Not your normal P0118 coolant sensor fault

   #1  

AudiDave

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Hi everyone, reasonable shade tree mechanic, new vag-com user here. I have a 2007 Audi A4 2.0T quattro cabriolet. I just changed the cooling flange (fun job) and the temperature sensor and sensor wiring harness clip. After the job I started getting P0118-002 signal too high. Coolant temperature reading is showing -40.0 C. Unfortunately I'd already tossed the old sensor so I swapped the new after market with a genuine Audi one with the same result. I checked the voltage at the harness, 4.71 volts, and the resistance of both of the temperature sensors, around 1640 at room temperature and they responded to changing temperatures. Other: engine temperature gauge work normally, car rough at startup, clear codes and they come back no matter if the car is hot or cold, temperature reading is -40.0C no matter if the engine is hot or cold. Car runs rough at startup, fans running at 88% duty cycle(!). Earlier this summer I did the time belt replacement including all the usual bits including the thermostat, all OEM parts. Any ideas based on this information? My only other thought is that -40C might be what shows up when the control module sees infinite impedance. Being I changed the clip (dealer OEM) could the sensor pins not be engaging the clip terminals? Any ideas how I could verify I'm getting proper engagement and completing the circuit? Thanks for any help, glad to be here and part of the group.

Can't figure out how to post the scan, so it's inserted below:

Code:
Sunday,03,December,2017,12:15:32:38656

VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64

VCDS Version: 17.8.0.1 (x64)  HEX-V2 CB: 0.4401.4

Data version: 20170721 DS276.2

www.Ross-Tech.com





VIN: WAUDF48H87K036287   License Plate: 

Mileage: 232700km-144593mi   Repair Order: 123







--------------------------------------------------------------------------------

--------------------------------------------------------------------------------





Chassis Type: 8H (8E - Audi A4/S4/RS4 B6/B7 (2001 > 2008))

Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 36 37 45 46 55 56 57 65

          67 69 75 76 77

 

VIN: WAUDF48H87K036287   Mileage: 232700km-144593miles

-------------------------------------------------------------------------------

Address 01: Engine        Labels:. 06F-907-115-AXX.clb

   Part No SW: 8E1 910 115     HW: 8E0 907 115 D

   Component: 2.0l R4/4V TFSI     0030  

   Revision: 5EH15---    Serial number:               

   Coding: 011C010A190F0120

   Shop #: WSC 00672 785 00200

   VCID: 5F9B5DD39B34ECFF020-800A



1 Fault Found:

000280 - Engine Coolant Temp. Sensor (G62) 

               P0118 - 002 - Signal too High - MIL ON

             Freeze Frame:

                    Fault Status: 11100010

                    Fault Priority: 0

                    Fault Frequency: 1

                    Reset counter: 255

                    Mileage: 232697 km

                    Time Indication: 0



             Freeze Frame:

                    RPM: 0 /min

                    Load: 0.0 %

                    Speed: 0.0 km/h

                    Temperature: -40.0°C

                    Temperature: 22.0°C

                    Absolute Pres.: 1010.0 mbar

                    Voltage: 12.446 V



Readiness: 0110 0101



-------------------------------------------------------------------------------

Address 02: Auto Trans        Labels: 09L-927-760.lbl

   Part No SW: 8E1 910 156 K    HW: 09L 927 156 B

   Component: AG6 09L 2,0TFSI USA 0050  

   Revision: --H01---    Serial number:        4314580

   Coding: 0000002

   Shop #: WSC 00000 000 00000

   VCID: 2F3BED13AB143C7FF20-807A



No fault code found.



-------------------------------------------------------------------------------

Address 03: ABS Brakes        Labels: 8E0-910-517.clb

   Part No SW: 8E0 910 517 J    HW: 8E0 614 517 BH

   Component: ESP8 quattro    H06 0140  

   Revision: 00000000    Serial number: 00000000000000

   Coding: 0004528

   Shop #: WSC 00672 785 00200

   VCID: 2E05F017AC1E3577F96-807A



No fault code found.



-------------------------------------------------------------------------------

Address 08: Auto HVAC        Labels: 8E0-820-043.lbl

   Part No: 8E0 820 043 BM

   Component:   A4 Klimaautomat   3233  

   Coding: 00100

   Shop #: WSC 00672  

   VCID: 6D87371B64888E6F80C-5118



No fault code found.



