Hi Folks,

Does a 94 945 hookup to OBD-II for emissions readings?

I need to get my 945 to pass NY inspection.
Have an errant EGR code tripping the CEL. Cleaned the EGR with no joy, and need to search out the fault.

Could the 94 pulse air system be an issue?
Amy tips on the pulse air system?

Temp sensor?

Thanks,
Bert

FYI: The car passed NY inspection yesterday.

I swapped in a new EGR temp sensor and that cleared the OBD codes.

No OBD-II emissions testing.

The inspecting mechanic was happy to see the stainless brake lines.

Thanks to all who chimed in.

Bert

Dear Mr, Nabisco,

Hope you're well. OBD II is not present on 940s sold in North American markets.

Have you tried to clear the Code by disconnecting the negative battery cable clamp from the negative battery terminal, waiting 15 minutes, and then re-connecting? This usually clears a code. Be sure to have your radio security code, as cutting power to the entire car will require use of the code to re-activate the radio.

Hope this helps.

Yours faithfully,

Spook

Hiya Mr. Nabisco and Uncle Spook,

As Uncle Spook says ...

So, Mr. Nabisco, your 1994 Volvo 945 has an M47 II in it? Or some manner of manual transmission? I'll guess, then, it is a normally-aspirated (non turbo) 1994 Volvo 945? As you mention you found the noise as the 02 sensor cable was contacting the giubo flex coupler to make knocking sound from tranny area. (I hope the cable sheath and entire 02 cable assembly remains undamaged!)

An intermittent fault of the EGR would be the:
- Vacuum pump (power to it when the ECU powers it to pull a vacuum on the EGR valve, the little filter is clogged, or another fault such as vacuum pump failure as the teeny-tiny motor can seize from lack of lube [mobile 1 helps])
- The EGR Valve fails to open or remains open too long (Yep, measured by a temp threshold and duration of that threshold, the EGR valve is failing, vacuum controlled diaphragm does not hold a vacuum to open for exhaust flow, or valve action is hindered as exhaust combustion products have condensated around the valve inside the exhaust gas route and valve piping)
- Temp sensor is failing, though dunno how to test. Multimeter, yet know not the tolerances.
- Combustion product condensation at any point along the EGR exhaust vapor path. The further away from the exhaust manifold, the more likely condensation, or carbonization, can form. If using mineral oil, auto car use is typically short trips, or a long interval between ERG servicing, or overly long interval between oil changes.

With info to back probe the ECU connector to check the EGR temp sensor (though there are two types):

https://volvoforums.com/forum/volvo-240-740-940-12/95-940-rough-start-72453/

It used to be on the k-jet equipped 240 an EGR service light appeared on the dash at like every 30k or 45k miles.

What I've found, usually, is carbon build up in the pipe downstream of the EGR valve. You can remove the two retaining machine screw that secures the EGR pipe to the intake port manifold, and you may find blockage, like atherosclerosis, from too much blue cheese and buy one, get one free cheeseburger coupons.



You can disconnect the vacuum line that goes to the EGR valve at the vacuum pump end. Use a handheld vacuum pump and check the action of it under the intake port manifold. I merely suck on the far end of the EGR valve vacuum line to check for leak and see there is a distinct action that comes to a stop. The EGR valve, however, can rarely grenade to an open position, yet all piping is clear.

The EGR exhaust gas piping is sealed using collets that compress under the EGR piping hardware.

So, you have the Pulsair, also? The PulsAIR (dunno how it is stylized) is a passive injection of ambient air between the exhaust pulses out fo the engine at the cylinder head exhaust port. A (relative) vacuum sucks some air in. I believe, yet am not sure, as it's been now some years I'd looked at the system. There is a vacuum pump, like that used with the EGR, yet it is pumping air in, I believe. Yet am unsure. I'm unsure if

Do you can clear codes disconnecting the battery as Spook indicates and as in the FAQ or your service manual for doing so.

https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm

Pulsair Revisited 900:
https://www.brickboard.com/RWD/volvo/699560/940/960/980/V90/S90/pulsair_revisited.html

I doubt NY-state allows you to do this:
740 B230K Pulsair - REMOVAL - Volvo Owners Club Forum
http://www.volvoforums.org.uk/showthread.php?t=2881



Yet if it sets the code again for an EGR fault after you cleared the codes, there may be a fault in the EGR system. Yet the EGR fault codes do not indicate much beyond whether there is a fault. Use socket 2 (fuel injection, emissions) and socket 6 (ignition, emissions). Both ECUs are a different part numberfrom a non-EGR ECU when EGR-equipped. Both the fuel and ignition EGR interact with the EGR system.

Questions?

Hope that helps.

MacDuffed.
--
Give your brickboard.com a big thumbs up! Way up! - Roger Ebert.

Thanks for the responses.

FYI: The car in questions is a 94 945 auto AW71 non-turbo.
My 245 has the M47.

I have cleared the code several times and 4-1-3 comes back, even after cleaning the EGR itself.

