Question about 2001 Toyota Echo

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Variable valve timing system?

Engine light came on stopped in at Autozone they hooked up machine and the result was Variable valve timing system What is that and where is it located?

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There are two components to a Variable Valve Timing (VVT) system; if you had a Check Engine Light (CEL) come on and checked at Autozone they should be able to help you differentiate which component is failing.

The first is the Oil Control Valve (OCV) which is a solenoid attached to a spool valve. This takes an electrical signal from the Engine Control Module (ECM) and turns it into linear motion through a solenoid, which controls the spool valve, which is a fancy word for a differential hydraulic valve (meaning it generally has two outputs that it can supply full/0 pressure, full/full pressure, or 0/full pressure, or any range in between. If the ECM is the brain of your car, the OCV is the brain of your VVT.

The second component is the cam phaser (some times referred to as a cam adjuster). This is a fancy pulley attached to the end of the cam shaft in your car which allows the ECM to control the timing of your engine. Timing can either be advanced or retarded, meaning the valves in your engine (which let air and fuel into or out of your engine) open earlier or later than usual.

The OCV is typically much easier to replace because you can usually see it on the exterior of the engine (the solenoid sticks out from the head to keep the coils cool). Cam phasers them selves are a much more in depth repair; you have to remove the timing cover (and everything to get to it).

Very frequently the issue is not with the phasers themselves but with the timing chain/belt tensioners. While they are just as much of a pain to access as the phasers, they are usually a lot cheaper.

Hope this helps.

Posted on Feb 14, 2013

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SOURCE: 2006 Toyota Avalon Limited, 70,000

charc, cansiter vsc comes on with check engine light

Posted on Sep 22, 2010

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P0022 for 2004 toyota sienna van


P0022 Toyota - Camshaft Position \'A\' Timing Over-Retarded Bank 2



























Possible causes




- Dirty Oil

- Faulty variable valve timing (VVT)

- Faulty oil control valve (OCV)

- Variable Valve Timing (VVT) harness is open or shorted

- Oil Control Valve (OCV) circuit is open or shorted

- Damaged Engine Control Module (ECM)




Tech notes



If the engine oil is clean and the VVT and OCV circuits are OK, replaced the VVT to resolve the problem.





When is the code detected?


After the ECM sends the target duty cycle signal to the OCV, the ECM monitors the OCV current to establish an actual duty cycle. The ECM determines the existence of a malfunction and sets the DTC when the actual duty cycle ratio varies from the target duty cycle ratio.


Possible symptoms


- Engine Light ON (or Service Engine Soon Warning Light)

- Lack/Loss of power

- Engine rough idle


P0022 Toyota Description


The Engine Control Module (ECM) controls the Oil Control Valve (OCV) to regulate the intake camshaft angle. As a result of the angle change, the engine timing is advance or retard. Optimizing engine timing will help the engine improve torque and fuel economy, and the exhaust emissions decrease under overall driving conditions. The Variable Valve Timing (VVT) system includes the Oil Control Valve (OCV) and VVT controller. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control.

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Aug 14, 2014 | Cars & Trucks

1 Answer

What dos vvt system malfunction it mean ?


Variable Valve Timing System Malfunction, and possible causes - dirty or low engine oil
- Valve timing
- Oil control valve
- Variable Valve Timing controller assembly
- Engine Control Module (ECM)

Read more: http://engine-codes.com/p1349_toyota.html#ixzz38fIMYdTd

Jul 27, 2014 | 1999 Daihatsu Sirion

1 Answer

Check engine light came on and I had pep boys test it. These codes came back PO0303 and PO0171 how do I fix it?


P0303 is a misfire on cylinder 3 - check the ignition and injector on that cylinder.
P0171 means engine is running lean (probably related to the above).
Start by checking the tune of the engine, verifying with a timing light that all cylinders have spark. Since these are coil over plug, swapping cylinder 2 with cylinder 3 should result in P0302 in addition to P0303 DTCs being set. If there's a problem with the VVT (Variable Valve Timing system) then there should be a DTC associated with that as well.

If you have spark, then it goes on towards a faulty injector. If both spark and fuel are present, it's possible that the VVT (Variable Valve Timing) system is freewheeling cylinder 3. Usually that implies the hydraulic lifter seals are faulty though there should be a noticeable valve tap at idle.

In any case, testing out ignition then fuel then ruling out VVT-related issues should resolve the problem completely. I have seen many of these have problems with the plumbing to the valve lifters getting clogged and that results in a dead cylinder.

Oct 06, 2013 | 2005 Volvo S40

1 Answer

I have the VSC, Trac off and CEL on in my 2005 Scion XB


Here is the actual description of the code and possible causes.

