU (multiplex network body ECU) PROCEDURE 1. GO TO CAN COMMUNICATION SYSTEM HINT: R ...
