Questions tagged [obd]
OBD means "On-Board-Diagnostics" for motor vehicles. Originally proprietary, there are now standards such as OBD-II and EOBD which define the connectors, electrical signalling systems and a standard set of messages.
54
questions
0
votes
0
answers
19
views
OBD2 Pwr+Gnd causes poor GPS reception in device plugged into it, looking for causes & solutions
Myself and a few others have built a custom device (PCB & components) which is designed to run while plugged into an OBD2 connector in a vehicle and capture GPS location data and transmit it via ...
- 273
1
vote
1
answer
265
views
Identify a chip
So I cannot identify this chip by name I am not an electrical engineer I come from IT programming background but I am interested in a wide array of things, so I thought that I might ask you guys since ...
- 29
1
vote
2
answers
3k
views
K-Line vs CAN bus
I'm building an app (running on a Pi) that will communicate with consumer vehicles for diagnostics and control. I assumed that I could achieve this over CAN bus since all vehicles after 2003 are ...
- 139
0
votes
1
answer
119
views
No CANbus response to broadcast
I am trying to create a simple OBD tool in Linux to talk to my car (2009 Honda Accord). My OBD device successfully connects and I see lots of CAN frames arrive. However, when I issue an OBD command (...
- 139
1
vote
4
answers
9k
views
Getting 45.6 Ω when it should be 60 or 120 Ω on CAN bus
We have a 2011 Chrysler 6.1L Hemi SRT. We can not get any diagnostic reading at the DLC or OBDII port. We have checked all the wiring, fuses etc.
Our readings at the DTC connector are as follows: CAN ...
- 19
1
vote
0
answers
76
views
Possible OBD-II/OBD2 connections for development phases [closed]
Is there any paper/document that summarizes all connection scenarios or cases when you are developing an OBD-II/OBD2 project for automative/car electronics?
For instance,
Scenario 1 : Real car -> ...
- 111
0
votes
1
answer
79
views
Can an auto reset fuse and capacitor save my tracking device from surges while keeping it running?
I work with a few tracking devices and the newest model keeps popping. I've narrowed it down to possible short term current spikes in the trucks they are installed on. The device receives power from ...
1
vote
1
answer
492
views
Unable to get identify CAN-H and CAN-L pinout from voltages & resistances measured at OBD-2 port
I am trying to figure out the CAN-H and CAN-L from OBD2 port fixed below the Dashboard. I unable identify CAN-H & CAN-L as I get following inappropriate voltage & resistance values which are ...
- 25
0
votes
1
answer
4k
views
0x7E8 to 0x7FH on the CAN bus?
I am currently trying to understand the working of the CAN bus. I understand that when we connect a CAN bus logger to the OBD2 port in a car we will be able to view the CAN traffic (raw CAN frames) ...
0
votes
0
answers
65
views
STN1110 UART-RX-LED is flashing rapidly
I did a pcb mount for a stn1110 "Multiprotocol OBD to UART Interpreter" and followed exactly schematic from datasheet.
The issue I have is that after is starting, there is a sequence of ...
0
votes
1
answer
790
views
Need help designing an OBD2 sniffer using an STM32 F446RE MCU
I have written a simple program that should send "NO MESSAGE!" to the serial monitor if there are no CAN messages or "A NEW MESSAGE ARRIVED!" and then the CAN message itself ...
- 5
1
vote
1
answer
318
views
Is my use of the L9637 ISO 9141 single-wire transceiver a robust design?
Eventually, I want to tap into the K-line of my Kawasaki Ninja with an (ISO 9141) OBD reader, using an ESP32 WROVER and a L9637 single-wire transceiver. To get there, I'm at the stage of confirming ...
0
votes
1
answer
125
views
Arduino still on after ground disconnected
I am using an Arduino to communicate with an OBD car scanner. It uses 2 digital pins for communication (7 and 11 SoftwareSerial.) I connected 12V power to VIN and GND. I also added ON/OFF switch in ...
- 115
-1
votes
1
answer
220
views
OBD II Female connector with datasheet and measurements
I need an OBD II J1962 female port with 90 degree angled pins for pcb mount.
I am struggling to find a part which has a data sheet or enough info so I can create a pcb footprint for it.
Do you know ...
- 101
1
vote
1
answer
224
views
Some Physical Layers used with OBDII
I need to review some physical layers used in OBDII, a very common interface communication of vehicles and used as interface in a automotive scanners. I don't need exactly to know how the protocol ...
- 917