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TROUBLESHOOTING <OSS-ECU> KEYLESS OPERATION SYSTEM (KOS) 42B-73 JUDGEMENT CRITERIA Judgment Criterion • Chassis number or key code has the initial value (not written) PROBABLE CAUSES • Malfunction of the CAN bus line • Chassis number not written • Key code not written • Malfunction of OSS-ECU • Electric steering lock malfunction DIAGNOSIS PROCEDURE 1. M.U.T.-III CAN bus diagnosis <when B1159 or B1160 is set> 2. Chassis number registration 3. OSS-ECU diagnosis code recheck Code No. B1161 Chassis No. mismatch CAUTION • When the diagnosis code No.B1161 is set, be sure to diagnose the CAN bus line. • When replacing the ECU, always check that the communication circuit is normal. DIAGNOSTIC FUNCTION When the chassis number registered in OSS-ECU is JUDGEMENT CRITERIA Check Conditions • When all the following conditions are met. a. Power supply mode: ON Judgment Criterion • The chassis number received via CAN communi- cation is different from the chassis number written PROBABLE CAUSES • Malfunction of the CAN bus line • Writing error of chassis number to engine-ECU (engine-ECU has been interchanged between • Malfunction of OSS-ECU DIAGNOSIS PROCEDURE 1. M.U.T.-III CAN bus diagnosis 2. Check of chassis number in engine-ECU 3. OSS-ECU diagnosis code recheck Code No. B1163 Coding data mismatch CAUTION • When the diagnosis code No.B1163 is set, be sure to diagnose the CAN bus line. • When replacing the ECU, always check that the communication circuit is normal. DIAGNOSTIC FUNCTION When the coding data registered in OSS-ECU is dif- JUDGEMENT CRITERIA Check Conditions • For 5 seconds since the start of the reception of ignition status signal (ON or during cranking) Judgment Criterion • A coding data is received which is different from the current coding status. PROBABLE CAUSES • Malfunction of the CAN bus line • ETACS-ECU malfunction • ETACS-ECU has been interchanged between two vehicles • Malfunction of OSS-ECU DIAGNOSIS PROCEDURE 1. M.U.T.-III CAN bus diagnosis |