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ФУНКЦИЯ ДИАГНОСТИКИ
При отсутствии сигнала от блока управления SRS блок управления ETACS регистрирует диагностический код № U0151.
КРИТЕРИИ ОЦЕНКИ
После подтверждения следующих статусов в течение 5 секунд и при отсутствии связи с блоком управления SRS в течение 2500 мс или более блок управления ETACS определяет, что возникла неисправность.
- В сети необычные явления не наблюдаются.
- Ключ зажигания находится в положении ON.
- Предохранитель питания IOD, в норме, показания одометра составляют не менее 80,5 км.
- Напряжение блока управления системы ETACS составляет от 10 до 16 В.
ВОЗМОЖНЫЕ ПРИЧИНЫ
- Неисправность блока управления системой SRS
- Неисправность блока управления ETACS
- Неисправность шины CAN
ПРОЦЕДУРА ДИАГНОСТИКИ
ЭТАП 1. Диагностика шины CAN с помощью прибора M.U.T.-III
Для диагностики шины CAN используйте прибор M.U.T.-III.
Q. Результат проверки соответствует норме?
Переходите к этапу 2.
Отремонтируйте шину CAN (см. ГЛАВУ 54C — Поиск и устранение неисправностей 
).
ЭТАП 2. Проверка диагностических кодов других систем с помощью прибора M.U.T.-III
Проверьте, зарегистрирован ли диагностический код для блока управления SRS.
Q. Записан ли диагностический код?
Выполните диагностику системы подушек безопасности (SRS)(см. ГЛАВУ 52B − Поиск и устранение неисправностей ).
Переходите к этапу 3
ЭТАП 3. Проверьте, записан ли диагностический код снова.
Снова проверьте, записан ли диагностический код в блоке управления системой ETACS.
| (1) Удалите диагностический код. |
| (2) Переведите выключатель зажигания из положения LOCK (OFF) в положение ON. |
| (3) Проверьте, записан ли диагностический код. |
Q. Записан ли диагностический код?
Замените блок управления SRS, затем переходите к этапу 4.
В линиях шины CAN между блоком управления SRS и блоком управления ETACS возможны такие периодически появляющиеся неисправности как ненадлежащее соединение или обрыв (см. ГЛАВУ 00 — Как пользоваться разделом «Поиск и устранение неисправностей»/Проверка технического состояния – Как устранять периодически появляющиеся неисправности ).
ЭТАП 4. Проверьте, записан ли диагностический код снова.
Снова проверьте, записан ли диагностический код в блоке управления системой ETACS.
| (1) Удалите диагностический код. |
| (2) Переведите выключатель зажигания из положения LOCK (OFF) в положение ON. |
| (3) Проверьте, записан ли диагностический код. |
Q. Записан ли диагностический код?
Замените блок управления ETACS, затем возвращайтесь к этапу 1.
В линиях шины CAN между блоком управления SRS и блоком управления ETACS возможны такие периодически появляющиеся неисправности как ненадлежащее соединение или обрыв (см. ГЛАВУ 00 — Как пользоваться разделом «Поиск и устранение неисправностей»/Проверка технического состояния – Как устранять периодически появляющиеся неисправности ).
MMC-Manuals.ru
OBD-II DTC Datasheet
Lost Communication With Restraint Control Module (RCM)
What does this mean?
This is a generic communication system diagnostic trouble code that applies to most makes and models of vehicles.
This code means that the Restriction Control Module (RCM) and other control modules on the vehicle are not communicating with each other. The circuitry most commonly used for communication is known as Controller Area Bus communication, or simply the CAN bus.
Without this CAN bus, control modules cannot communicate and your scan tool may not receive information from the vehicle, depending on which circuit is involved.
The RCM is usually located behind the dashboard, usually in the center of the vehicle. It accepts input data from various sensors, some of which are directly connected to it, and some are sent over a bus communication system. The most important inputs of these sensors are the collision or collision sensors. This input allows the module to determine when a collision has occurred or when the vehicle is simply slowing down quickly. The difference between the two is that the RCM can take no action, can activate the seat belt pretensioners, or activate the pretensioners and passive restraints / airbags.
Troubleshooting steps may vary depending on the manufacturer, the type of communication system, the number of wires, and the colors of the wires in the communication system.
Severity and symptoms
The severity in this case is always serious due to the safety issues that arise in a non-functional restraint control system. Safety is ANYONE’s concern when you service these systems because they can continue to operate even when the warning lights are on. ALWAYS treat these systems as if they could work at any time.
