Wiring diagram for engine mounts

[sannouni]

where can i get the wiring diagram for the Engine mounts (especially the driver side one) ? any help or guidance is appreciated.
2009 Audi A4 B8 Wagon, CAEB engine

[Gunnark100]

Go to https://erwin.audi.com/erwin/showHome.do, register, sign, pay and download all stuff for your car.

Left solenoid is connected to the ecu t94 pin 53 and other pin is connected to engine main harness connection nr13(d115).

[sannouni]

Thanks Gunnark100, I've been hunting a cold misfire for a while now. I've done all the logical steps that I can think of.
It's getting desperate, every cold start, I get multiple cylinder misfires and cylinder 1 and cylinder 4 until rpm drops from the cold start 1200 to the normal ~800RPM
The wiring for the steering (servotronic solinoid), which I had a problem with (since the car went to a garage to get the pistons replaced, it seems like they forgot to unplug some wires when they pulled out the engine) shares a conduit with the engine mount wiring on the driver side. The steering servotronic wiring was working intermittently, I had to splice in new wires and run them to the ECU box (firewall area) to resolve the issue.
The engine mount wiring on the driver side connects to the same conduit as the servotronic solenoid, which makes me think that there might be issues with the engine mount wires as well... I just wanted to eliminate that issue (the wiring problem) altogether.

Should there be voltage at the engine mount connector (When ignition or engine is on)??

[Gunnark100]

Should there be voltage at the engine mount connector (When ignition or engine is on)??

Sry i dont know, but if color code is correct, pin1 should be terminal 15(ignition on), but i could be wrong.

Edit:fuse diagram shows terminal 87, not 15!

[Smac770]

On the motor mounts, pin 1 connects to 12v (red/yellow wire) and pin 2 connects to the ECM (the other wire). ECM grounds the connection when it wants current flowing.
Unfortunately, the wiring diagram is missing the entry for the N145 right side mount, so one cannot be sure where that wire connects to the ECM.
The active mounts are only present for automatic transmission vehicles.
They are very simple and you'd have a DTC if there was any issue with the current flow, I would expect.

I don't know if high idle counts as driving mode or still idle mode (the doc, which is for another Audi has the changeover point from soft (idle) to hard (drive) as 1100rpm), nor if current is flowing for soft or hard mode.

The 12v source for the motor mounts is shared with a number of other devices that are also ground controlled at the ECM.
That's fuse 7 in the row of little fuses in the fuse panel at the ECM.
The exhaust cam adjustment actuators are on that same fuse.

The coils are on fuse 8.
The fuel injectors are wired to the ECM on both ends.

Have you checked the knock sensor voltages during the high idle to see if they indicate any difference or similarity across the cylinders?
I have a high value on cylinder 2 vs the others. But I assume it to be because when I changed my manifold, I manually cleaned the carbon build up except on 2, since it was the open one and I didn't know at the time about turning the engine manually to close it. I'm not sure if knock detection is active during that initial high idle, though.

[sannouni]

Thanks Gunnark100, I did a continuity test using a multimeter on the Engine mount wire that connects to the ECM and found zero resistance (but there is no guarantee that they dont leak, in other words, cross touch another bare wire at some point), i removed the wires from the conduit and traced them back two junctions, and didnt find any fretting or visible damage.

the (yellow/red wire) you mentioned it connects to terminal 87. where is terminal 87??

using the multimeter (after disconnecting the battery of course), i traced the yellow/red wire to the fusebox in the ECU box (firewall area) and found continuity (zero resistance) on the majority of the fuses (the rest were showing resistance but not infinite), is that normal ??

Note: the Servotronic solenoid wires also showed continuity but they were definitely not working as they should, when new wires were spliced, the solenoid worked perfectly since (hence my theory about bare wires touching somewhere, the wires from the Servotronic solenoid and the engine mount share the same condiut)

Smac770, Thank you for the information, mine is an automatic (active mounts) can the engine mount have a wiring issue but still function and not throw a code?

I used the information you provided about the fuses at the ECM box to find that what i mentioned above (continuity found between the yellow/red wire and most of the fuses in that row)

Any help or input in appreciated.

[sannouni]

Purchased the wiring diagram (thanks Gunnark 100 and Smac770 for the information)

I still cant find where terminal 87 is ... i searched both electrical system service manual, and wiring diagram documents downloaded from erWin. 2009 A4 Avant Automatic.

thanks.

[Gunnark100]

Terminal 87 is so to say 12v source for fuses like nr7. Where it starts no idea. But if all functions which are under fuse 7 work, no point to even waste your time to finding it. Any chance you post fresh autoscan?

