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DIAGNOSIS TSB Revision WIRELESS CONTROL MODULE (WCM) 42C-81 PROBABLE CAUSES • Malfunction of ETACS-ECU • Engine control module malfunction • ETACS-ECUs have been interchanged between two vehi- cles. • WCM malfunction • External noise interference • WCMs have been interchanged between two vehicles. 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 CAUTION To prevent damage to scan tool MB991958, always turn the Scan Tool (M.U.T.-III) (2) Turn the ignition switch to the "ON" position. YES : Go to Step 2. ). AC608435 Data link connector MB991827 MB991824 MB991910 AB |