Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [obd]

An acronym; On Board Diagnostics.

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What is the point of performing an OBD2 diagnostic scan if there is no malfunction indicator?

Where I live, it is common for car mechanics to help their customers who are planning to purchase a new used car by performing an OBD2 diagnostic test on the car in question, even if there are no dashboard warning lights. What is the point of this?…
hb20007
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Horsepower at wheels calculation

I have used Torque Pro App for sometime in my Hyundai i10 Era (2011 model) and it gives me Horsepower at wheels. But the values seems to be much less. To find out the problem, I logged the car OBD speed using Torque Pro app, calculated the Hp at…
Soumya Sen
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On Board Diagnostics-II for Electric Vehicles

I'm learning about OBDII, and I'm wondering whether it is valid on EV's too. According to Wikipedia's PIDs article, the Service 01 PID 51 (or Fuel Type) has a value 8 that means that the fuel type of the vehicle is Electric. However, it seems that…
Nameless
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How useful is a low-end corded OBD-II reader for inspecting a used car?

I purchased a low-end OBD-II reader from Wal-Mart a few months ago. Now I'm in the market to purchase a used car and I was wondering how useful the reader will be when I go to look at the vehicle. Of course I plan to test drive the vehicle but I was…
Mowzer
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About heavy-duty vehicle diagnostic port

I am trying to design an ELD device that could be connected to the deutsche 9 pin and 6 pin port on heavy-duty vehicles. Is there any place where I can get the pinout configuration of these ports for different brands? I am looking for the pinout…
Adnan
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Relation of VIN of a car with emission norms of a country it is sold

A VIN of a car determines the country of manufacture. So if a car has a VIN of Canada (CARB emission standard) and is sold in India (BS-IV emission standard), will the car comply with BS-IV standards? Since the VIN is of Canada, don't that mean the…
Soumya Sen
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What is Honda HDS HIM?

I've been trying to find inexpensive PC based ways to connect to the older Honda's which use the 3-pin OBD connectors. I have run across a package being sold in various places called Honda HDS HIM. I was wondering if anyone knows what this is / has…
Robert S. Barnes
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Difference between FMS and OBD

What is the difference between FMS and OBD. Whether OBD is a standard or protocol. Recently I am working on a GPS device to tap the CAN bus in order to integrate with our fleet management system. In configuration I found two options: FMS and OBD,…
Dineshkumar
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Retrieving handbrake status light and reverse light from OBD II

I have a project to replace my car's instrument panel with a Android tablet. So I'm developing an application that communicates with an ELM327 device through bluetooth. I have managed to successfully get things like engine RPM, speed and temperature…
rafaame
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Mode 02 - Freeze frame data use

I got some data on sending 0202 command (Mode $02, PID 02). It is the freeze frame data. I don't understand why does anyone need the data? Do anyone (including mechanics) ever open Freeze frame data? What will one do knowing that when MIL appeared,…
Soumya Sen
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OBD-II Mode and PIDs specifically used for Electric vehicles?

I am working on developing a vehicle CAN communications protocol being implemented in an electric vehicle. I was wondering if anyone knew if there is a standard MODE and PID for OBD-II messages transmitted over CANbus on pure electric vehicles…
RaaziR
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OBD or CAN - what's mandatory (EU and US)

First of all, I've already tried to do my research and tried to get all the info I'm asking for myself (which obviously didn't work). I want to know if CAN or OBD(-II) are in fact mandatory in the US and/or EU and where I can find proof for that. I…
Peter
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OBD MIL commanded status and DTC stored

OBD-II Mode 01 PID 0 gives commanded MIL on (bit A7, see link) and Number of confirmed emissions-related DTCs (bit A6-A0, see link). I did hit Mode 01 PID 01 on a few cars but got surprising results. In Skoda Superb, there was no visible Check…
Soumya Sen
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CAN data for Mahindra

I bought a new Mahindra Scorpio S10 and have been trying to read the CAN bus using ELM 327 Bluetooth OBD and Putty. Configurations in Putty: Baud Rate 9600 (tried 115200 also), Data bits: 10, Stop bits: 1 I have been getting data for mode 01 and…
Soumya Sen
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How does OBD2 work with CAN?

I understand how CAN works (I think). Good info here if you would like to see: Difference between OBDII and CAN So very briefly, there are multiple modules and each module posts interesting data on the wires. Every module gets the data, it then…
av4625
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