ODB1 Pinout for Volo Chip
Guys.
I contacted the Volo Chip guys to check if I can connect to my 1994 Disco 1 the chip and they requested me the pinout of the OBD 1 connector in order to check if it can be done. Have googled, but got nothing. Anyone can help? Thanks! |
Originally Posted by johnkbl
(Post 211653)
Guys.
I contacted the Volo Chip guys to check if I can connect to my 1994 Disco 1 the chip and they requested me the pinout of the OBD 1 connector in order to check if it can be done. Have googled, but got nothing. Anyone can help? Thanks! After you unplug the connection and when you remove the rubber boot from the wires simply slide it off the plug and down the wires a few inches. Do not remove the boot. Once the boot is out of the way look closely at the back of the plug and you will see numbers on the left side of the plug. These are the pin numbers... Pins 1 to 13 Left to Right 1 Red/Green Idle bypass valve - circuit 1 2 Brown/Orange Power feed to the fuel injection main relay 3 Yellow Throttle position sensor output/reference - see also 20 and 25 4 Black Oxygen sensors (ground) and to the relay that powers their heater coils 5 Grey/Black Tune resistor (through VIN LA451517 only) 6 Yellow Road speed input 7 Green/Blue Coolant temperature sensor (input) - see also 25 8 Purple/Yellow Windshield defroster input, if fitted 9 White/Light Green Diagnostic connector output 10 Black/Yellow "Check Engine" lamp 11 Yellow/White Right bank of injectors - cylinders 2, 4, 6 and 8 12 Blue/Red Main relay "request" 13 Yellow/Blue Left bank of injectors - cylinders 1, 3, 5 and 7 Pins 14 to 27 Left to Right 14 Black Ground 15 Brown "Battery" supply 16 Blue/Purple Fuel pump relay "request" 17 Grey/Yellow Purge control valve output 18 White/Pink Diagnostic connector output 19 White/Grey "Ignition" supply 20 Red Throttle position sensor (input) - see also 3 and 25 21 Yellow/Black Air conditioning thermostat input, if fitted 22 Blue/Red Air flow sensor (input) - see also 25 23 Blue Signal from the LH oxygen sensor 24 Blue Signal from the RH oxygen sensor 25 Red/Black Ground side of coolant, fuel, airflow & throttle-position sensors 26 Green/White Idle bypass valve - circuit 1 27 Black/Grey Ground Pins 28 to 40 Left to Right 28 Blue/Grey Idle bypass valve - circuit 2 29 Orange Idle bypass valve - circuit 2 30 Black Fault display data 31 Black/Green Diagnostic connector request input 32 Grey/White Fuel temperature sensor (input) - see also 25 33 Black/Grey Air conditioning compressor clutch relay, if fitted 34 Orange/Black Transmission gear switch signal 35 Blue/Green Air flow sensor (input) - see also 25 36 Black/Green Air conditioning condenser fan output, if fitted 37 (Not Used) 38 Brown/Black Fault display data 39 White/Black Engine speed signal cable (harness includes 6.8k ohm resistor) 40 Black Ground I do hope this helps you out. The main chip in the ECM is an EPROM... it is reprogramable or you can simply switch it out for a remapped one. May I ask why you are doing this? |
Cosmo,
Do you know if the EPROM is soldered in or if it just pushes in Larry Not that I'll be replacing my EPROM or remapping my truck, because I like it the way it is, but, I'm just wondering. |
on the cusp
'94 was the year they stopped soldering them in. For NAS Disco's they were all removable and programable. As far as I am aware Rover / Lucas stopped soldering the chips in place when they switched from the 14CU to the next generation ECM.
Honestly, the remap with th 3.9 in this truck is far more effort than it is worth. Now, if you squeezed that 3.9 V8 into a MG, Triumph, TVR etc... then it would be worth it. |
Thanks for the pinout...
Well.... Actually I need the pinout of the OBD1 connector. The Volo chip remaps the ecu every time you start the engine. What I am trying to do is to get more MPG. Thanks! |
I'm assuming you've done the basics?
-new plugs -new air filter -new fuel filter -(if it's a 95) new cap and rotor -new plug wires -premium fuel -proper air pressure in your tires -drive line operating as smooth as possible so, they are making an obd2 piece work for your obd1 truck? the obd2 trucks do not have a distributor. they have a crank fired ignition. I don't think they'll be able to make this piece work. |
Originally Posted by johnkbl
(Post 211694)
Thanks for the pinout...
Well.... Actually I need the pinout of the OBD1 connector. The Volo chip remaps the ecu every time you start the engine. What I am trying to do is to get more MPG. Thanks! If they lean out the fuel map in mid-range rpm's you'll simply lose power. Maybe try ignition tune up first? If fuel economy is your goal this may not be the right vehicle... Your Disco came programmed with a mean air/fuel mix of about 14.7 :1 during normal revs (closed loop). This ratio does change somewhat of course when you floor it or let off the skinny pedal. You could go up to 16:1 but I guess it would be like driving an underpowered RV. :eek: Please let us know if you have this done. |
The real deal if you're serious...
I figured I'd just throw this out there. If you're serious about EFI mods... start here. http://www.microsquirt.info/index.htm
Megasquirt and Microsquirt are good options... |
Originally Posted by johnkbl
(Post 211694)
Thanks for the pinout...
Well.... Actually I need the pinout of the OBD1 connector. The Volo chip remaps the ecu every time you start the engine. What I am trying to do is to get more MPG. Thanks! pins 9, 18, 31, 38 Also, so you know the only way to reprogram the chip (remap) is to remove the chip or replace it. the Data link plug is a one way (output) deal as far as air:fuel mix settings. |
I will be looking into megsquirt/microsquirt with my upcoming supercharger install....
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