[jdm_type]

When you pull misfire codes on all cylinders of a Voklswageb. it may seems like a simple fix. But when all the usual suspects check out ok, your dream job can turn into a real nightmare.

Even with the assistance, this was still a challenging job. eventually identifying the fix as replacing the serpentine belt. And while it took some time to figure out, our perseverance and the feeling of peer to peer support helped this tech stay focused in the face of frustration until we got the job done.

Concer: P0012 (vw 16390), specification not reach for camshaft advance bank1.

Tests:

1. Using Volkswagen compatible scan tool enter address word 01 (Engine). Function 08 (Read Measuring value Blocks) and display Group 091 (Power Echacement Camshaft Adjustment).
2. 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 non advanced position. Any other reading at idle indicates the camshaft is shifted from the normal non-advanced position.
3. Accelerate the vehicle from the standstill in 1st gear using wide open throttle and observe the display in field 4 again. under heavy acceleration the display should read between 6.0 +2.0 degrees KW. This indicate that the camshaft has shifted to the full advance position.
4. If the display in field 4 does not change from the value in the test step 2 or if the display change but does not reach a minimum of 6.0 degrees KW, the camshaft timing adjuster mechanism is not advancing the camshaft.
5. Failure to advance the camshaft could be caused by faulty cam adjuster, a faulty cam adjuster solenoid, low oil pressure, studge oil passages or sticky camshaft.

Potential Cause:

• Cam adjuster
• Sticking Camshaft
• Camshaft adjuster solenoid
• Restricted Oil Passages
• Insufficient oil pressure

Confirmed Fix: Replace Camshaft adjuster solenoid


Additional Tip:

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 sledging can affect camshaft timing operation. always check oil level and condition when camshaft adjustment codes are present.

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