BMW F18 N52T Engine 2E7C BSD CAN BUS Communication Fault

This instruction show you guide on how to solve BMW F18 N52T engine car 2E7C BSD CAN BUS communication fault.

 

BMW error code 2E7C indicates a communication fault in the Bit-Serial Data Interface (BSD)12, which is a data bus that connects various components such as the alternator, the battery sensor, the oil condition sensor, and the engine control unit.

 

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Reason:

DME internal fault, LIN bus transceiver is damaged.

Replace No. 1 on the right side of the picture below. TJA1020 chip, if there is a fault code DME internal fault SPI communication protocol fault, Replace the TJA1020 chip No. 2 on the left together.

 

 

PINNING:

RXD PIN 1

Receive data output (open-drain);active LOW after a wake-up event

 

NSLP PIN 2:

Sleep control input (active LOw);controls inhibit output; resets wake-up source flag on TXD and wake-up request on RXD

 

NWAKE PIN 3:

Local wake-up input (active LOW);negative edge triggered

 

TXD PIN4:

Transmit data input; active LOW output after a local wake-up event

 

GND PIN 5:

Ground

 

LIN PIN 6:

LIN bus line input/output

 

BAT PIN 7:

Battery supply

 

INH PIN 8

Battery related inhibit output for controlling an extemal voltage regulator;active HIGH after a wake-up event

PIN 6 is the LIN signal input and output terminal. The normal output voltage is close to the power storage Cell voltage, the picture above is the standard waveform