Stand-Alone OBD-2 Analyser
Interpret 'trouble codes' without PC
Published in issue 366, June 2007
This handy analyser makes a simple job of rummaging through the information stored by the client–accessible part of your car’s computer. It works with all current OBD-2 protocols and can read and erase trouble codes stored in the vehicle and reset the MIL display. All this without the help of a PC or a visit to a service station.
Resistors
R1 = 1kΩ
R3,R4 = 100kΩ
R5,R9 = 33Ω
R6,R11 = 560Ω
R7,R8 = 100Ω
R12 = 1kΩ5
RN1,RN2 = 10kΩ SIL-10 array
RN3 = 6kΩ8 SIL-8 array
Capacitors
C1,C2,C3,C10 = 100nF
C4,C5 = 22pF
C6,C7 = 470pF
Semiconductors
D1 = 1N4004
D2,D4,D5 = 1N4148
IC1 = 78L08
IC2 = LM339N
IC3 = AT90CAN128 (Atmel; QIL case), programmed as “AGV4900” (Stange Distribution)
IC4 = PCA82C250 (Philips)
IC5 = 7805
LED1 = 3mm, red
LED2 = 3mm, green
Q3-Q6 = BS170 (TO92)
Q7,Q8 = BS250 (TO92)
Miscellaneous
Q1 = 8MHz quartz crystal (HC49/S)
LC-Display 3x16 lines, type EA DOGM163E; with background light: EA LED55X31-A
S1,S3 = PCB mount pushbutton type 40-XX B3F (Omron) with matching aluminium cap
DC buzzer
X2 = 9-way sub-D plug (male), PCB mount
IC socket 14-way
IC socket 8-way
QIL socket (4 segments of 16 pins)
PCB
Case with front panel foil
Mounting materials
Note: Kit of parts no. 070038-71 contains all components, the case (with front panel foil fitted), mounting materials and OBD-2 cable, see Elektor SHOP
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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