CEL - 005081 - Cylinder 4 Internal Pressure Sensor: Implausible Signal

[biby]

Got a check engine light on this morning, and vag-com returned the following:

2 Faults Found:

005081 - Cylinder 4 Internal Pressure Sensor: Implausible Signal
P13D9 - 000 - - - MIL ON
Freeze Frame:
Fault Status: 11100000
Fault Priority: 2
Fault Frequency: 5
Mileage: 31961 km
Time Indication: 0
Date: 2013.14.29
Time: 20:32:17

Freeze Frame:
RPM: 1219 /min
Speed: 48.0 km/h
Bin. Bits: 00111110
Absolute Pres.: 4.0 bar
(no units): 10.50
Ign. Timing: 3.1 °BTDC
(no units): 4.80

005079 - Cylinder 4 Internal Pressure Sensor: Short to Plus
P13D7 - 000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 2
Fault Frequency: 3
Mileage: 32019 km
Time Indication: 0
Date: 2013.14.30
Time: 16:36:29

Freeze Frame:
RPM: 4301 /min
Speed: 73.0 km/h
Bin. Bits: 00001000
Absolute Pres.: 255.0 bar
(no units): 12.70
Ign. Timing: 0.9 °BTDC
(no units): 4.40


Some search result suggests a bad glow plug on cylinder 4. I'll find some time to make a run to the dealership and report back. Car is a 2010 Golf TDI 6sp, 30000km maintenance done at dealership.

 

[dweisel]

Got a check engine light on this morning, and vag-com returned the following:

2 Faults Found:

005081 - Cylinder 4 Internal Pressure Sensor: Implausible Signal
P13D9 - 000 - - - MIL ON
Freeze Frame:
Fault Status: 11100000
Fault Priority: 2
Fault Frequency: 5
Mileage: 31961 km
Time Indication: 0
Date: 2013.14.29
Time: 20:32:17

Freeze Frame:
RPM: 1219 /min
Speed: 48.0 km/h
Bin. Bits: 00111110
Absolute Pres.: 4.0 bar
(no units): 10.50
Ign. Timing: 3.1 °BTDC
(no units): 4.80

005079 - Cylinder 4 Internal Pressure Sensor: Short to Plus
P13D7 - 000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 2
Fault Frequency: 3
Mileage: 32019 km
Time Indication: 0
Date: 2013.14.30
Time: 16:36:29

Freeze Frame:
RPM: 4301 /min
Speed: 73.0 km/h
Bin. Bits: 00001000
Absolute Pres.: 255.0 bar
(no units): 12.70
Ign. Timing: 0.9 °BTDC
(no units): 4.40


Some search result suggests a bad glow plug on cylinder 4. I'll find some time to make a run to the dealership and report back. Car is a 2010 Golf TDI 6sp, 30000km maintenance done at dealership.

Switching glow plugs from cylinders will tell if the fault is the sensor in the glow plug or something else. In your case,if the fault moves from cylinder 4 to the cylinder that the #4 glow plug was moved to,the glow plug is bad. You may have to run it for a day for the fault to come back after codes are cleared. Or sometimes the fault will show up in a few minutes. Change glow and you're done. If its not the glow plug.....................

dweisel

 

[740GLE]

I'd also look at the wireway around the GP, might be some mice?

 

[biby]

Thanks guys, I will run a quick check tomorrow morning of the wires, and may leave the rest to the dealership. I will see if I can get to talk with the dealer tech about it so as to make sure we are on the same page.

 

[andy7079]

I thought I read in the Self Study that the ECU would substitute a reading from another sensor if one of the sensors failed. Would this lead us to think otherwise?

 

[dweisel]

Maybe find in the Study Guide what it says. I've not read that part. Not sure how you could get a signal from another sensor being its taking a pressure reading on a particular cylinder.

dweisel

 

[andy7079]

Effect of Failure
If one of the pressure sensors fails, a substitute value will be used from the other pressure sensors.

I think the assumption they make is that all four cylinders will have nearly identical pressures, and it doesn't matter which one it uses since it adjusts the ignition (timing, quantity) on an engine level.

However, the proceeding section talks about balancing the injection and burn for all the cylinders, to account for manufacturing tolerances and engine aging. Maybe it does need a pressure from each cylinder, and the pressure substitution allows the engine to carry on without going into limp mode.

