Manager Forum

Got this Jetta in with an overheating / head gasket problem. after sending the head out we got back the cam sensor broken. whether it was the head shop or a prior prob we don't know but after puting it all togeather and a test drive the p0341 cam sensor circuit code cam up. we had already put on a new sensor. so we did the testing good continuity (.02 ohms) b/t the sensor and computer and good voltage at the sensor (4.89 volts) looking for ideas. also good ground to block.

an improper timing belt alignment will defiantly cause this. a quick little tip on how to move a belt a tooth at a time is to take he smooth end of a 1/4" drill bit and place it on between the cogs on the cam gear. turn the engine over with a socket on the crank bolt. depending on which side of gear and which way you turn the engine is the way the belt will jump a tooth. don't use a bolt. the surface has to be smooth or it will damage the integrity. i can't tell you how many times i've cured belt alignment issues doing this.

i checked timing and saw it to be dead on but tried moving it a tooth forward and a tooth backward. no luck light still comes on during second key cycle. same 341 code anybody have any other ideas? could this be a pcm issue?

on a limb here but was the sensor ordered from a dealer and by vin?

no it was from advance autoparts but if it makes you feel better it was made in germany.

Ive never ran into this but found this if it helps:
The G40 Camshaft Position (CMP) sensor is located in the distributor. The distributor is driven by a separate shaft and can be easily misaligned during camshaft belt replacement.

1. Verify that the G40 sensor is in proper phase with the G28 engine speed sensor (located in the block near the oil filter housing), by placing the engine at Top Dead Center (TDC) #1 cylinder. Be sure to have the crankshaft set exactly on TDC #1.

2. Remove the distributor cap and verify that the distributor rotor is pointed exactly at the notch in the distributor body. A slight misalignment of the distributor is sufficient to set code P0341.
NOTE: It may be necessary to remove the locating pins on the distributor housing to gain enough movement to bring the distributor back into the correct position.

3. If the position is correct, test the hall signal from the distributor by back probing the 3-pin connector and testing for battery voltage between pins 1 and 3 (at least 11v) and reference voltage on pin 2 (between 5 and 11v). As the distributor turns, reference voltage on pin 2 has to drop to less than 1v (as the window in the distributor passes the pickup) and then go back to its normal value. A lab scope will show a square wave output on that wire.

another side thought. the key way was missing off of the cam gear when it came back from the machine shop and we replaced it with a common new keyway is it posible that the keyway is an off set type?

A second start 341 usually indicates that timing is incorrect, but not always. If you're absolutely sure the timing is on and the wiring is ok, take a look at the shutter that is on the backside of the cam gear. It may be distorted or damaged. If not, I'd go with a factory cam sensor. VW is not very tolerant of aftermarket parts.

brianp87 wrote:Ive never ran into this but found this if it helps:
The G40 Camshaft Position (CMP) sensor is located in the distributor. The distributor is driven by a separate shaft and can be easily misaligned during camshaft belt replacement.

1. Verify that the G40 sensor is in proper phase with the G28 engine speed sensor (located in the block near the oil filter housing), by placing the engine at Top Dead Center (TDC) #1 cylinder. Be sure to have the crankshaft set exactly on TDC #1.

2. Remove the distributor cap and verify that the distributor rotor is pointed exactly at the notch in the distributor body. A slight misalignment of the distributor is sufficient to set code P0341.
NOTE: It may be necessary to remove the locating pins on the distributor housing to gain enough movement to bring the distributor back into the correct position.

3. If the position is correct, test the hall signal from the distributor by back probing the 3-pin connector and testing for battery voltage between pins 1 and 3 (at least 11v) and reference voltage on pin 2 (between 5 and 11v). As the distributor turns, reference voltage on pin 2 has to drop to less than 1v (as the window in the distributor passes the pickup) and then go back to its normal value. A lab scope will show a square wave output on that wire.

I think the AEG engine has no distributor. Only the ABA engine did.

I have no idea I just put 2.0 AEG in identifix since I rarely work on vw's in hopes it would help him

OEM VW sensor fixed the prob. thanks guys

HINEMANS wrote:OEM VW sensor fixed the prob. thanks guys

another issue caused by an after market part. it seems i'm seeing this more and more.........................