-------------------------------------------------------------------------------

Address 09: Cent. Elect.        Labels: 8E0-907-279-8EC.lbl

   Part No: 8E0 907 279 N

   Component: int. Lastmodul  USA 0907  

   Coding: 21023

   Shop #: WSC 00000  

   VCID: 3D27C75B7468DEEF70C-4AA4



1 Fault Found:

01503 - Bulb for 3rd Brake Light (M25) 

            30-00 - Open or Short to Plus



-------------------------------------------------------------------------------

Address 15: Airbags        Labels: 8H0-959-655-94.lbl

   Part No SW: 8H0 959 655 F    HW: 8H0 959 655 F

   Component:    Airbag 9.42  H10 1830  

   Revision: 92H10183    Serial number: 0037Z0008A6Q  

   Coding: 0132105

   Shop #: WSC 00672 785 00200

   VCID: 3D27C75B7178DEEF70C-8068



   Subsystem 1 - Part No: 8H0 910 339 B

   Component: BF-Gewichtsens. H02 0020



   Subsystem 2 - Serial number: 00QKN         



   Subsystem 3 - Serial number: 0001.01.0000H0200000000000ÿ†63



   Subsystem 4 - Serial number: 000000ÿ†6332BRB4024B30F0Gÿ†63



   Subsystem 5 - Serial number: B30F0Gÿ†6342BRB4024B30E1Hÿ†63



   Subsystem 6 - Serial number: B30E1Hÿ†63729RB4024E032CKÿ†63



   Subsystem 7 - Serial number: E032CKÿ†63829RB4024E0353Fÿ



   Subsystem 8 - Serial number: E0353Fÿ



No fault code found.



-------------------------------------------------------------------------------

Address 16: Steering wheel        Labels: 8E0-953-549.lbl

   Part No: 8E0 953 549 Q

   Component: Lenksáulenmodul     0701  

   Coding: 03041

   Shop #: WSC 00672  

   VCID: 41DFBBAB0890BA0F144-4AA4



No fault code found.



-------------------------------------------------------------------------------

Address 17: Instruments        Labels: 8E0-920-9xx-8EC.lbl

   Part No SW: 8H0 920 951 F    HW: 8H0 920 951 F

   Component: KOMBI+WFS 4     H14 0200  

   Revision: 0200        Serial number: 00000000000000

   Coding: 0007261

   Shop #: WSC 03129 444 59299

   VCID: 3039EE6FB63A2387EBA-50F4



No fault code found.



-------------------------------------------------------------------------------

Address 25: Immobilizer        Labels: 8E0-920-9xx-8EC.lbl

   Part No SW: 8H0 920 951 F    HW: 8H0 920 951 F

   Component: KOMBI+WFS 4     H14 0200  

   Revision: 0200        Serial number: 00000000000000

   Coding: 0007261

   Shop #: WSC 03129 444 59299

   VCID: 3039EE6FB63A2387EBA-50F4



No fault code found.



-------------------------------------------------------------------------------

Address 46: Central Conv.        Labels:. 8E0-959-433-MAX.clb

   Part No: 8H0 959 433 L

   Component: Komfortgerát T7B    5542  

   Coding: 11788

   Shop #: WSC 12398  

   VCID: 3D27C75B7468DEEF70C-4AA4



   Subsystem 1 - Part No: 8H1959801D

   Component: Tõrsteuer.FS BRM 0205  



   Subsystem 2 - Part No: 8H1959802D

   Component: Tõrsteuer.BF BRM 0205  



   Subsystem 3 - Part No: 8H0959801A

   Component: Tõrsteuer.HL BRM 0002  



   Subsystem 4 - Part No: 8H0959802A

   Component: Tõrsteuer.HR BRM 0002  



2 Faults Found:

01368 - Alarm triggered by Luggage Compartment Switch 

            35-00 -  - 

01369 - Alarm triggered by Hood Switch 

            35-00 -  - 



-------------------------------------------------------------------------------

Address 55: Headlight Range        Labels: 4F0-910-357.lbl

   Part No SW: 4F0 910 357 F    HW: 4F0 907 357 F

   Component: AFS 1           H01 0020  

   Revision: 00000001    Serial number:               

   Coding: 0000019

   Shop #: WSC 00672 785 00200

   VCID: 290F030B95F0524F2C4-807C



   Subsystem 1 - Part No: 8E0 941 329 A

   Component: AFS-Modul links H04 0020



   Subsystem 2 - Part No: 8E0 941 329 A

   Component: AFS-Modul rechtsH04 0020



No fault code found.



