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DIAGNOSIS TSB Revision KEYLESS OPERATION SYSTEM (KOS) 42B-167 Code No.U1417 Implausible coding data CAUTION • If DTC U1417 is set in KOS-ECU, always diagnose the CAN bus lines. If there is any fault in the CAN bus lines, • Before replacing the ECU, ensure that the communica- tion circuit is normal. • When diagnostic trouble code U1417 is set in KOS-ECU, the diagnostic trouble code may also be set . CIRCUIT OPERATION KOS-ECU receives the vehicle information stored in the . DTC SET CONDITIONS KOS-ECU communicates with ETACS-ECU via CAN bus lines. . PROBABLE CAUSES • Malfunction of ETACS-ECU • Engine control module malfunction • ETACS-ECUs have been interchanged between two vehi- cles. • KOS-ECU 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 |