P0012 SCION Description The Engine Control Module (ECM) controls the Oil Control Valve (OCV) to regulate the intake camshaft angle/timing. As a result of the angle change, the engine timing is advance or ******. Optimizing engine timing will help the engine improve torque and fuel economy, and the exhaust emissions decrease under overall driving conditions. The Variable Valve Timing (VVT) system includes the Oil Control Valve (OCV) and VVT controller. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control.
- Dirty or low engine oil
- Faulty variable valve timing (VVT)
- Faulty oil control valve (OCV)
- Variable Valve Timing (VVT) harness is open or shorted
- Oil Control Valve (OCV) harness circuit is open or shorted
- Damaged ECM
Read more: http://engine-codes.com/p0012_scion.html#ixzz26Ts0Bso9

Sep 12, 2012 | 2005 Scion xB

1 Answer

EL VEHICULO TIENE PERDIDA DE POTENCIA Y EN EL SCANNER MUESTRA LOS CODIGO PO0011; PO0012


P0011 - "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
A code P0011 refers to the VVT (variable valve timing) or VCT (variable camshaft timing) components and the car's PCM (powertrain control module, also called an ECM). That consists of a few different components but the P0011 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is above a set limit (over-advanced), the engine light will be illluminated and the code will be set. The "A" camshaft is either the intake, left, or front camshaft.

Potential Symptoms: Most likely a P0011 DTC will result in one of the following: hard starting, poor idle, and/or stalling. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.

Causes: A P0011 DTC trouble code may be caused by one or more of the following:
Incorrect camshaft timing
Wiring problems (harness/wiring) in intake timing control valve control solenoid system
Continuous oil flow to VCT piston chamber
Failed timing valve control solenoid (stuck open)

Possible Solutions: This DTC code is a result of a mechanical fault of the VCT unit or related components, so there is no need for electrical diagnosis. Refer to vehicle specific repair manual to perform component tests for the VCT unit. Notes: Dealer techs have advanced tools and the ability to follow detailed troubleshooting steps, including the ability to test components using a scan tool.


P0012 - "A" Camshaft Position - Timing Over-Retarded (Bank 1)
A code P0012 refers to the VVT (variable valve timing) or VCT (variable camshaft timing) components and the car's PCM (powertrain control module, also called an ECM). That consists of a few different components but the P0012 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set. The "A" camshaft is either the intake, left, or front camshaft.

Potential Symptoms: Most likely a P0012 DTC will result in one of the following:
hard starting
poor idle and/or
stalling

There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.
A code P0012 refers to the VVT (variable valve timing) or VCT (variable camshaft timing) components and the car's PCM (powertrain control module, also called an ECM). That consists of a few different components but the P0012 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set. The "A" camshaft is either the intake, left, or front camshaft.

Causes: A P0012 DTC trouble code may be caused by one or more of the following:
Incorrect camshaft timing
Wiring problems (harness/wiring) in intake timing control valve control solenoid system
Continuous oil flow to VCT piston chamber
Failed timing valve control solenoid (stuck open)

Possible Solutions:
The main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit. Notes: Dealer techs have advanced tools and the ability to follow detailed troubleshooting steps, including the ability to test components using a scan tool.

Hope this helps. Suerte.

May 30, 2011 | Toyota Yaris Cars & Trucks

1 Answer

Need to know what this code is for 2003 toyota corolla -p1349vvt.oil light and check engine comes on.


you are having a problem with the variable valve timing system which depends on oil pressure to move an actuator which changes the valve timing. this could be because the actuator is clogged or your engine oil pressure is too low. Check the engine oil level first. If the engine has the proper amount of oil, you will need to have the oil pump pressure checked. If that is good, then the variable valve timing actuator should be checked for clogging.

Jan 09, 2011 | 2003 Toyota Corolla

1 Answer

After diagnosis my v8 740i bmw indicated the "variable valve gear guide sensor for bank 2 and variable valve gear learning stops necessary" currently it's difficult accelerating the engine. would...


You have a v8 with a "variable valve gear guide sensor" on each bank. The trouble code is telling you that bank#2 sensor is faulty, or its signal is not getting to the engine computer.

Consequently, when bank#1 adjusts the timing (under hard acceleration or higher revs), bank #2 is not getting adjusted.

If the variable valve timing is not being activated (low load, load revs) the engine will run more or less normally.

Get the car to the dealer. You risk MAJOR ENGINE DAMAGE if you keep driving it.

SD

Jan 06, 2011 | BMW 750 Cars & Trucks

1 Answer

Engine light on, rattling valves, truck shakes when start and stop


How many miles on it ? Engine light on ? have it checked for DTC'S -diagnostic trouble codes . could have timing chain issues or a problem with the VVT system - do you know what that is ?
In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems.
Your best bet ,take it to a qualified repair shop ,dealer .

Oct 19, 2017 | 1996 Ford F150 Regular Cab

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