DLC Communication UNDER RESEARCH AND CONSTRUCTION BY HONDAINFO PLEASE BE PATIENT

DLC Communication UNDER CONSTRUCTION BY HONDAINFO

OBD0 (with 10 MHz MCU clock)

Mode: Serial communication UART mode, 187500 baud, 9 bit no parity, 1 stop

Protocol: send the byte you want to receive wait for response

Send 9 bit data to ECM.

9th bit = 0 - the first 8 bit will address the Internal RAM (0-255)

(send [START]xxxxxxxx0[STOP] to address IRAM)

9th bit = 1 - the first 8 bit will address the External RAM (0-255)

(send [START]xxxxxxxx1[STOP] to address ERAM)

ECM transmits the content of i/e RAM address

OBD1 (with 10MHz MCU clock)

Mode: Serial Communication Multiprocessor Mode, 62500 baud, 8 bit, odd parity, 1 stop

Protocol: send the byte (in different modes) you want to receive wait for response

Send byte in data transmit mode, odd parity - the first 8 bit will address the Internal RAM 0000h-00ffh

(send [START]xxxxxxxx0o[STOP])

Send byte in address transmit mode, odd parity - the first 8 bit will address the Internal RAM 0100h-01ffh

(send [START]xxxxxxxx1o[STOP])

Send byte in data transmit mode, even parity - the first 8 bit will address the Internal RAM 0200h-02ffh

(send [START]xxxxxxxx0e[STOP])

Send byte in address transmit mode, even parity - the first 8 bit will address the Internal RAM 0300h-03ffh

(send [START]xxxxxxxx1e[STOP])

Send 00 byte in data transmit mode, odd parity - If the previous address was even, the ECU sends back the high byte of the word at the previous address

(send [START]0000000001[STOP])

OBD2 (3 pin DLC) Currently there's no information :(

OTHER COMPUTERS Currently there's no information :(

Soon...

OBD0 See table of OBD0 RAM MAPS

OBD1 See table of OBD1 RAM MAPS

OBD2 Currently there's no information :(

%META:FILEATTACHMENT{name="OBD0RAMMAPS.xls" attr="" comment="" date="1117699353" path="C:\Documents and Settings\Beci\Asztal\Honda ECU ASM\OBD0 RAM MAPS.xls" size="19456" user="hondainfo" version="1.1"}% %META:FILEATTACHMENT{name="OBD1RAMMAPS.xls" attr="" comment="" date="1117699370" path="C:\Documents and Settings\Beci\Asztal\Honda ECU ASM\OBD1 RAM MAPS.xls" size="26624" user="hondainfo" version="1.1"}%

Soon...

DLC Communication UNDER CONSTRUCTION BY HONDAINFO PLEASE BE PATIENT

DLC Communication UNDER RESEARCH AND CONSTRUCTION BY HONDAINFO PLEASE BE PATIENT

OBD0

OBD0 (with 10 MHz MCU clock)

OBD1

Mode: Serial communication UART mode, 187500 baud, 9 bit no parity, 1 stop

OBD2 (3 pin DLC)

Protocol: send the byte you want to receive wait for response

OTHER COMPUTERS

Send 9 bit data to ECM.

9th bit = 0 - the first 8 bit will address the Internal RAM (0-255)

(send [START]xxxxxxxx0[STOP] to address IRAM)

9th bit = 1 - the first 8 bit will address the External RAM (0-255)

(send [START]xxxxxxxx1[STOP] to address ERAM)

ECM transmits the content of i/e RAM address

OBD1 (with 10MHz MCU clock)

Mode: Serial Communication Multiprocessor Mode, 62500 baud, 8 bit, odd parity, 1 stop

Protocol: send the byte (in different modes) you want to receive wait for response

Send byte in data transmit mode, odd parity - the first 8 bit will address the Internal RAM 0000h-00ffh

(send [START]xxxxxxxx0o[STOP])

Send byte in address transmit mode, odd parity - the first 8 bit will address the Internal RAM 0100h-01ffh

(send [START]xxxxxxxx1o[STOP])

Send byte in data transmit mode, even parity - the first 8 bit will address the Internal RAM 0200h-02ffh

(send [START]xxxxxxxx0e[STOP])

Send byte in address transmit mode, even parity - the first 8 bit will address the Internal RAM 0300h-03ffh

(send [START]xxxxxxxx1e[STOP])

Send 00 byte in data transmit mode, odd parity - If the previous address was even, the ECU sends back the high byte of the word at the previous address

(send [START]0000000001[STOP])

OBD2 (3 pin DLC) Currently there's no information :(

OTHER COMPUTERS Currently there's no information :(

3. Application layer

3. Application layer

OBD0

OBD0 See table of OBD0 RAM MAPS

OBD1

OBD1 See table of OBD1 RAM MAPS

OBD2 Currently there's no information :(

OBD2

%META:FILEATTACHMENT{name="OBD0RAMMAPS.xls" attr="" comment="" date="1117699353" path="C:\Documents and Settings\Beci\Asztal\Honda ECU ASM\OBD0 RAM MAPS.xls" size="19456" user="hondainfo" version="1.1"}% %META:FILEATTACHMENT{name="OBD1RAMMAPS.xls" attr="" comment="" date="1117699370" path="C:\Documents and Settings\Beci\Asztal\Honda ECU ASM\OBD1 RAM MAPS.xls" size="26624" user="hondainfo" version="1.1"}%

1. Physical layer

1. Physical Layer (Theoretical informations based on ISO 9141 - CARB Road Vehicles Diagnostic Systems standard)

2. Communication layer

Signal and Communication Specifications

Honda specifies different logic levels for the Receiver and Transmitter.

Receiver Logic Levels:

Logic “0” <= 0.3 * VBAT 0.7 * VBAT >= Logic “1”

Transmitter Logic Levels:

Logic “0” <= 0.2 * VBAT 0.8 * VBAT >= Logic “1”

A logic bit transition must be less than 10% of the total bit time. The transition time is measured between the 80% and 20% battery points. Bit time is defined as the time between the 50% battery points of consecutive rising and falling levels.

Physical Layer

CTE = Tester and Cables capacitance COBW = On-Board Wiring capacitance CECU = Sum of all ECU Input Capacitance where CECU + COBW is less or equal to 7.6 nF and CTE is less or equal to 2 nF. The capacitance of the DLC data line with respect to GND can be no greater than 500 pF.

2. Data Link Layer (Communication)

%META:TOPICINFO{author="hondainfo" date="1117198920" format="1.0" version="1.1"}% %META:TOPICPARENT{name="DataLogging"}% DLC Communication UNDER CONSTRUCTION BY HONDAINFO PLEASE BE PATIENT

1. Physical layer

2. Communication layer

OBD0

OBD1

OBD2 (3 pin DLC)

OTHER COMPUTERS

3. Application layer

OBD0

OBD1

OBD2