PRESENTATIO
N ON DTC
By- MALAY
06-06-2023
ABOUT DTC
DTC codes help you understand what needs
to be fixed so you can keep your vehicle
operational and safe.
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W H AT I S D T C ?
A DTC code is a series of diagnostic
trouble codes used by a vehicle’s
onboard diagnostics (OBD) system to
alert you when a vehicle experiences a
malfunction. Different codes have
different DTC meanings and represent
specific problems in your vehicle.
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HOW DOES DTC
WORKS?
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Detection
Generating DTC
Tr a n s m i s s i o n
Storing
Vehicle’s electronic
Generates a specific
Transmits the alert to
Problem is recorded
system detects a
DTC code
the vehicle’s instrument
as a code in the
panel as a warning
NVM.
problem
light.
OBD-I
OBD1 is the On-board Diagnostics standard applied to vehicles made for California from
1991 to control vehicle emissions in this state. All cars marketed for this area had to be
equipped with OBD1 to detect engine issues and report trouble codes.
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OBD-II
The OBD2 connector lets you access data from your car easily.
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W H AT I N F O R M AT I O N C A N O B D 2
P R O V I D E A N D I T I S U S E D F O R W H AT ?
It provides information about a vehicle’s coolant, air temperature, road speed,
position, throttle crankshaft, and camshaft, plus the engine rpm and, most
important aspect, the problems that your car has.
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A FEW THINGS TO NOTE:
•T h e O B D 2 c o n n e c t o r i s n e a r y o u r s t e e r i n g w h e e l , b u t m a y b e h i d d e n b e h i n d
cover s/panels
•P i n 16 s u p p l i e s b a t t e r y p o w e r ( o f t e n w h i l e t h e i g n i t i o n i s o f f )
•T h e O B D 2 p i n o u t d e p e n d s o n t h e c o m m u n i c a t i o n p r o t o c o l
•T h e m o s t c o m m o n p r o t o c o l i s C A N ( v i a I S O 1576 5 ) , m e a n i n g t h a t p i n s 6 ( C A N - H ) a n d 14
(CAN-L) will typically be connected
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LINK BETWEEN OBD2
AND CAN BUS
On board diagnostics, OBD2, is a 'higher layer protocol. CAN is a method for
communication.
They both use identical connectors, J1962.
DIFFERENCES BETWEEN OBD2
AND CAN BUS
A CAN BUS IS
A PROTOCOL
OBD 2 IS A
LANGUAGE
USED FOR
DIAGNOSTIC
FUNCTIONS.
CAN BUS IS A
HIGH-SPEED
COMMUNICATIO
NS PROTOCOL
OBD2 IS A SLOW
WAY OF
READING DATA
ON A DIGITAL
SCREEN.
UNLIKE OBD2,
THE CAN
DEVICES
BROADCAST TO
THE NETWORK
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HOW TO LOG OBD2
D ATA ?
•) W E C A N C O N N E C T A N O B D 2 L O G G E R T O T H E O B D 2 C O N N E C T O R
•) U S I N G T H E T O O L , W E S E N D ' R E Q U E S T F R A M E S ' V I A C A N
•) T H E R E L E V A N T E C U ’ S S E N D ' R E S P O N S E F R A M E S ' V I A C A N
•) D E C O D E T H E R A W O B D 2 R E S P O N S E S V I A E . G . A N O B D 2 D B C
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A D VA N TA G E S O F H AV I N G D T C ’ S
• EAR LY D ETEC TION OF FAU LT AN D C AU SE
• EF F IC IEN T AN D EF F EC T IVE T R O U BL ESHOOT IN G
• R ED U C ED C O ST TO C O M PAN Y AN D C U STO M ER
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THANK YOU
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MALAY
S2 Technology India