OBD-2 universal cable scheme for PWM, VPW, and ISO 9141-2 vehicles pinout |
connector or cable wiring scheme |
16 pin car OBD2 special connector | This device is a CMOS microcontroller which is designed to interface a personal computer or laptop with a vehicle's On Board Diagnostic (OBD II) interface. It is intended to function with all three of the protocols used by vehicle manufacturers to implement the OBD II system as defined by SAE and ISO specifications. The OBD II system became mandatory for 1996 and up vehicles, but some vehicles were already fully or partially compatible with OBD II requirements prior to 1996. The chip is not suitable for the earlier vehicles such as OBD I. The device is intended to function as a simple scan tool and is capable of sending and receiving any OBD II message defined in SAE J1979 for any of the three types of OBDII bus implementations (PWM, VPW, ISO 9141-2). It can also be used as an inexpensive interface for custom instrumentation monitoring various vehicle parameters such as speed, RPM, coolant or intake air temperature, engine load, intake air flow rate, etc. Components: C5, C6 .01 UF, 25V C4 .1 UF, 25V C3 .47 UF, 50V C2,C1 20 pf, 50V R11, R12, R23, R9, R1, R3, R4, R25, R8 10 KOhm, 1/4 Watt R24 18 KOhm, 1/4 W R19, R18, R7, R20, R22, R5, R6, R13 1 KOhm, 1/4 W R21 5.6 KOhm, 1/4 W R16, R17 510 Ohm, 1/4 W R10 62 KOhm, 1/4 W R15 9.1 KOhm, 1/4 W R14 270 Ohm, 1/2 W R2 - Not used D2 1N4739 Zener, 9.1V, 1W D1, D3 1N4148 Diode Q3, Q4, Q5 PN2222 Transistor, NPN Q2 PN3904 Transistor, NPN Q1 PN3906 Transistor, PNP IC2 7805 Regulator, 5V IC3 LM339N Quad Comparator IC1 16F84-20 Microprocessor (firmware 1.07) XTL 1 20 MHz Crystal, 20 Mhz If you don't use PWM, you can omit R4, R6, R7, R8, R9, R10, Q1, Q2, D1. Don't connect external power sources - all power direved from pin 16 of OBDII Serial port works at 19200 baud
| ||
Pinouts.ru > Cars and bikes interfaces > Pinout of OBD-2 universal cable scheme for PWM, VPW, and ISO 9141-2 vehicles and layout of 16 pin car OBD2 special connector |
may be incorrect | |
Source(s) of this and additional information: OBD II Interface Chip Data Sheet | 2 reports | |
Last updated at Fri Jan 11 2008. Submit additions or corrections for this document. | Is this document correct or incorrect? What is your opinion? |