940 Diagnostic socket (imitation OBDII)

[gpl1968]

Originally Posted by stevieturbo

Have to say though, given the simplicity of the reader, I'm surprised that even Autodata says special equipment is required to read the ABS codes on these cars without the underbonnet DLC connector.
It really gives very little information at all.

If you didn't know how to build your own reader, you would probably have to fork out for such 'specialist equipment' or make an expensive visit to a main stealer.
It could also be true that Autodata doesn't know as much about these cars as we do.
Luckily for us we have the knowlege base on this and other forums.
I only came up with my design thanks to earlier work done by other forum members
Apart from the code reader write-up in the articles section, I found this pdf which indicated that you could also read cruise and abs codes.

Also quite shocked at the simplicity ( or crudeness ) of the injection system fitted to these cars lol

It was good enough to be used on the Porsche 928
I wouldn't call it crude, but simplicity has it's benefits.
The Bosch LH injection is apparently regarded as being robust and reliable, more so than the systems used on the later Volvo models.

That said, LH2.4 has the ability to learn and adapt to differing levels of boost. My lpt is perfectly happy at over double its factory boost setting. I doubt you could do the same with a later V70 without a re-map.

[stevieturbo]

It is crude. Running all injectors off one wire is crude. Using a coil/dizzy arrangement is crude.

Oddly the wiring diagram also indicated a cold start injector....Whilst I havent looked, I'll assume it doesnt actually use one

Every car running air mass metering has a good ability to run most boost than standard. That doesnt mean it is running optimally. But they can all do it.

And I did chuckle when I first stuck a bosot gauge on....mine was only making 3.5psi !! Any wonder it didnt even feel turbocharged.

Whilst I know the online write up indicates you can push an LPT to around 10psi, I would tread carefully there.
Even on mine at 9psi I could audibly hear detonation in the cabin on 95RON fuel. If I can hear it there, it is already quite severe.

Havent yet stuck proper detonation detection devices on or a wideband though to see where the onset of detonation actually occurs on mine.

Whilst it is crude, on the std car it does drive very well and smoothly, so it is still effective. But on a car of 1998 vintage...it is still old tech.

[TonyS9]

Originally Posted by stegreg

My reader checks for both obd1 AND 2 versions.
YES I have tried it on my 1995 940 and YES it reads for fault codes, but as yet, my own car has no fault codes for me to read...........................

i am unable to let you know name of ready at moment, as a freind has borrowed it to read their own car fault codes.
I admit it was purchased from a company in hong kong, but dont knock them, as what does not have a foreign circuit board in these days, as who needs to really pay for a designer label on a working piece of kit?

the only thing I found it would not do, was reset service lights, thats all,but being as my cars ive owned dont have need for this, it hasnt been a problem.

My reader (Auto Enginuity), and most other readers also do this, but the 940 does not do OBD1 or 2 either. The reader should be able to read sensor data but the only things my reader was able to get was the voltage at the socket.

The only ones I have seen that work with the 940 are specialist 1 off's or led flasher units like the above. I suspect the specialist ones are just reading the flashing pulses anyway.

You must have an 96 model. My 95 does not have the socket, but the 96 does. I think it was added then for US market, but failed to meet the requirements and you don't get 940s after 95 in the US.

[vlovo]

Originally Posted by gpl1968

Yes the push button starts the process. It works in the same way as with the OBD box that was in the engine bay of earlier 940s. Just follow the instructions in the FAQ.

I believe it has to be an LED to make the circuit work as it only allows current to flow in one direction (I suppose you could use a bulb and an appropriately rated diode, but that would be even more complex).
if you get a 12v rated LED you are also saved the task of adding resistors in series to protest the LED.

I made a parts list for an earlier posing. If it helps here it is:

Maplin
Small Narrow Box-------FT31J----£1.59
Rotary SW12B----------FF73Q----£1.79
Grn Mom Push Switch---N02AR----£1.99
12V Orn Plas Pan LED---N03BB----£2.19
Multi-Core 9-Way-------XR27E----£2.54
Knob RN15 Red---------FE76H----£0.79
Open Grommet 0705----QT93B----£1.79

ECUfix.com
OBDII Plug--------J1962 16-Pin Male----£2.49
Delivery--------------------------------£3.50 approx

Apart from the OBDII plug, which I found online, The rest of the parts came from Maplin.
I just found a shop assistant and we went through my rough list. My final choice was dictated by what was in stock as mush as aesthetics.
I could probably have used cheaper components and got a similar result.

This looks interesting.
Any idea where the connector is located within the car.
I have a P reg (1996/7) 940 LPT estate and It 's showing the ABS warning.
Normally the car is a dream.

[gpl1968]

Originally Posted by vlovo

This looks interesting.
Any idea where the connector is located within the car.
I have a P reg (1996/7) 940 LPT estate and It 's showing the ABS warning.
Normally the car is a dream.

The socket is in the centre arm rest under a cover:

[TonyS9]

I had an ABS problem on a 323i , in the end I just tested the sensors with a meter. The faulty one was OC. Anything else you probably need to swap out the ABS module.

Never had any need for a code reader on any of my cars, but I did use the Autoenginuity on a friends Ford, on which basic stuff like coils break... lol

On the Volvo, the sensor tips do seem to get corroded alot (long life car) so check the visible condition first, then pull the plugs off and check the sensors are still in circuit with a resistance check.

[nampramos]

Is someone able to tell me if this OBDII port on the arm rest of the 940 (I have the 1998 945 Classic, manufactured 97) could be used with a ELM327 WIFI OBDII reader that is on sale on eBay and is used to send data to smartphones over wifi?

Cheers!

[popuptoaster]

Originally Posted by stevieturbo

It is crude. Running all injectors off one wire is crude. Using a coil/dizzy arrangement is crude.

That may be crude but it's cheap and easy to fix if it ever goes wrong, and Volvo had newer models already in production and waiting in the wings so why would you update the 940?

It doesn't matter how sophisticated you make the ignition/injection system if its still got a 50 year old 8v four banger powering it.

As has been pointed out there are very few family saloons, especially of the 940's age, that use an ECU that can adjust the maps for much higher boost levels than stock and higher octane fuel all by themselves, that's normally the preserve of high performance cars.

Complication for complications sake it annoying and pointless, if a simple solution works then keep using it I reckon, I like to laugh at my mates when they have to buy new and expensive coil packs and such like on their more "modern" cars that seem to break on a regular basis.

[popuptoaster]

Originally Posted by nampramos

Is someone able to tell me if this OBDII port on the arm rest of the 940 (I have the 1998 945 Classic, manufactured 97) could be used with a ELM327 WIFI OBDII reader that is on sale on eBay and is used to send data to smartphones over wifi?

Cheers!

No it can't, I have one and "Torque Pro" on my Galaxy Note 2 and it wont talk to the ECU, they only work for OBD 2 cars, will read my mates Skoda VRS just fine but its completely dead in the Volvo.

[nampramos]

Originally Posted by popuptoaster

No it can't, I have one and "Torque Pro" on my Galaxy Note 2 and it wont talk to the ECU, they only work for OBD 2 cars, will read my mates Skoda VRS just fine but its completely dead in the Volvo.

That's a real pity! I guess the protocol ISO being used is different. So there's no adapter or any "software upadte" that will make this possible, right?