Question about 2002 Nissan Sentra
Transmitting control module not communicating with ecm
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Posted on Jan 02, 2017
ecm is located on r/h side of the firewall. you will see this black plastic piece sticking out of the firewall. its attached with 2 10mm socket bolts. remove those and pull on the box and the em will come out of the firewall.
Posted on May 27, 2010
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Power Steering Control Module (PSCM)
Instrument Panel Cluster (IPC)
Inflatable Restraint Sensing and Diagnostic Module (SDM)
Vehicle Communication Interface Module (VCIM), if equipped Controller Area Network (CAN)
The controller area network (CAN) serial data line is a high speed serial data bus used to communicate traction information between the electronic brake control module (EBCM), the engine control module (ECM), the body control module (BCM), and the transaxle control module (TCM). Typical data-transmission speeds must be high enough to ensure that the required real-time response is maintained.
The addressing scheme employed with CAN assigns a label to every message, with each message receiving a unique identifier. The identifier classifies the content of the message, such as engine speed.
Each module processes only those messages whose identifiers are stored in the module's acceptance list. This is CAN's form of message filtering.
The identifier labels both the data content and the priority of the message being sent. Each module can begin transmitting its most important data as soon as the bus is unoccupied. When more than one module starts to transmit simultaneously, the message with the highest priority is assigned first access. A module responds to failure to gain access by automatically switching to receive mode. The module then repeats the transmission attempt as soon as the bus is free again.
You need to have a professional scan tool to check for codes in the modules other than the engine ecm module. I have seen a bad instrument cluster short the bus and cause the vehicle shut down . hope this helps ! First place to start is checking for codes in all the modules. If there is a problem with one of them ,it usually sets a code in one of the other modules !
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