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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old June 5th, 2009, 19:08   #1
seb8191
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Default Camshaft/crankcase sensor location

I have an 04 Jetta TDI with a hard start issue plus error code PO726 which is the cam shaft sensor. I decided I would like to change it so that I dont have that error message. I just dont know where I can purchase the senor and where its located? Can some one point me in the right direction?
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Old June 7th, 2009, 02:09   #2
2004STARWARSTDI
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Default G28

I believe you are refering to the Engine speed sensor. Problably can be purchased from world impex, autohause or other online vendors. It is located on the engine to the right and below of oil filter housing mount. Held in by 1 bolt which torque is 10Nm (7 ft lb).
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Old June 8th, 2009, 05:23   #3
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thanks! ya the speed sensor
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Old June 8th, 2009, 05:26   #4
oilhammer
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Cam sensor is at the front of the engine, reads off of the cam sprocket.

Crank sensor is at the rear of the engine, in the block.
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Old June 8th, 2009, 05:54   #5
seb8191
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Is the speed sensor only for automatics?
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Old June 8th, 2009, 05:58   #6
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the sensor is i believe a speed sensor, its what i get when I get a PO725 CEL
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Old June 8th, 2009, 06:09   #7
oilhammer
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Quote:
Originally Posted by seb8191
Is the speed sensor only for automatics?
The auto trans also has a couple speed sensors, independant from the ones on the engine.

Please do not use a generic scan tool for these cars. You will not get the whole story, and may in fact get the WRONG information.
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Old June 8th, 2009, 06:15   #8
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ohh really! what should I use? I actually did use a scan tool
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Old June 8th, 2009, 06:16   #9
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The VCDS will work great, that is what I use. Baum tools also makes a great Euro scan tool. But it is expensive.
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Old June 8th, 2009, 16:32   #10
2004STARWARSTDI
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Default Cam sensor

Oilhammer is correct on cam sensor-did not show it in 04 Bentley but did show it in 06 Bentley. Cam sensor is G40 located right of engine on camshaft gear according to Bentley. Engine speed sensor G28 is behind oil filter assembly. To release harness connector without assembly tool, push connector against engine speed sensor & simultaneously lift up on release tab with a thin wire hook. Hope you find out which sensor it is with VagCom/VCDS.
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Old June 9th, 2009, 12:53   #11
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And the sensors are fairly bulletproof.

Wiring issues are at least as common (if not more so) than actual sensor failures.

Examine your wiring harness and connectors in detail. You can also check your sensor; I think you will find it ok.

The cam sensor sees a wheel behind the cam sprocket. It is not a toothed wheel in the normal manner. It has pieces of metal of varying width in places, with other pieces of varying widths removed. This lets the sensor report to the ECU not just how fast the cam is turning, but also which cylinder is presently at TDC.
As I said, my 05 pd will run with the sensor unplugged. The PD educational pdf in the photo section indicates that is normal. (By the way the BEW will not run without the crank sensor, but the BRM can run as long as either the crank or the cam sensor is working.)
The cam sensors normal resistance is greater than 6 Mohms for any and all pins to ground, with either positive or negative ground.
The sensor pin to pin readings were all greater than 6 Mohms, with the following exceptions:
Pin 1 neg to pin 3 positive = 2.89 Mohm.
Pin 2 neg to pin 3 positive = 1.95 Mohm.
The plug (wiring harness) pin to ground(negative) readings (key off) are :
pin1 = 26 to 50 ohms (varying, seemed mostly 50 ohms)
Pin 2 =4.35k ohms
Pin 3 = 0 ohms.
The plug (wiring harness) pin to ground (negative) voltage readings (key on) are:
Pin 1 = 12.5 volts
Pin 2 = 5.0 volts
Pin 3 = 0 volts
When I started the car (yeah it runs) with the plug off and checked the voltages again, the only one that changed was:
Pin 1 = 14.3 volts.
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Old June 11th, 2009, 04:25   #12
seb8191
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cool thank u ill give it a try
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Old April 17th, 2014, 16:56   #13
DizilLubber
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Quote:
Originally Posted by DanG144 View Post
And the sensors are fairly bulletproof.

Wiring issues are at least as common (if not more so) than actual sensor failures.

Examine your wiring harness and connectors in detail. You can also check your sensor; I think you will find it ok.

The cam sensor sees a wheel behind the cam sprocket. It is not a toothed wheel in the normal manner. It has pieces of metal of varying width in places, with other pieces of varying widths removed. This lets the sensor report to the ECU not just how fast the cam is turning, but also which cylinder is presently at TDC.
As I said, my 05 pd will run with the sensor unplugged. The PD educational pdf in the photo section indicates that is normal. (By the way the BEW will not run without the crank sensor, but the BRM can run as long as either the crank or the cam sensor is working.)
The cam sensors normal resistance is greater than 6 Mohms for any and all pins to ground, with either positive or negative ground.
The sensor pin to pin readings were all greater than 6 Mohms, with the following exceptions:
Pin 1 neg to pin 3 positive = 2.89 Mohm.
Pin 2 neg to pin 3 positive = 1.95 Mohm.
The plug (wiring harness) pin to ground(negative) readings (key off) are :
pin1 = 26 to 50 ohms (varying, seemed mostly 50 ohms)
Pin 2 =4.35k ohms
Pin 3 = 0 ohms.
The plug (wiring harness) pin to ground (negative) voltage readings (key on) are:
Pin 1 = 12.5 volts
Pin 2 = 5.0 volts
Pin 3 = 0 volts
When I started the car (yeah it runs) with the plug off and checked the voltages again, the only one that changed was:
Pin 1 = 14.3 volts.
I realize this thread seems pretty old, but I just have to thank this forum again and particularly this poster.

2004 BEW three years ago starts slow, idles rough, and when I got my VCDS I see sensor cam shaft position no signal. About to spend 80 bucks and my time, I note the test points. Sensor double the resistance as stated, Wiring harness color code different and Resistance in female side plug, 1 open, 2 correct 3 open and accurate..Key on, 1 no volts, 2 5 volts accurate 3 proper.

Here is what I did to prove the sensor good. Rather than tear out the PCM to trouble shoot the number 1 no volts. I figured there must be an easier way.

Hoping this helps others, I figured with my new toy the VCDS setting at 0.0 I put a very thin needle through the harness wire near pin 1. I cut a wire and with hemostats tied the wire to the needle then to the battery plus. Started car amazingly in half crank, runs smooth and VCDS registered a negative 1.5 so I found this poster to be right on. I suspect I should tweek the cam timing in advance to 0 or .5, but I'll wait till timing belt change and let VW do that. Car is running fantastic at 257K miles. Timing belt next January.

I used a needle not to damage a good wire. I will then use the same needle and hit midway until I get a continuity reading then jump to that point rather than disturb the PCM that is a job in itself. My test points are now held together with tape and wrapped wire to battery.

Thank you my friend and members. Dizilluber
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