How to make the SAS emissions test run?

[wrybread]

Ive been battling my evap system for a good couple months at this point, every time I think I finally have it I get the dreaded "pending fault gross leak". I'm really late on registration so trying to do whatever I can to get through smog check.

Does anyone know:

- how to get the SAS test to run? Currently it passes right when my evap test finally triggers the check engine light. If I could get it to pass a little sooner I can probably squeak through the test.

- will all tests other than evap run with a full tank of gas? And to confirm, evap won't?

[aeg]

If you run the drive cycle from bulletin 25-19, they say that SAS will be tested at step 4 and EVAP will be tested at step 6. It sounds like you're getting unlucky and it meets the conditions to test the EVAP earlier. The bulletin also says to switch off your air conditioning because it can prevent EVAP testing -- so I'd do the opposite, turn on the air conditioning and crank the temperature down all the way. If you know someone with a VST, it should be possible to just run the SAS test by selecting M4.4->DIAGNOSTIC TEST->ACTIVATION->ACTIVATE DIAG->SAS DIAGNOSIS. Maybe it's also possible with VIDA?

[abscate]

SAS should test on a cold start, whereas Evap need to be at idle for 60 seconds or so.

Have you tried cold start, idle for 3 minutes , then drive away and keep car moving?

I’ve kept Evap monitor not ready for 1000 miles or more with tank over 3/4 full

[xanthefin]

SAS should test on a cold start, whereas Evap need to be at idle for 60 seconds or so.

Have you tried cold start, idle for 3 minutes , then drive away and keep car moving?

I’ve kept Evap monitor not ready for 1000 miles or more with tank over 3/4 full

1996-1998 models

...
-Flywheel adaptation must be completed before diagnostics can run
-In order to insure EVAP leakage detection completion, the fuel level in the car should be above 1/4 and below 3/4 tank and A/C off.
-Engine temperature at start must be between + 29°C (84°F) to + 49°C (122°F). If not start engine to warm up over + 29°and then restart engine.
...

Source: Volvo TSB2230056 (old), TNN25-19 (new)

The rest of requirements can be read from the mentioned sources how they made it if it helps achieve the goal.

If you run the drive cycle from bulletin 25-19, they say that SAS will be tested at step 4 and EVAP will be tested at step 6. It sounds like you're getting unlucky and it meets the conditions to test the EVAP earlier. The bulletin also says to switch off your air conditioning because it can prevent EVAP testing -- so I'd do the opposite, turn on the air conditioning and crank the temperature down all the way. If you know someone with a VST, it should be possible to just run the SAS test by selecting M4.4->DIAGNOSTIC TEST->ACTIVATION->ACTIVATE DIAG->SAS DIAGNOSIS. Maybe it's also possible with VIDA?

My interest just did peak of this information.. gonna go play on bench.

[xanthefin]

Poking ice.. Anyone with VST or its V70 manual? I found many which i only know 3 name but i need to know what Volvo called rest if they did ever equid on VST.

[aeg]

Poking ice.. Anyone with VST or its V70 manual? I found many which i only know 3 name but i need to know what Volvo called rest if they did ever equid on VST.

Did you find the SAS diagnosis command? Was it in service 0xB0 or somewhere else?

Neither the VST Green Book nor the Motronic M4.4 Green Book covers the ACTIVATE DIAG menu. They only describe the ACTIVATE COMP menu (injectors, fan, etc). The Autodiagnos manual lists the three ACTIVATE DIAG options: SAS DIAGNOSIS, LEAKAGE DIAGNOSIS, EVAP DIAGNOSIS.

But, I did find a more detailed procedure in VADIS for running the SAS test with a VST:

Verification
After a repair it is necessary to check that the system is working correctly.
-Ignition on.
-Delete the diagnostic trouble codes.
-Drive the engine until it is warm (over 70° C).
-AC off.
-Gear selector in position P or N.
-Let the engine idle.
-Enter the menu for activation of diagnostics. Select SLS Diagnostics [sic].
-Wait until the diagnostics is finished. It may take up to 2 minutes.
-Read trouble codes.
Note! If the texts START CONDITIONS NOT FULFILLED or DIAGNOSTICS ABORTED the diagnostics is not possible.
This could have several causes: the Lambda integrator could be unstable, Lambda adaption is active, engine temperature above 103° C, or that a trouble code has been registered after activation of diagnostics.
Check that there are no trouble codes, start the engine, and then try to activate the diagnostics function again. Sometimes several attempts may be necessary to complete the diagnostics.
Does diagnostic code return?
No
-The vehicle is OK.

[aeg]

SAS should test on a cold start, whereas Evap need to be at idle for 60 seconds or so.

SAS will activate on a cold start but I think it needs to be warm and idling to test. At a cold start the SAS is running, but with the cat cold and the fuel management open-loop, the car has no way of knowing if it's having any effect.

[abscate]

It looks for the voltage drop on the rear O2 sensor from excess O2 being pumped in by the pump. When you do the famous diode bypass, you electronically build that voltage drop in. Lucky for us, th test doesn’t look for voltage before and after the test , just during pump operation

[xanthefin]

Poking ice.. Anyone with VST or its V70 manual? I found many which i only know 3 name but i need to know what Volvo called rest if they did ever equid on VST.

Did you find the SAS diagnosis command? Was it in service 0xB0 or somewhere else?

Neither the VST Green Book nor the Motronic M4.4 Green Book covers the ACTIVATE DIAG menu. They only describe the ACTIVATE COMP menu (injectors, fan, etc). The Autodiagnos manual lists the three ACTIVATE DIAG options: SAS DIAGNOSIS, LEAKAGE DIAGNOSIS, EVAP DIAGNOSIS.

But, I did find a more detailed procedure in VADIS for running the SAS test with a VST:

Verification
After a repair it is necessary to check that the system is working correctly.
-Ignition on.
-Delete the diagnostic trouble codes.
-Drive the engine until it is warm (over 70° C).
-AC off.
-Gear selector in position P or N.
-Let the engine idle.
-Enter the menu for activation of diagnostics. Select SLS Diagnostics [sic].
-Wait until the diagnostics is finished. It may take up to 2 minutes.
-Read trouble codes.
Note! If the texts START CONDITIONS NOT FULFILLED or DIAGNOSTICS ABORTED the diagnostics is not possible.
This could have several causes: the Lambda integrator could be unstable, Lambda adaption is active, engine temperature above 103° C, or that a trouble code has been registered after activation of diagnostics.
Check that there are no trouble codes, start the engine, and then try to activate the diagnostics function again. Sometimes several attempts may be necessary to complete the diagnostics.
Does diagnostic code return?
No
-The vehicle is OK.

Thanks for quoting what possible there is but i have like 3 more what listed so i need verify first... I see them activating for moment something in memory but my M4.4 is playing dead as per functions as its not connected to car. I might try does it "wake up" if i put RPM signal emulation to it on bench..

But sorry i will be back to this later as my bench is halted in another process for 5 days still.. stupid 6 digit pin code .

[wrybread]

I’ve kept Evap monitor not ready for 1000 miles or more with tank over 3/4 full

I've now driven 200 miles and indeed the Evap monitor is still "not ready". Unfortunately so is my SAS test...

Can you confirm that you were able to get the SAS test to run even with a full tank of fuel?

And I have done the SAS test delete mod.