Jeigh Posted March 9, 2011 Report Share Posted March 9, 2011 So, I just threw a 455 code last night. First code I've had since this pervious post on Feb. 9th. Pretty sure I've driven over 1000 miles since then, so I don't really know what to make of this. Just wanted to throw this up. could it be because a vacuum line on the valve or pump or something is off the car so the ecu thinks its malfunctioning? Quote Link to comment Share on other sites More sharing options...
Fudge_Brownie Posted March 9, 2011 Report Share Posted March 9, 2011 could it be because a vacuum line on the valve or pump or something is off the car so the ecu thinks its malfunctioning? 455 can be a number of things, including what you just said. Gas cap, vac lines, charcoal canister, purge valve etc etc. But if you're implying that I might have removed any SAS components after doing the delete, I didn't. I left all the stuff in and just deleted at the ECU. Only reason I posted this is because while not understood, there seemed like there might have been some unknown correlation. Quote Link to comment Share on other sites More sharing options...
Jeigh Posted March 9, 2011 Report Share Posted March 9, 2011 455 can be a number of things, including what you just said. Gas cap, vac lines, charcoal canister, purge valve etc etc. But if you're implying that I might have removed any SAS components after doing the delete, I didn't. I left all the stuff in and just deleted at the ECU. Only reason I posted this is because while not understood, there seemed like there might have been some unknown correlation. I used to have a 455 code that mysteriously went away after 3 days. So i was skeptical about doing this delete and making it come back. But I need to get rid of my PO410 so I'm just gonna go for it. Quote Link to comment Share on other sites More sharing options...
flaco Posted March 11, 2011 Report Share Posted March 11, 2011 The ECU will disable some tests if certain codes are present. It's possible that once the SAS test is complete and ok, only THEN will the ecu run the evap test. Keep in mind the EVAP test is disabled (at least on 98s) when outside temperature is below 8C (~50F). So it might be just a concidence due to this time of year... Quote Link to comment Share on other sites More sharing options...
Jeigh Posted March 11, 2011 Report Share Posted March 11, 2011 The temperature never really got below 50 where im at. the high was 82 today <_< Quote Link to comment Share on other sites More sharing options...
Fudge_Brownie Posted March 11, 2011 Report Share Posted March 11, 2011 The ECU will disable some tests if certain codes are present. It's possible that once the SAS test is complete and ok, only THEN will the ecu run the evap test. Keep in mind the EVAP test is disabled (at least on 98s) when outside temperature is below 8C (~50F). So it might be just a concidence due to this time of year... Ahhh, bingo. That makes sense then. Quote Link to comment Share on other sites More sharing options...
ds2728 Posted March 13, 2011 Report Share Posted March 13, 2011 has anyone come up with a "EVAP delete" ?? cause I thru that code also and it might be due to the temp increasing with spring coming. Quote Link to comment Share on other sites More sharing options...
ds2728 Posted March 13, 2011 Report Share Posted March 13, 2011 Why couldn't a resistive voltage divider be placed on the analog input that is the temperature input. if one knew the correct voltage level that equaled the temperature that is just below the temperature that keeps the ecu from testing for the evap. Would this prevent the evap code from being set? would setting the temp to a fixed temperature would this screw anything else up in the ecu or the running of the engine. I know this may be a crazy thought, but I was just sitting here and thinking about this possibility. Thanks, dave Quote Link to comment Share on other sites More sharing options...
flaco Posted March 13, 2011 Report Share Posted March 13, 2011 Why couldn't a resistive voltage divider be placed on the analog input that is the temperature input. if one knew the correct voltage level that equaled the temperature that is just below the temperature that keeps the ecu from testing for the evap. Would this prevent the evap code from being set? would setting the temp to a fixed temperature would this screw anything else up in the ecu or the running of the engine. I know this may be a crazy thought, but I was just sitting here and thinking about this possibility. Thanks, dave Im sure it can be done to prevent the evap test. This will also prevent the evap ready monitor to be set, so you prob dont wanna go there. Quote Link to comment Share on other sites More sharing options...
ds2728 Posted March 13, 2011 Report Share Posted March 13, 2011 Im sure it can be done to prevent the evap test. This will also prevent the evap ready monitor to be set, so you prob dont wanna go there. What's the evap ready monitor do? Quote Link to comment Share on other sites More sharing options...
Volvo5.0 Posted March 14, 2011 Author Report Share Posted March 14, 2011 What's the evap ready monitor do? The ready monitors are set when tests are run and passed for each system (SAS, Evap, O2 Sensor, Etc.) If the ecu never runs the evap test, then the monitors will never set. Even though the CEL might not be on, the car won't pass emissions if monitors aren't set. The reason the SAS delete works is because the ecu can still run the air pump test and it passes. Quote Link to comment Share on other sites More sharing options...
ds2728 Posted March 16, 2011 Report Share Posted March 16, 2011 Success.... I have done the following: SAS delete, I removed the pump, and all hose and vacuum lines. I plugged the vacuum port on the sas valve, and the vacuum port on the manifold that feed the sas solenoid. Replaced the gas cap. I also Replaced plugs, wires, cap, rotor. I have driven car for approx. 130 miles with no CEL. Just to recap, after I completed the SAS delete, I came up with 2 new codes which were Po302 and P0455. The P0302 I wasn't worried about but the EVAP code X@#@$XC. Not sure what I did to remove the evap code, just glad it's gone and stays gone. Thanks for everybody's assistance in getting this resolved. Now all I need to do is resolve where the oil is burning from and I will be done done. thanks, dave Quote Link to comment Share on other sites More sharing options...
francisp Posted April 11, 2011 Report Share Posted April 11, 2011 guys, i have 1997 960 (motronic 4.4 per vin decode) and i have a pending CEL and P0410. I tried this mod, A32 to A37 and the CEL comes back within 2 mins. I ensure the direction of the diode is correct. I even tried A32 to B38 and no luck. Has anyone here tried this mod on a 960? the SAS valve arrangement on 960 is bit different, the valve tubing attaches to the cylinder head/valve cover as opposed to the exhaust on FWD 5cyl cars. what could be different and what i am doing wrong? my pump work, solenoid clicks, but unsure about valve, last time i clean the valve the tube to head had oil present in it. Quote Link to comment Share on other sites More sharing options...
TIZIO AKA 1 HND MEC Posted April 13, 2011 Report Share Posted April 13, 2011 I have done today the diod on the harnes, on my friend car, temp. outside was 52 F! The CEL was on before i do the mod. After 5 min. P0455 came out. The thing that surprise me is wen you shut off the car the CEL. disappear ( Inow sound stupid) wen you turn on the engine the CEL is off and after 2-3 min. came back!! ! . Any IDEA ???? PS: Great mod. by the way. Quote Link to comment Share on other sites More sharing options...
Jeigh Posted April 14, 2011 Report Share Posted April 14, 2011 okay im sorry for this but im a bit confused. is there a correlation between the SAS delete and an evap code? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.