Symptoms of a U0151 engine code may include:
- Airbag light is on or flashing
reasons
Usually the reason for installing this code is:
- Open in CAN + bus circuit
- Open in the CAN bus — electrical circuit
- Short circuit to power in any CAN bus circuit
- Short to ground in any CAN bus circuit
- Rarely — the control module is faulty
Diagnostic and repair procedures
A good starting point is always to check the Technical Service Bulletins (TSB) for your particular vehicle. Your problem may be a known issue with a known manufacturer-released fix and could save you time and money while troubleshooting.
First, look for other DTCs. If any of these are related to the tire, vehicle identification number (VIN), or battery / ignition, diagnose them first. Misdiagnosis is known to occur if you diagnose the U0151 code before any of the major codes are thoroughly diagnosed and rejected.
If your scan tool can access trouble codes and the only code you are getting from other modules is U0151, try accessing the RCM. If you can access the codes from the RCM, then code U0151 is either an intermittent or memory code. If the RCM cannot be accessed, then code U0151 that other modules set is active and the problem already exists.
The most common failure is a loss of power or ground to the RCM.
Check all fuses supplying the RCM on this vehicle. Check all the reasons for RCM. Locate ground anchorage points on the vehicle and make sure these connections are clean and secure. If necessary, remove them, take a small wire bristle brush and baking soda / water solution and clean each one, both the connector and the place where it connects.
If any repairs have been made, clear the DTCs from memory and see if U0151 returns or you can contact the RCM. If no code is returned or communication is restored, the problem is most likely a fuse / connection issue.
BEFORE DISCONNECTING THE CONNECTORS ON THE RCM, MAKE SURE THE SYSTEM IS TURNED OFF ACCORDING TO THE MANUFACTURER’S PROCEDURES! IF NO, POSSIBLE VEHICLE DAMAGE OR PERSONAL INJURY DUE TO UNINTENDED DEPLOYMENT OF THE AIRBAG. ALSO, THE AIRBAGS ARE DISCONNECTED DURING THE FOLLOWING TESTS AS A FINAL SAFETY MEASURE!
If the code returns, look for the CAN bus connections on your specific vehicle, especially the RCM connector. Disconnect the negative battery cable before disconnecting the connector on the RCM. Once detected, visually inspect the connectors and wiring. Look for scratches, scuffs, exposed wires, burn marks, or molten plastic. Disconnect the connectors and carefully inspect the terminals (metal parts) inside the connectors. See if they look burnt or have a green tint indicating corrosion. If you need to clean the terminals, use an electrical contact cleaner and a plastic bristle brush. Allow to dry and apply electrical grease where the terminals touch.
Perform these few voltage checks before connecting the connectors back to the RCM. You will need access to a digital volt/ohmmeter (DVOM). Make sure the RCM has power and ground. Access the wiring diagram and determine where the main power and ground supplies enter the RCM. Reconnect the battery before continuing with the RCM still disabled. Connect the red lead of your voltmeter to each B+ (battery voltage) power supply plugged into the RCM connector, and the black lead of your voltmeter to a good ground (if unsure, battery negative always works). You should see the battery voltage reading. Make sure you have a good reason. Connect the red lead of the voltmeter to the battery positive (B+) and the black lead to each ground circuit. Once again, you should see the battery voltage every time you connect. If not, repair the power or ground circuit.
Before proceeding, check your wiring diagram and see if you have one or both of these different communication circuits in the RCM; Carry out the checks related to the circuits in your vehicle.
Then check the two communication circuits. Locate CAN C+ (or HSCAN+) and CAN C- (or HSCAN — circuit). With the black wire of the voltmeter connected to a good ground, connect the red wire to CAN C+. With the key on and engine off, you should see about 2.6 volts with little fluctuation. Then connect the red wire of the voltmeter to the CAN C- circuit. You should see about 2.4 volts with little fluctuation.
Then check the other two communication circuits. Locate CAN B+ (or MSCAN + circuit) and CAN B- (or MSCAN — circuit). With the black wire of the voltmeter connected to a good ground, connect the red wire to CAN B+. With the key on and the engine off, you should see a voltage of about 0.5 volts with little fluctuation. Then connect the red lead of a voltmeter to the CAN B circuit. You should see about 4.4 volts with slight fluctuations.
If all tests pass and communication is still not possible, or you were unable to reset DTC U0151, the only thing to do is to seek help from a trained automotive diagnostician as this will point to a bad RCM. Most of these RCMs need to be programmed or calibrated for the vehicle in order to install them correctly.
