1995 Vw ABA engine ECU OBD1
68/1 = Brouw & Red - Ground
68/2 = Injector out put
68/5 = Yellow & black - Check engine light
68/6 = yellow & blue -fuel pump relay (switch on)
68/7 = Brouwn & red - ground
68/8 = Black & Red - coil power side
68/9 = Black & brown - ECU relay sig (whitch on)
68/10 = Brown - Ground
68/14 = Blue - Coolant temp
68/15 = Lilac - EGR temp (cal only)
68/16 = Brown & red - MAF
68/17 = Red - MAF
68/20 = white - o2 signal/ground
68/21 = Yellow - OBD check port
68/22 = Green & black - Power
68/23 = Red & blue- Power in from ECU relay
68/24 = Injector out put
68/25 = injector out put
68/26 = injector out put
68/27 = White - IAC
68/28 = white - o2 control unit/relay
68/30 = Green & gray - EGR valve
68/31 = Green & yellow - evap valve
68/33 = Brown - Ground
68/36 = Blue & green - intake air temp
68/37 = Green - AC
68/38 = Black - coil signal side (tack side)
68/39 = Blue - AC
68/40 =Green & white -TPS
68/41 = Black & yellow - TPS
68/42 = Yellow - o2 signal/ground
68/43 = Grey & white = OBD check port
68/44 = White & red - from distributor
68/51 = Lilac & White - ???
68/53 = Black & white - IAC
68/54 = Red & yellow - from distributor
68/55 = Brown & white - Ground
68/56 = Brown & white - Ground
68/58 = White - Ground
68/65 = Blue & white- vehical speed signal form dash
68/67 = Red - crank sensor
68/68 = Green - Crank sensor
Last edited by Abricos on Wed May 27, 2015 4:59 pm, edited 1 time in total.
just checking various ecu connectors and the pinouts: is there any guideline on wiring all those pins, like grouping high-current pins (injectors), grounds, signal pins, etc.
Motronic engine computer for the VR6 (AAA code) and 4 cylinder 2.0 (ABA code) engines. Wiring is substantially similar between all 4 engines, with differences noted below.
Bosch manufactures this system. The OBD1 system is called Motronic M2.9 (M2.9.1 for engines with coil pack), and OBD2 is called Motronic M5.9.
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5A to 8.73A is a thermal limit, and an absolute minimum. As well that's a very high estimate. UL486E puts that around 2 to 3 amps. I see the voltage drop would be about .25V for this short length of wire. As fuel injectors and such turn on and off, it will cause your GND signals to vary which will cause your analog signals to vary as injectors turn on and off.
ignition is HL1 or what ever HL you need. This does not drive the coil directly, you need an ignitor. The HL is for high or low driver. The high side can be configured for 12V or 5V. Your OEM VW coil probably has the ignitor integrated into the coil, but it might not.