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DIAGNOSIS <TC-SST> TSB Revision TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST) 22C-77 DTC P1637: EEPROM System (DTC storing malfunction) CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be • Whenever the ECU is replaced, ensure that the CAN bus lines are normal. . DIAGNOSTIC FUNCTION TC-SST-ECU checks that EEPROM in TC-SST-ECU . DESCRIPTIONS OF MONITOR METHODS The EEPROM writing data is determined to be . MONITOR EXECUTION • Continuous . MONITOR EXECUTION CONDITIONS Other Monitor (There is no temporary DTC stored in memory for the item monitored below) • Not applicable Sensor (The sensor below is determined to be normal) • Not applicable . LOGIC FLOW CHARTS (Monitor Sequence) . DTC SET CONDITIONS Check Conditions • Voltage of battery: 8 V or more. • Voltage of battery: 16.5 V or less. JUDGMENT CRITERIA • Calculated checksum: Not equal the memorized checksum. . OBD-II DRIVE CYCLE PATTERN The calculated checksum corresponds with the . PROBABLE CAUSES • Malfunction of TC-SST-ECU AC710668 START No Good Malfunction END Monitoring condition met Yes Yes No |