Related DTC discussions
- 2016 F150 Ground fault codes U0151 U0452 B11D8 B1472 B1330 U0131 B1088 U0420 etc.Hi, I have a 2016 year Ford F150 and am getting a few short to ground complaints codes from horn, auto light switch, headlights and the like. From what I was looking for, I think there is a short in the CAN bus, but I don’t know where to start. Below is a list …
- no start, range rover 07 hse 4.4 U0151 p0222, p0122, p2105Hm !! there is a problem with no start, cranks n starts the engine without starting … the code U0151 does not interfere with communication … it will cause no start … or po222, po122, po2105 .. need help, thanks, …
- 2005 Mazda 3 U0151 Lost Communication With RCMHi I have a problem with my car, the airbag light is on, my car is a mazda 3 2005 1600, RCM module, refurbished in the USA, but I have this code U0151, I have already done the procedure on the website https://www .obd-codes.com/u0151, this Mazda has two CAN C or HSCAN communication circuits and…
Need more help with code u0151?
If you still need help with DTC U0151, post a question in the comments below this article.
NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.
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DIAGNOSTIC FUNCTION
JUDGMENT CRITERIA
- No abnormality is present to the network.
- Ignition switch is in the ON position.
- No abnormality is present to the power supply fuse (IOD fuse), or the odometer value is at 80.5 km or more.
- ETACS-ECU system voltage is at 10-16 V.
PROBABLE CAUSES
- Malfunction of the SRS-ECU
- Malfunction of the ETACS-ECU
- Malfunction of the CAN bus
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Q.
Is the check result normal?
STEP 2. M.U.T.-III other system diagnosis code
Q.
Is the diagnosis code set?
STEP 3. M.U.T.-III other system diagnosis code
Q.
Is the diagnosis code set?
STEP 4. Check whether the diagnosis code is reset.
| (1)Erase the diagnosis code. |
| (2)Turn the ignition switch from «LOCK» (OFF) position to «ON» position. |
| (3)Check if diagnosis code is set. |
Q.
Is the diagnosis code set?
STEP 5. Check whether the diagnosis code is reset.
| (1)Erase the diagnosis code. |
| (2)Turn the ignition switch from «LOCK» (OFF) position to «ON» position. |
| (3)Check if diagnosis code is set. |
Q.
Is the diagnosis code set?
Найдена следующая информация по ошибке U0151 для автомобиля MITSUBISHI LANCER (2007-2014), CX:
На русском языке:
Шина данных, блок управления SRS — нет связи
На английском языке:
Lost Communication With Restraints Control Module
Вы можете задать вопрос или поделиться опытом устранения ошибки U0151 на автомобиле MITSUBISHI с другими пользователями.
Возможную причину возникновения и советы по устранению можно найти в каталоге причин и советов:
Найти причину >>>
Ошибки (коды ошибок) полученные от прибора, сканера требуют правильной интерпретации информации, дабы не тратить время и деньги на замену работающих элементов автомобиля.
Проблема зачастую кроется намного глубже чем кажется на первый взгляд. Это& вызвано теми обстоятельствами, что информационные сообщения содержат, как было выше сказано, косвенную информацию о нарушении работы системы.
Может быть полезным для решения вопроса по устранению неисправности у Mitsubishi Lancer (CX):
Шина данных, блок управления SRS — нет связи
Lost Communication With Restraints Control Module
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DIAGNOSTIC FUNCTION
If the signal from SRS-ECU cannot be received, the CAN box unit sets the diagnosis code No. U0151.
JUDGEMENT CRITERIA
With the statuses that the ignition switch is at ON position, system voltage is 10-16 V (data from ETACS-ECU), and there is no malfunction to the power supply fuse (IOD fuse), or odometer value is 80.5 km or more, if the communication with SRS-ECU cannot be established for 2,500 ms or more, the CAN box unit determines that a problem has occurred.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of the SRS-ECU
- Malfunction of CAN box unit
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C — Troubleshooting 
).
STEP 2. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set to the SRS-ECU.
Q.
Is the diagnosis code set?
Troubleshoot the SRS-ECU (Refer to GROUP 52B — Troubleshooting ).
Go to Step 3.
STEP 3. Check the M.U.T.-III Diagnosis code for other systems
Check if the diagnosis code No. U0151 is set to combination meter.
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to the CAN box unit.
| (1)Erase the diagnosis code. |
| (2)Turn the ignition switch from the LOCK (OFF) position to the ON position. |
| (3)Check if the diagnosis code is set. |
Q.
Is the diagnosis code set?
Replace the SRS-ECU.
A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the CAN box unit and the SRS-ECU. (Refer to GROUP 00 — How to Use Troubleshooting/Inspection Service Points — How to Cope with Intermittent Malfunction .)
STEP 5. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the CAN box unit.
| (1)Erase the diagnosis code. |
| (2)Turn the ignition switch from «LOCK» (OFF) position to «ON» position. |
| (3)Check if diagnosis code is set. |
Q.
Is the diagnosis code set?
Replace the CAN box unit.
A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the CAN box unit and the SRS-ECU. (Refer to GROUP 00 — How to Use Troubleshooting/Inspection Service Points — How to Cope with Intermittent Malfunction .)
faq.Lancer-Club.ru