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Vvti 1.5 cam sticky in advance mode - Cars & Trucks

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Replace the cam actuator on the end of the cam shaft

Posted on Nov 22, 2013

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Passat 2001 with codes P0012,P0340 it runs fine the turbo kicks in no problem I originally found some broken vaccum line and replaced them but the codes still return


P0340 - Camshaft Position Sensor Trouble
Your cam timing timing is off and the sensor is fine. They are very simple sensors...it's just a magnet...and magnets don't go bad. Check the timing. Incorrect allocation means that the camshaft isnt where the computor thinks it should be at any given time. This could be casued by the base engine timing being off by a tooth or by a problem in the camshaft adjuster.


P0012 Camshaft A: Advance Setpoint not Reached
The code P0012 can be set by the following concerns: Faulty cam adjuster, Faulty cam adjuster solenoid, Low oil pressure, Sludged oil passages and Sticky camshaft.

The variable cam timing uses engine oil pressure diverted to the adjuster mechanism by a solenoid duty cycled by the PCM. Low oil pressure or severe oil sludging can affect camshaft timing operation. Always check oil level and condition when camshaft adjustment codes are present.

Using a full function Volkswagen compatible scan tool enter address word 01 (Engine). Function 08 (Read Measuring Value Blocks) and Display Group 091 (Power Enhancement Camshaft Adjustment).

Observe the 4th display field "Active Camshaft Adjustment Angle" With the engine at idle. The 4th display field should read between -3.0 to +6.0 degrees KW if the camshaft is in the normal unadvanced position. Any other reading at idle indicates that the camshaft is shifted from the normal unadvanced position

Accelerate the vehicle from a standstill in 1st gear using wide-open throttle and observe the display in field 4 again. Under heavy acceleration the display should read between +16.0 to +25.0 degrees KW. This indicates that the camshaft has shifted to the full advance position.

If the display in field 4 does not change from the values in test step 2 or if the display changes but does not reach a minimum of +16.0 degrees KW (i.e. between +6.0 and +16.0 degrees KW), the camshaft timing adjuster mechanism is not advancing the camshaft.

Failure to advance the camshaft could be caused by a faulty cam adjuster, a faulty cam adjuster solenoid, low oil pressure, sludged oil passages, or a sticky camshaft.


Hope this helps (remember to rating this free answer and leave ue some testimonial comment)

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Corolla 1.6 VVTI motor the 3ZZFE motor: the timing marks are on TDC as well as cam timing as manual illustrated - on which piston will the inlet valve open and exhausted valve open?


With engine Crankshaft on TDC and cam timing set correctly this is the position where No. 1 cylinder is firing at the start of the power stroke. At this point No. 4 cylinder is also at TDC but is just at the end of the exhaust stroke and starting the intake stroke so the exhaust valve will be almost finished closing and the inlet valve will just be starting to open. This is referred to as the inlet and exhaust valves rocking.

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