I don't have the car in front of me, but will be working on it this weekend. So I am not positive that it has the pulse air system. Will look for it.

I have been told by two people that my 94 940 will have an OBD reader near the fuse box used for emissions inspection. ??? I'll look for it this weekend.

I plan on swapping in a new EGR temp sensor and seeing if that stops the OBD code. If not then I guess I'm looking at a pipe clog or vacuum pump issue.

Another question... I do not remember any wire to a temp sensor when I removed and cleaned the EGR, and the temp sensor location is not clear in the diagrams. Is it hard to replace?

Bert

The OBD question is an interesting one. Here is why. My 95 855 has both OBD l and OBD 11. When I bought the car I thought it only had the OBD 1 as in my 240. The 850 OBD 1 has 3 readout boxes under the hood (engine, tranny and ABS). Pretty useful and simple analysis tool.

This is where it gets interesting. After owning the car for awhile I discovered there is an OBD 11 readout socket mounted in front of the shifter in the center console. Well hidden little sucker! Same spot Kitty mentioned it is in 96+ RWD Volvos. That is also the same spot for 96+ FWD Volvos. Logical.

AFAIK, the 95 850's are the only Volvo that has both OBD's. Let's take this to the next step: Wouldn't it be possible that 95 940's and 960's have OBD 1 and OBD 11 units onboard as in the 850? And perhaps some 94 Volvo's have some sort of secondary OBD readout socket as Bert mentioned even it isn't a full blown OBD 11??

Hi Mr. Nabisco!

Happy Friday to you! Hope all's aces!

Thank you for the wheat thins!

Sorry for my very tardy reply.

I guess your NY-state emission due date is quite near?

Also, there is another question, yet from CA-state, to which Phil machine man replied.

Sorry for my transmission mix-up. To have a 940 non-turbo or turbo with manual transmission would be really nifty.

The FAQ and your EGR:
https://www.brickboard.com/FAQ/700-900/EngineSensors.htm#EGRValve



You mean an OBD reader socket? At the fuse box behind the center console ashtray? Welp, I'm inclined to agree with Uncle spook in that the Volvo autos In North America up to 1995 do not have OBD-II with the socket or port for connection to an OBD-II code scanner. OBD-II, with the OBD-II socket, or port, scanner, is at the center console on 1996+ RWD models. The FAQ page describes OBD-II data port location as "in front of the shifter in the console."

So you have Bosch Motronic or the Bendix Regina (fuel) / Rex (ignition) as you have OBD-1 LED blinky box A socket 2 (fuel injection, emissions) fault code of 4-1-3.

Have you tested for fault codes on the A-box, socket 6 (EZK ignition, Bendix Rex ignition). For both the fuel control and ignition control both make use of and control the EGR. So, do you get a fault code of 4-1-3 at socket 6, also?

If yes, fault code for EGR temp sensor at both locations, may mean clogged EGR piping that may still require cleaning, the vacuum solenoid is faulty or clogged (pop the cap off, the foam filter has disintegrated and clogged the little EGR solenoid vacuum pump), the wiring between the EGR Temp sensor to the wire harness both ECUs if both report the ECU temp sensor fault.

If only one ECU presents EGR temp sensor fault code, I'd suspect the wiring, including all connectors, between the temp sensor and the ECU reporting the offending fault code. DeoxIT.

I'd encountered the EGR temp sensor in two locations:
- near the middle of the EGR piping down stream of the vacuum controlled EGR valve under the air intake port manifold. We have images from my sold in Germany 1991 240 sedan:





- (Most likely for you and your 1994 Volvo 940 with awesome B230) On the EGR valve body itself downstream of the valve and on the side opposite of, or at right angle to, the receiving thread that connects to the piping that connected between the EGR valve and the air intake port. We have some i-net stock images for you.


(From: https://volvoforums.com/forum/volvo-240-740-940-12/how-take-egr-valve-off-740-turbo-63487/)

Though I've encountered EGR systems without a temp sensor at these locations. Or, rather, I could not find it.

Have you found your EGR temp sensor, then?

Here are some images of PulsAIR equipped RWD Volvos look like:


The PulsAIR valve assembly. From:
https://www.brickboard.com/FAQ/700-900/EngineSensors.htm#PulsairValve

The FAQ indicate PulsAIR and EGR operate independently.

Does that help, I hope.

Questions?

Hope that helps.

Friday MacDuffed.
--
Give your brickboard.com a big thumbs up! Way up! - Roger Ebert.

Thanks again for more great info!

I'm getting eyes on my 945 tomorrow and I'll see what I can see...
I'll swap the temp sensor if I see/find one.

I wish I had a 945 with an M47! I've got two 94 945s now, and I'm really growing to like them. Still love my hot rod 245 M47, but I'm getting used to the slightly higher ride height of the 945 and an auto tranny really is easier in city traffic.

I'll report about what I find, mainly if I find an OBD port near the fuse box.

Bert