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ABS DIAGNOSIS TSB Revision ANTI-LOCK BRAKING SYSTEM (ABS) 35B-157 Inspection Procedure 3: ABS warning light does not illuminate when ignition switch is turned to the CAUTION • If there is any problem in the CAN bus lines, an incor- rect DTC may be set. Prior to this diagnosis, diagnose − CAN Bus Line Diagnostic Flow • Whenever ECU is replaced, ensure that the CAN bus lines are normal. . SYSTEM OPERATION • ABS-ECU sends the illumination request signal of the ABS warning light to the combination meter through • ABS-ECU illuminates the ABS warning light via ETACS-ECU for approximately 3 seconds for valve check . TECHNICAL DESCRIPTION (COMMENT) This may be caused by faults in the CAN bus line, . PROBABLE CAUSES • Damaged wiring harness and connectors • Malfunction of ETACS-ECU • Combination meter malfunction • ABS-ECU malfunction • Malfunction of coding data for ETACS-ECU DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (M.U.T.-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991827: M.U.T.-III USB Cable • MB991910: M.U.T.-III Main Harness A STEP 1. Using scan tool MB991958, diagnose the CAN bus YES : Go to Step 2. − CAN Bus Diagnostics Table ). Then go to Step 9. |