Nay-Sayer Posted June 3, 2014 Share Posted June 3, 2014 I have a 2001 Nissan Pathfinder with 207k on the clock and it is passing ODB-II codes P1491, P1110 and P1135. Anyone have a clue what's going on? Thanks Link to comment Share on other sites More sharing options...
ferrariowner123 Posted June 3, 2014 Share Posted June 3, 2014 Download the FSM on NICO club and go to engine section and just go to the index and it should list the codes you are looking for, it's a good place to start. I know nothing about VQ's but that's where I want start. -Kyle Link to comment Share on other sites More sharing options...
Precise1 Posted June 4, 2014 Share Posted June 4, 2014 You can get a link to the FSM from a thread pinned in the Garage section. That will tell you codes, trouble shooting, repair/replacement and everything else you could want. (don't have that manual so can't get the code definitions any easier than you can) B Link to comment Share on other sites More sharing options...
Alkorahil Posted June 4, 2014 Share Posted June 4, 2014 P1491 is not related to P1110 and P1135. P1110 and P1135 are for the left and right variable camshaft solenoids timing advance. These solenoids work off oil pressure to advance the timing of the engine. As the vehicle gets older with high miles likes yours it gets a little cranky sometimes as the oil pressure isnt as high now as it was new, this makes the ECU think the eis a problem as the soldenoids dont advance as much as the ECU expects them to. Check and change your oil if it has been awhile and make sure to change the oil at regular intervals. Changing to a 10-40 oil might help as well. P1491 is the vaccum cut valve bypass valve. It is located in the rear of the truck under the body near the top of the rear spring. 1 Link to comment Share on other sites More sharing options...
Nay-Sayer Posted June 5, 2014 Author Share Posted June 5, 2014 P1491 is the vaccum cut valve bypass valve. It is located in the rear of the truck under the body near the top of the rear spring. Thanks for your reply. Can fueling your vehicle with the engine running cause this code? Link to comment Share on other sites More sharing options...
Alkorahil Posted June 6, 2014 Share Posted June 6, 2014 Thanks for your reply. Can fueling your vehicle with the engine running cause this code? No. You need to replace the part. You can minimize the number of times the light comes on though after clearing the code by only filling up 3/4 of the way. Outside temp, humidity and pressure trigger this. Now that it is summer it will happen more often then when it is cold. 1 Link to comment Share on other sites More sharing options...
Nay-Sayer Posted June 16, 2014 Author Share Posted June 16, 2014 No. You need to replace the part. You can minimize the number of times the light comes on though after clearing the code by only filling up 3/4 of the way. Outside temp, humidity and pressure trigger this. Now that it is summer it will happen more often then when it is cold. One last question; can a malfunctioning vacuum cut bypass valve have a negative impact on fuel economy? Thanks again. Link to comment Share on other sites More sharing options...
Alkorahil Posted June 17, 2014 Share Posted June 17, 2014 One last question; can a malfunctioning vacuum cut bypass valve have a negative impact on fuel economy? Thanks again. Yes. Though it would be a small decline, about 1 MPG or so. Link to comment Share on other sites More sharing options...
Alkorahil Posted June 17, 2014 Share Posted June 17, 2014 One last question; can a malfunctioning vacuum cut bypass valve have a negative impact on fuel economy? Thanks again. Yes it would but marginally, like a loss of 1 MPG or so. Link to comment Share on other sites More sharing options...
Nay-Sayer Posted June 28, 2014 Author Share Posted June 28, 2014 I just learned today that the Pathfinder has an oil leak. Could this cause the P1110 and P1135 codes? Thanks. Link to comment Share on other sites More sharing options...
Nay-Sayer Posted June 29, 2014 Author Share Posted June 29, 2014 Update: Got the oil changed yesterday. The tech who told me about the leak said that the Pathfinder was down a quart of oil. Have driven it some since getting the oil changed and the check engine light has gone out. Link to comment Share on other sites More sharing options...
Precise1 Posted June 30, 2014 Share Posted June 30, 2014 P1491 is not related to P1110 and P1135. P1110 and P1135 are for the left and right variable camshaft solenoids timing advance. These solenoids work off oil pressure to advance the timing of the engine. As the vehicle gets older with high miles likes yours it gets a little cranky sometimes as the oil pressure isnt as high now as it was new, this makes the ECU think the eis a problem as the soldenoids dont advance as much as the ECU expects them to. Check and change your oil if it has been awhile and make sure to change the oil at regular intervals. Changing to a 10-40 oil might help as well. P1491 is the vaccum cut valve bypass valve. It is located in the rear of the truck under the body near the top of the rear spring. Seems that way... Did anyone chack the oil since that was posted almost 4 weeks ago? B Link to comment Share on other sites More sharing options...
Nay-Sayer Posted July 2, 2014 Author Share Posted July 2, 2014 Seems that way... Did anyone chack the oil since that was posted almost 4 weeks ago? B Yes, the oil was changed 4 days ago. It was a quart low. Link to comment Share on other sites More sharing options...
Nay-Sayer Posted August 13, 2014 Author Share Posted August 13, 2014 P1491 is the vaccum cut valve bypass valve. It is located in the rear of the truck under the body near the top of the rear spring. I changed the vaccum cut valve bypass valve about a week ago but my truck is still popping code P1491. What else can be done to correct this? Thanks. Link to comment Share on other sites More sharing options...
pathfinder2001 Posted August 18, 2016 Share Posted August 18, 2016 Did you ever get P1491 code off? Link to comment Share on other sites More sharing options...
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