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Digital Tachometer for Harley Davidson Sportster (Part 4 - Bus Messages)

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Messages and Headers:

Following tables gather some of the messages that are being broadcasted through a 2011 Sportster Iron (XL883N) J1850 VPW bus for each one of the present control units (Engine, Display and Body Controller). Information has been obtained from:

Remark1: "???" Messages are those not identified.
Remark2: last byte from these messatges will always be the CRC, but it is not represented on the tables.


ECU Information R/S byte# Formula
#0 #1 #2 #3 #4 #5
E
N
G
I
N
E
RPM S 28 1B 10 02 XX YY rpm = (hex2dec(xx)*256+hex2dec(yy)) / 4
Speed S 48 29 10 02 XX YY kph= (hex2dec(xx)*256+hex2dec(yy)) / 128
MIL S 68 88 10 03 - - Active Failure tell-tale
83 - - Inactive Failure tell-tale
Gear S A8 3B 10 03 XX - 0xXX = 0x00, 0x02, 0x04, 0x08, 0x0A, 0x14
(decimal: 0,2,4,8,10,20) for 1st-5th gears
Eng Temp S A8 49 10 10 XX - ºC = hex2dec(XX) - 40
Odometer S A8 69 10 06 XX XX Resolution bit=0,4 meters
Odometer2 S A8 69 10 86 XX XX Same as before
Resolution de bit=0,4 meters
Fuel Consump S A8 83 10 0A XX XX Resolution bit=0,00005 liters
Fuel Consump 2 S A8 83 10 8A XX XX Same as before
Resolution bit=0,00005 liters
Low Voltage tell-tale R C8 88 10 0E - - Request to METER.
Answer:C8 88 61
#6 ??? - Network Control R 8C FE 10 60 - - Unknown Secondary ID (60)
#7 ??? - Network Control S 28 FF 10 01 XX - XX:0x07 o 0x06 (Unknown)
ECU Engine Status - Network Control S 68 FF 10 XX - - XX:0x03 (Node awaken) o 0x04 (Sleep Node)
#11 ??? - Vehicle Security S 28 93 10 02 XX - XX:0x00 (Unknown)
#12 ??? - Vehicle Security S 68 93 10 20 XX - XX:0x01 (Unknown)
#13 ??? - Vehicle Speed Control S 68 63 10 26 XX - XX:0x00 i 0x01 (Unknown)
Vehicle Speed Control R 68 62 10 XX - - XX:0x01 (Speed Control System ON/OFF)
XX:0x21 (Switch ON/OFF active)
#15 ??? - Vehicle Speed Control S 09 63 10 XX - - XX:0x20 (Unknown)
ECU Information R/S byte# Formula
#0 #1 #2 #3 #4 #5
D
I
S
P
L
A
Y
Fuel Level S A8 83 61 12 0X - X:0-F (0 a 15 steps)
#1 ??? - Network Control R 29 FE 61 01 - - Secondary ID (01) Unknown
#5 ??? - Vehicle Security S 68 93 61 XX YY ZZ XX,YY,ZZ Unknown
#16 ??? - Vehicle Security S 69 93 61 XX - - XX:0x2A (Unknown)
Display - Network Control S 68 FF 61 XX - - XX:0x03 (Node awaken) o 0x04 (Sleep Node)
Low Voltage Tell-tale S C8 89 61 0E XX - Answer to ECM.
XX:0x03 (Tell-Tale.OFF) o 0x83 (Tell-Tale.ON)
Tell-Tale ON if (0xXX & 0x80)≠0
Low Voltage Tell-Tale S E8 89 61 0E - - I don't understand why this message is beeing sent.
ECU Information R/S byte# Formula
#0 #1 #2 #3 #4 #5
B
O
D
Y

C
O
N
T
Clutch & Neutral S 48 3B 40 XX - - Neutral if (0xXX & 0x20)≠0
Clutch open if (0xXX & 0x80)≠0
Turning lights R 48 DA 40 39 XX - Secondary ID 39-Turning lights
turn signals, 0xXX = 01,02,03 per left/right/both
#2 ??? - Network Control R 29 FE 40 01 - - Secondary ID (01) Unknown
Body Cont - Network Control S 68 FF 40 XX - - XX:0x03 (Node awaken) o 0x04 (Sleep Node)
Low Voltage Tell-Tale R 48 92 40 XX YY ZZ XX,YY,ZZ Unknown
#8 ??? - Vehicle Speed Control R 08 62 40 XX - - XX:0x20 (Unknown)

Project Index:
Part1 / Part2 / Part3 / Part4 / Part5 / Part6 / Part7 / Part8 / Part9 / Part10 / Part11 / Part12 / Part13 / Part14 / Part15

keywords: HD, harley, davidson, tachometer, tacho, rpm, J1850, SAE, VPW, specification, J1850, messages, rpm, gear, ID, header