LI54.10-P-054690
Service Bulletin Details
Public Details for: LI54.10-P-054690
Vehicle sporadically fails to start or can no longer be started
- 2007 -
Models from 2007
2007 MERCEDES BENZ S221 |
Vehicle sporadically fails to start or can no longer be started Topic number LI54.10-P-054690 Version 3 Design group 54.10 Battery, voltage supply, voltage converter Date 05-13-2014 Validity Models 221.095 and 221.195 (Hybrid) Reason for change Capacitance limit increased from 800 µF to 950 µF Reason for block Complaint: • • • • • Combustion engine sporadically fails to start. Combustion engine can only be restarted after a waiting period of approx. one hour. Combustion engine can no longer be started. Start/stop function is sporadically unavailable (READY displayed in yellow in instrument cluster). Fault code "current and stored" in electric motor control unit (SG-EM) (see control unit fault code). Cause: Due to reduced capacitance of the high-voltage intermediate circuit capacitor in the power electronics (N129/1), the hybrid functions (e.g. start/stop, boost, regenerative braking) may be deactivated. If the capacitance of the high-voltage intermediate circuit capacitor is severely reduced (less than 950 µF), engine start can be suppressed either occasionally/sporadically or permanently. Because of this, the 30A fuse of the HV battery (output to DC/DC converter) may also have blown. Remedy: Requirement: - Use a battery charger to ensure that the voltage supply of the vehicle's on-board electrical system battery is sufficient (greater than 12.5V).. Work instructions: 1 Check fault memory in electric motor control unit (SG-EM) for phase errors. If at least one of the following fault codes (FC) is present in the SG-EM control unit with status "stored" and/or "current and stored", the SG-EM control unit must be replaced and the test terminated (steps 2 to 5 should not now be performed): - P0A5D00 The connection 'Phase U' of electrical machine A has a malfunction. - P0A6000 The connection 'Phase V' of electrical machine A has a malfunction. - P0A6300 The connection 'Phase W' of electrical machine A has a malfunction. 2 Check software (SW) in SG-EM control unit and update if necessary (ring flash: SG-BMS, SG-DDW and SG-EM). If SW version 12.04.00 is present in the SG-EM control unit, continue with step 4. If older software is present, install the latest software. To do this, select menu item “Control units – Drive – SG-EM electric motor control unit – Control unit adaptations – Control unit programming”. After the software update, return to the control unit groups menu item. 05-13-2014 9:40 AM © Copyright Daimler AG RWEINGA Page 1/3 3 Determine total capacitance in electric motor control unit SG-EM. 3.1 Create SG-EM control unit log. To do this, select menu item “Control units – Drive – SG-EM electric motor control unit – Control unit log” and create the control unit log. Then read off the value “Average value of total capacitance” in the SG-EM control unit log. If a value of 0 µF is shown, continue with step 3.2. If a value greater than 1µF is shown, continue with step 4. 3.2 Start combustion engine and switch off again (or circuit 15). Remove ignition key and leave removed for at least 2 minutes. During this period, do not operate any electrical consumers and leave all doors/flaps closed (wait for bus idle). DAS/XENTRY and battery charger remain connected. This procedure must be repeated six times! Then perform a "control unit reset" (to be found under "Actuations"). Afterwards create another SG-EM control unit log and read off the value “Average value of total capacitance” in the SG-EM control unit log. 4 Evaluate total capacitance (value “Average value of total capacitance”) from SG-EM control unit log. If the average value is less than 950 µF, the power electronics must be replaced. 5 Check 30A fuse of HV battery for proper operation (continuity test). The test can be found in DAS/Xentry in the battery management system control unit (SG-BMS) at the following path: “Troubleshooting via complaints and symptoms” => “Initial startup of high-voltage on-board electrical system not possible. Voltage of high-voltage on-board electrical system at component N83/1 (DC/DC converter control unit) = 0 V.” If the 30A fuse is defective, the HV battery must be replaced. Symptoms Overall vehicle / Power supply / Battery/On-board electrical system / Battery function / Battery discharges Power generation / Engine management / Engine start/stop / Does not start Power generation / Engine management / Engine management indicator lamp / READY indicator / Does not illuminate Control unit/fault code Control unit Fault code Fault text SG-EM-Electric motor control unit (SGEM) P0A1E00 Component N129/1 (Power electronics control unit) has a malfunction. SG-EM-Electric motor control unit (SGEM) P0A5D00 Connection 'Phase U' of electric machine A has a malfunction. SG-EM-Electric motor control unit (SGEM) P0A6000 Connection 'Phase V' of electric machine A has a malfunction. SG-EM-Electric motor control unit (SGEM) P0A6300 Connection 'Phase W' of electric machine A has a malfunction. SG-EM-Electric motor control unit (SGEM) P0C0C00 The power supply of the high-voltage on-board electrical system for inverter 'Electric machine A' has a short circuit to ground. SG-EM-Electric motor control unit (SGEM) P160A00 The capacitor of the power inverter has a malfunction. SG-EM-Electric motor control unit (SGEM) P160B00 There is a warning about the capacitor of the power inverter. Parts Part number ES1 ES2 Designation 05-13-2014 9:40 AM © Copyright Daimler AG Quantity Note RWEINGA EPC Other ma- Page 2/3 ke part A 000 906 47 03 Rectifier 1 Electric motor control unit (SGEM) X A 221 343 11 00 LI-ION BATTERY 1 HV battery (SG-BMS) X Work units Op. no. Operation text Time 54-1011 PERFORM DAS QUICK TEST AND ERASE FAULT CODE 08-1200 REMOVE/INSTALL POWER ELECTRONICS WITH POWER DISTRIBUTOR, REPLACE IF NECESSARY 54-1014 PERFORM POWER DISCONNECT/INITIAL STARTUP OF HIGH-VOLTAGE ON-BOARD ELECTRICAL SYSTEM 83-1762 EXTRACT REFRIGERANT, CHECK FOR LEAKS, REFILL 54-1153 REPLACE HIGH-VOLTAGE BATTERY Damage code Note 5441B 73 Damage code: 5441B (high-voltage intermediate circuit capacitor) It is not necessary to replace the fluid reservoir for this repair. 5441B 73 Damage code: 5441B (high-voltage intermediate circuit capacitor) to be used, as consequential faults arise from a defective "high-voltage intermediate circuit capacitor". WIS-References Document number Title Note Allocation AR08.10-P-0011SXH Remove/install power electronics with power distributor Remedy AR54.10-P-1140SXH Remove/install high-voltage battery Remedy Validity Vehicle Engine Transmission 221.095 * * 221.195 * * 05-13-2014 9:40 AM © Copyright Daimler AG RWEINGA Page 3/3