GENERAL INFORMATION
Note. During this fault-tracing use the wiring diagram to provide support when taking readings.
The diagnostic trouble code (DTC) is stored in the event of communication faults on the low speed side of the control area network (CAN). There can be a number of causes for faults in the communication
- Intermittent open-circuits in one or both CAN cables in part of the network
- Intermittent short-circuits between the CAN cables
- Intermittent short-circuits between one of the CAN cables and ground or supply voltage
- Fault in the communication circuit in one or more control modules
- Internal fault in a control module on the CAN network that results in the control module transmitting faulty messages on the CAN network.
Note. In the event of a diagnostic trouble code (DTC) for a communication fault in a control module, the central electronic module (CEM) must also be checked for diagnostic trouble codes (DTCs). The central electronic module (CEM) monitors the voltage level in the CAN cables. The central electronic module (CEM) is the only control module that can directly store a diagnostic trouble code (DTC) for a short-circuit in one of the cables for ground or supply voltage. Do not replace the central electronic module (CEM) in the event of a CAN fault unless fault-tracing has indicated that the central electronic module (CEM) has an internal fault.
In order to check the control area network (CAN) cables, the resistance in the network must be measured.
Other information
- see «GENERAL INFORMATION ABOUT FAULT-TRACING IN THE CAN NETWORK»(ref-466603-S14975733402012042500000)
- Continue Refer to «TAKING READING ON CABLES IN THE CAN NETWORK (LS-CAN)»(ref-466773-S40602025362012042500000)
Note. During this fault-tracing use the wiring diagram to provide support when taking readings.
The diagnostic trouble code (DTC) is stored in the event of communication faults on the low speed side of the control area network (CAN). There can be a number of causes for faults in the communication
- Intermittent open-circuits in one or both CAN cables in part of the network
- Intermittent short-circuits between the CAN cables
- Intermittent short-circuits between one of the CAN cables and ground or supply voltage
- Fault in the communication circuit in one or more control modules
- Internal fault in a control module on the CAN network that results in the control module transmitting faulty messages on the CAN network.
Note. In the event of a diagnostic trouble code (DTC) for a communication fault in a control module, the central electronic module (CEM) must also be checked for diagnostic trouble codes (DTCs). The central electronic module (CEM) monitors the voltage level in the CAN cables. The central electronic module (CEM) is the only control module that can directly store a diagnostic trouble code (DTC) for a short-circuit in one of the cables for ground or supply voltage. Do not replace the central electronic module (CEM) in the event of a CAN fault unless fault-tracing has indicated that the central electronic module (CEM) has an internal fault.
In order to check the control area network (CAN) cables, the resistance in the network must be measured.
Other information
- see «GENERAL INFORMATION ABOUT FAULT-TRACING IN THE CAN NETWORK»(ref-466603-S14975733402012042500000)
- Continue Refer to «TAKING READING ON CABLES IN THE CAN NETWORK (LS-CAN)»(ref-466773-S42617891402012042500000)
A message (ID number) is sent out on the CAN network at regular intervals from the Central electronic module (CEM). Other control modules listen for this message, typically at the following occasions
- When the control module has been without power.
- After downloading the software.
- Certain control modules listen for the message each time the ignition is switched off.
This diagnostic trouble code indicates that the control module has not received any identity number, or that the expected number is not correct. The diagnostic trouble code is set if the control module has not received correct identity number within a certain time interval, from and incl. the occurrence of any of the above. The time interval is 4.5 or 7 seconds long, depending on control module.
Corrective actions
- If this type of diagnostic trouble code is stored in the control module that set the diagnostic trouble code, this indicates incorrect configuration-id in the control module. A possible cause is that a used control module has been installed in the car without loading software. Solve the problem by reloading the software in the control module.
- In some cases, the DTC can also be generated due to an open-circuit or other interference on the CAN wiring between the control module and the Central electronic module (CEM). These types of faults must, however, be first detected by other DTCs. Fault trace starting from these DTCs.
Other information
- Go to the software manager and program the control module with the latest software.
- see «GENERAL INFORMATION ABOUT FAULT-TRACING IN THE CAN NETWORK»(ref-466603-S14975733402012042500000)
A message (ID number) is sent out on the CAN network at regular intervals from the Central electronic module (CEM). Other control modules listen for this message, typically at the following occasions
- When the control module has been without power.
- After downloading the software.
- Certain control modules listen for the message each time the ignition is switched off.
This diagnostic trouble code indicates that the control module has not received any identity number, or that the expected number is not correct. The diagnostic trouble code is set if the control module has not received correct identity number within a certain time interval, from and incl. the occurrence of any of the above. The time interval is 4.5 or 7 seconds long, depending on control module.
Corrective actions
- If this type of diagnostic trouble code is stored in the control module that set the diagnostic trouble code, this indicates incorrect configuration-id in the control module. A possible cause is that a used control module has been installed in the car without loading software. Solve the problem by reloading the software in the control module.
- In some cases, the DTC can also be generated due to an open-circuit or other interference on the CAN wiring between the control module and the Central electronic module (CEM). These types of faults must, however, be first detected by other DTCs. Fault trace starting from these DTCs.
Other information
- Go to the software manager and program the control module with the latest software.
- see «GENERAL INFORMATION ABOUT FAULT-TRACING IN THE CAN NETWORK»(ref-466603-S14975733402012042500000)