 

[dweisel]

That would make sense. Thanks for the explaination.

dweisel

 

[n1das]

Freeze Frame:
RPM: 4301 /min
Speed: 73.0 km/h
Bin. Bits: 00001000
Absolute Pres.: 255.0 bar
(no units): 12.70
Ign. Timing: 0.9 °BTDC
(no units): 4.40

A pressure reading of 255.0 bar looks suspicious, like the output is pegged at full scale (max).

 

[biby]

A pressure reading of 255.0 bar looks suspicious, like the output is pegged at full scale (max).

Yes I bet that means either a short or open circuit, as 255 is the maximum value for a 2-digit hex number. (FF)

And I agree with Andy about the situation. The car does run the same as before.

 

[andy7079]

005079 - Cylinder 4 Internal Pressure Sensor: Short to Plus...Absolute Pres.: 255.0 bar

Definitely sounds like a short.
Something else to ponder: the glow plug tips can move up to 4mm. I don't think we've seen many go bad, but anything that moves will eventually wear out. It will be interesting to see what the service life on these glow plugs turns out to be.

 

[dpg]

good info here thanks everyone

 

[biby]

Definitely sounds like a short.
Something else to ponder: the glow plug tips can move up to 4mm. I don't think we've seen many go bad, but anything that moves will eventually wear out. It will be interesting to see what the service life on these glow plugs turns out to be.

I never knew they actually move. I thought they are mounted on the cylinder heads. Anyway I visited the dealership this morning and they changed the glow plug under warranty while I had some breakfast in the mcdonalds next door. Hope the error never comes back.

 

[740GLE]

internally the plunger (tip) moves, nothing should move on the top of the cylinder heads. Either way, with all the vibration chaffing is gonna happen at some point.

 

[dweisel]

CR INJECTOR

 

[bkrahmer]

I got these two exact faults on my xmas trip from CO -> MN. It took about 500 miles of driving with very bad mileage (35) before the codes finally set. My dad & I cleared the codes before I headed back to CO, assuming they would reset right away, or the problem was a fluke. On the way back through Iowa, the car would shudder very badly under full acceleration while cruising in 5th or 6th. It took about 900 miles before the codes set again. One dealer replaced the #4 glow plug/sensor. The codes came back again, this time on #3, and the dealer swapped #3 & #4 this time. There are still lingering drive-ability issues, but it won't set a code. I'm going to see if the dealer will replace the #4 one again and see what happens.

This car is not giving me much confidence. In 10k miles, I've had a bricked radio, two airbags gone out, 2 glowplug/sensors gone out, and several squeaks and rattles inside the car. My '03 ALH went 110k miles over 8 years with only two small problem that cost < $200 to fix (and NO squeaks).

 

[740GLE]

They'd be darwin winners if they replaced #4 GP, for what the 3rd time? expecting to fix that issue.

 

[quailallstar]

I got these same fault codes on my 2011 TDI Golf


2 Faults Found:

005079 - Cylinder 4 Internal Pressure Sensor
P13D7 - 000 - Short to Plus - Intermittent - MIL ON
Freeze Frame:
Fault Status: 10100000
Fault Priority: 2
Fault Frequency: 3
Mileage: 61551 km
Time Indication: 0
Date: 2016.14.04
Time: 20:31:56

Freeze Frame:
RPM: 1679 /min
Speed: 100.0 km/h
Bin. Bits: 00001010
Absolute Pres.: 240.0 bar
(no units): 10.40
Ign. Timing: 0.5 °BTDC
(no units): 6.00

005081 - Cylinder 4 Internal Pressure Sensor
P13D9 - 003 - Implausible Signal - Intermittent - MIL ON
Freeze Frame:
Fault Status: 10100011
Fault Priority: 2
Fault Frequency: 2
Mileage: 61556 km
Time Indication: 0
Date: 2016.14.04
Time: 20:35:12

Freeze Frame:
RPM: 1518 /min
Speed: 90.0 km/h
Bin. Bits: 00001010
Absolute Pres.: 53.0 bar
(no units): 11.50
Ign. Timing: 0.0 °BTDC
(no units): 6.00

 

[JSWTDI09]

I got these same fault codes on my 2011 TDI Golf

I just replied to the other thread you posted this in.

http://forums.tdiclub.com/showpost.php?p=3905648&postcount=22

Have Fun!

Don