-------------------------------------------------------------------------------

Address 77: Telephone        Labels: 8P0-862-335.lbl

   Part No SW: 8P0 862 335 J    HW: 8P0 862 335 J

   Component: FSE_255x BT     H26 0290  

   Revision: 00000000    Serial number: 00000005026437

   Coding: 0001607

   Shop #: WSC 00672 785 00200

   VCID: 3D27C75B7168DEEF70C-50D0



No fault code found.



End----------(Elapsed Time: 05:00, VBatt start/end: 13.0V/12.7V)-----------
 
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   #2  

Uwe

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Broken wire in harness?

-Uwe-
 
   #3  

Jetta 97

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It is possible that you swap wires form pin 1 to 2.
You should have Brow/Black and Brown /Gray wire
Brown/Black is Pin 1 ( ground )
Brown /Gray is pin 2 ( ECU signal wire)
 
   #4  

AudiDave

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If the wire were broken I wouldn't be getting voltage, or at least stable voltage, and that isn't the case. Confirmed with Audi when I picked up the parts that with two pin it doesn't make a difference which wire to which pin. Thanks for the ideas...
 
   #5  

Jetta 97

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If the wire were broken I wouldn't be getting voltage, or at least stable voltage, and that isn't the case. Confirmed with Audi when I picked up the parts that with two pin it doesn't make a difference which wire to which pin. Thanks for the ideas...

Yes it does matter , you can not chnage pin 1 with pin 2,So make sure you have this correct , I gave you color with pin out.
You ask here for help , I am giving you help.

JACKKKKKKKKK were are you :D?
 
   #6  

HMC

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Hi Audidave,
Minus 40 degrees is a default, almost certainly you have an open circuit wire, probably the signal wire. Check the circuit at the ECU pins using the correct wiring diagram. Jack will be here soon saying FOD :)
Regards HMC
 
   #7  

Vasco Ferraz

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If the wire were broken I wouldn't be getting voltage, or at least stable voltage, and that isn't the case. Confirmed with Audi when I picked up the parts that with two pin it doesn't make a difference which wire to which pin. Thanks for the ideas...

-40ºC means an open circuit.
But you get a voltage readings in the terminals, so, cables should be ok.
Keep in mind that you swapped cables.
So, what could be causing an open circuit?

 
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   #8  

vwtech

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Like all said open circuit between ECU & CTS.
You need to check both wires from sensor to ECU pins.
Or totally open sensor but not two of them?
If you disconnect the sensor that's an open circuit and the ECU defaults the temp -40*C that's why everyone is telling you open circuit.

Good Luck
 
   #9  

Jack@European_Parts

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   #10  

Larry Manton

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But, But, But the dealer said it doesn not matter.

Larimore
 
   #12  

Jack@European_Parts

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Hey......! :thanks: I'm a parts guy & just an asshole that thinks he knows very little.


OP: You can indeed have voltage, as a result of insufficient current & from one strand of wire being what I call, an asshole current displaying voltage condition.

Asshole grounds or B+ , with inability to carry current, are indeed a real scenario.

Load test the track to be authenticated with meter or load light.

I name these conditions after me because when you finally find this, you will indeed feel like an asshole.

NostraJackAss Has Spoken!
 
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   #13  

AudiDave

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Hey, don't get me wrong, I appreciate the help, I'm just trying to work through it so I understand rather than just monkey see monkey do. I got in the pin release tool today and about to head out into the snow to swap the wires. For the record, is pin 1 next to the squared off side or the rounded side of the sensor?
 
   #15  

noyesclt

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Nice write up. In addition to what is written above. A loose connector can also cause this. In my case a previous owner had broken the retention clip on the sensor. I had installed a new sensor, it worked until I started the car again. It had some loose just in one start.. I pushed it back on.. worked.. then did same thing.

Also a you may want to consider using VCDS and then selecting advanced measurement. Search for temperature. Is it reading?

The solution for a broken retention clip is to 1) Install a new one or 2) find a way to repair existing or 3) wire in a figure 8 pattern (for temp fix).
 
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