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DIAGNOSIS SYSTEM (VDC/TCS/ABS CONTROL UNIT) BRC-45 < FUNCTION DIAGNOSIS > [VDC/TCS/ABS] C D E G H I J K L M A B BRC N O P DIAGNOSIS SYSTEM (VDC/TCS/ABS CONTROL UNIT) CONSULT-III Function INFOID:0000000004212634 DIAGNOSIS SYSTEM Description When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the CONSULT-III to the vehicle and reading various data output from the vehicle ′s brake ECU. The brake ECU records DTCs when the computer detects a malfunction in the computer itself or in its circuits. To check for DTCs, activate the various actuators, and check the Freeze Frame Data and Data List. If the voltage is below 11 V, recharge the auxiliary battery before proceeding to the next step. 2. Check the DLC3. The ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and con- nector. Verify the conditions listed in the table below. *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other NOTE: • Connect the cable of the CONSULT-III to the DLC3, turn the ignition switch ON and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester. • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle. • If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. CONSULT-III the Service Department listed in the tester operator ′s instruction. Diagnosis 1. If the brake ECU detects a malfunction, the ABS warning lamp, brake warning lamp, Electronically Con- trolled Brake warning lamp, VDC warning lamp, and SLIP indicator lamp will come ON. The table below indicates which lamps will come ON when there is a malfunction in a particular function. ×: Light ON –: Light OFF Standard voltage : 11 to 14 V Symbols (Terminal No.) Terminal description Condition Specified condition 7 – 5 Bus “+” line During transmission Pulse generation 4 – Ground Chassis ground Always Below 1 Ω 5 – Ground Signal ground Always Below 1 Ω 16 – Ground Battery positive Always 11 to 14 V 6 – 14 CAN communication line Ignition switch OFF* 54 to 69 Ω 6 – 4 CAN-H line Ignition switch OFF* 200 Ω or higher 14 – 4 CAN-L line Ignition switch OFF* 200 Ω or higher 6 – 16 CAN-H line Ignition switch OFF* 6 k Ω or higher 14 – 16 CAN-L line Ignition switch OFF* 6 k Ω or higher Item / Trouble area ABS EBD TCS VDC ABS warning lamp × × — — Brake warning lamp — × — — Electronically Controlled Brake warning lamp × × — — VDC warning lamp × × × × |