× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

P1491 Diagnostic Trouble Code Discussion for April 2010

EVAP Vacuum Cut Valve/Bypass Circuit Malfunction

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P1491
Help Request Posted
2000 Nissan Sentra GXE 1.8L Poor Idle Quality, Hesitation, Cuts out VIN: 3N1CB51D8Y
P1491: EVAP Vacuum Cut Valve/Bypass Circuit Malfunction. Vehicle came in with complaint of intermittent no power. I was able to confirm on a test drive and in the shop. At wot I was holding at 20 mph. TPS , intake temp, coolant temp all looked normal. Maf reading looks erratic and tops out at 2.8 volts while rpm top...
April 23, 2010