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DIAGNOSIS Required Special Tools: ⦆ MB991958: Scan Tool (M.U.T.-III Sub Assembly) ⦆ MB991824: Vehicles Communication Interface (V.C.I.) ⦆ MB991827: M.U.T.-III USB Cable ⦆ MB991910: M.U.T.-III Main Harness A (Vehicles with STEP 1. Using scan tool MB991958, diagnose the CAN bus ZC501967 AC404789 ZC5019680000 MB991824 MB991827 MB991910 Data link connector To prevent damage to scan tool MB991958, always turn the (1) Connect scan tool MB991958. Refer to "How to connect the (2) Turn the ignition switch to the "ON" position. (3) Diagnose the CAN bus line. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to GROUP 54D, STEP 2. Using scan tool MB991958, read the ETACS-ECU Q:Is the DTC set? YES: Diagnose the ETACS-ECU (Refer to GROUP 54Ad, NO: Go to Step 3. STEP 3. Recheck for diagnostic trouble code. (1) Erase the DTC. (2) Turn the ignition switch from "LOCK" (OFF) position to "ON" (3) Check if DTC is set. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the DTC set? YES: Replace the SRS-ECU. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, SUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-267 SRS AIR BAG DIAGNOSIS |