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Posted on Jan 02, 2017
SOURCE: check engine on p1784 and p1490
they are mfg specific codes the p1490 code islow speedfan control relay circuit
Posted on Oct 22, 2009
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it's losing fuel pressure somewhere I would start with the filter check for any leaks then chek fuel rail poss band sensor at fuel pump also
Posted on Jul 27, 2010
SOURCE: 2001 nissan altima
DTC P1441 - Vacuum Cut Valve Bypass Valve
Codes is for a very small leak code, usually the gas cap is the most common problem. Even if the cap looks ok it may need to be replaced. Als check the next items:
- Incorrect fuel tank vacuum relief valve.
- Incorrect fuel filler cap used.
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap.
- Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve.
- Foreign matter caught in EVAP canister vent control valve.
- EVAP canister or fuel tank leaks.
- EVAP purge line (Pipe and rubber tube) leaks.
- EVAP purge line rubber tube bent.
- Blocked or bent rubber tube to EVAP control system pressure sensor.
- Loose or disconnected rubber tube.
- EVAP canister vent control valve and the circuit.
Te same problem we foudn in a Sentra 1.8L, then removed the vacuum cut valve bypass valve and tested it. With no voltage across the terminal we could blow through one hose and it comes out the other, with voltage we can feel the unit buzzing (it is essentially an electromagnet) but still no change, airflow is not stopped. Pulled the metal cage off and plunger dropped out. The exterior sealing o-ring looks okay. It seems like the plunger isn't sealing off internally when the coil is energized, even if pressed the plunger down by hand with good force it would not seal. That said I think I can safely state that this item is defective and the cause of the check engine code.
Our minimal issue is that the local Nissan dealer wants over $100 for solve this, that is a fairly common problem. If you can't seem to find an online source for this part,I suggest visit some junkyard.
Keep in mind that the P1441 is a very hard code to diagnose, as it's very "general". There are a list of things that can cause this code, and there is a Technical Service Bulletin issued by Nissan that states it can even be faulty ECM (on-board computer) programming.
The vacuum cut valve and vacuum cut valve bypass valve are installed in parallel on the EVAP purge line between the fuel tank and the EVAP canister.
The vacuum cut valve prevents the intake manifold vacuum from being applied to the fuel tank.
The vacuum cut valve bypass valve is a solenoid type valve and generally remains closed. It opens only for on board diagnosis.
The vacuum cut valve bypass valve responds to signals from the ECM. When the ECM sends an ON (ground) signal, the valve is opened. The vacuum cut valve is then bypassed to apply intake manifold vacuum to the fuel tank.
Here are the reasons that can cause this failure code:
This diagnostic process will require a scantool with advanced diagnostic capabilities. The vacuum bypass valve is more than likely the problem, but I cannot be sure until all of the components are properly tested. You can try to replace the valve but I cannot guarantee that this will solve your issue.
After that you replace this device, if the light goes out and stays off for 200-300 miles, then the vehicle will pass inspection. The vehicle must complete a drive cycle after the light goes off so that it will pass inspection. This is an emission issue, and will not cause any issue with driveability.
You should be able to remove the valve without dropping the rear suspension, but it is a tight fit. I would suggest a swivel socket to remove the bolts that hold the valve on.
Hope this helps.
Posted on Aug 10, 2011
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Jul 13, 2012 | Cars & Trucks
Jun 18, 2012 | Nissan Frontier Cars & Trucks
NISSAN OBDII DTC
P1105 Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Circuit
P1110 Intake Valve Timing Control Circuit (Bank 1)
P1120 Secondary Throttle Position Sensor Circuit
P1125 Tandem Throttle Position Sensor Circuit
P1132 Intake Valve Timing Control Position Sensor (Bank 1)
P1135 Intake Valve Timing Control Circuit (Bank 2)
P1137 Intake Valve Timing Control Position Sensor (Bank 2)
P1140 Intake Valve Timing Control Position Sensor (Bank 1)
P1145 Intake Valve Timing Control Position Sensor (Bank 2)
P1148 Closed Loop Fault Detected (Bank 1)
P1168 Closed Loop Fault Detected (Bank 2)
P1210 Traction Control System Signal Fault
P1220 Fuel Pump Control Module Fault
P1320 Ignition Control Signal Fault
P1335 Crankshaft Position Sensor Circuit
P1336 Crankshaft Position Sensor circuit
P1400 EGR/EVAP Control Solenoid Circuit
P1401 EGR Temperature Sensor Circuit
P1402 EGR System Fault Detected
P1440 EVAP Canister System Leak Detected
P1441 EVAP Vacuum Cut Valve Bypass Valve Circuit
P1443 EVAP Canister Control Vacuum Switch Circuit
P1444 EVAP Canister Purge Volume Control Valve Circuit
P1445 EVAP Purge Volume Control Valve
P1446 EVAP Canister Vent Valve Circuit
P1447 EVAP Canister Purge Flow/Volume Control Valve Circuit
P1448 EVAP Vent Control Valve Circuit
P1490 EVAP Vent Control Valve/Bypass Valve Circuit
P1491 EVAP Vacuum Cut Valve/Bypass Valve Circuit
P1492 EVAP Canister Purge Control Valve/Solenoid Valve
P1605 Transmission Control Module A/T Diagnosis Communication Line Fault
P1705 Throttle Position Switch Circuit
P1706 Park Neutral Position Switch Circuit
P1760 Overrun Clutch Solenoid Valve Circuit
P1900 Cooling Fan Control Circuit
sorry but your code reader is not reading manufacturers codes ,if an american market vehicle then you should be able to read them but if this is a europeon model then how did you manage to get this code??
P0235....Turbo/Super Charger Boost Sensor 'A' Circuit
this is a generic code if its any help
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