[sannouni]

Thanks Gunnark100, below is the most recent scan:

Thursday,21,February,2019,20:13:54:00007
VCDS --
VCDS Version: 18.9.
Data version: 20180927 DS296.0



VIN: WAUVF68K49A145821 License Plate:


Chassis Type: 8K-AU48 (8T0)
Scan: 01 02 03 05 08 09 15 16 17 19 2E 36 42 46 47 52 53 55 56 62
6D 72 77

VIN: WAUVF68K49A145821 Mileage: 138540km-86084miles

01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
2E-Media Player 3 -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
6D-Trunk Elect. -- Status: Malfunction 0010
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine (DL0MA-CAEB) Labels:| 06H-907-115-CAB.clb
Part No SW: 8K2 907 115 AL HW: 8K2 907 115 D
Component: 2.0l R4/4V TF H14 0001
Revision: E1H14---
Coding: 010C010A190F0160
Shop #: WSC 25732 001 1048576
ASAM Dataset: EV_ECM20TFS0118K2907115AL 001001
ROD: EV_ECM20TFS0118K2907115AL.rod
VCID: 79F95BE5F8D9558292-802C

3 Faults Found:
4054 - Cylinder 1
P0301 00 [175] - Misfire Detected
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 138543 km
Date: 2019.02.21
Time: 20:04:17

Engine speed: 1206.00 /min
Normed load value: 20.8 %
Vehicle speed: 0 km/h
Coolant temperature: 24 °C
Intake air temperature: 13 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 12.439 V
Unlearning counter according OBD: 40

4063 - Cylinder 4
P0304 00 [175] - Misfire Detected
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 138543 km
Date: 2019.02.21
Time: 20:04:17

Engine speed: 1206.00 /min
Normed load value: 20.8 %
Vehicle speed: 0 km/h
Coolant temperature: 24 °C
Intake air temperature: 13 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 12.439 V
Unlearning counter according OBD: 40

4051 - Random/Multiple Cylinder Misfire Detected
P0300 00 [175] - -
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 138543 km
Date: 2019.02.21
Time: 20:04:15

Engine speed: 1195.50 /min
Normed load value: 21.6 %
Vehicle speed: 0 km/h
Coolant temperature: 24 °C
Intake air temperature: 14 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 12.156 V
Unlearning counter according OBD: 40

Readiness: 1110 0101

-------------------------------------------------------------------------------
Address 02: Auto Trans (J217) Labels:| 0B6-927-156.clb
Part No SW: 8K0 927 158 C HW: 0B6 927 156
Component: 0B6 20TFSIUSA H04 0050
Revision: --H04---
Coding: 001002
Shop #: WSC 06325 000 00000
ASAM Dataset: EV_TCMAL651 A01004
ROD: EV_TCMAL651.rod
VCID: 366390D989477AFA3F-8062

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104) Labels:. 8K0-907-379-V1.clb
Part No SW: 8K0 907 379 AB HW: 8K0 907 379 AB
Component: ESP8 quattro H04 0060
Revision: -------- Serial number: --------------
Coding: 150500
Shop #: WSC 06325 000 00000
VCID: 79F95BE5F0D9558292-802C

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393) Labels:. 8K0-907-064-05.clb
Part No SW: 8K0 907 064 CS HW: 8K0 907 064 CS
Component: BCM2 2.0 H06 0435
Revision: 00002001
Coding: 090200
Shop #: WSC 49615 000 1048576
VCID: 0305390D82151F52C8-8056

Subsystem 1 - Part No SW: 8T0 959 754 A HW: 8T0 959 754 A
Component: FBSAUDIB8 IDG H37 0060
Serial number: 0508000053940002

Subsystem 2 - Part No SW: 8K0 905 852 D HW: 8K0 905 852 D
Component: ELVAUDIB8 H36 0041
Serial number: 0208000070124006

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255) Labels:. 8Tx-820-043-3Z.clb
Part No SW: 8T1 820 043 AC HW: 8T1 820 043 AC
Component: KLIMA 3 ZONEN H06 0140
Revision: C1000000 Serial number: 0129.09.081408
Coding: 64002000
Shop #: WSC 06325 000 00000
VCID: 72EB6CC9ADAF26DAD3-8026

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519) Labels:. 8K0-907-063.clb
Part No SW: 8K0 907 063 D HW: 8K0 907 063 D
Component: BCM1 1.0 H22 0253
Revision: 05022001 Serial number: 00000000132458
Coding: 26001097473CAF010000080300003D0D0F1C47080001014100 0000
Shop #: WSC 06325 000 00000
VCID: 306FA6C1632354CA65-8064

Subsystem 1 - Part No SW: 8K1 955 119 A HW: 8T1 955 119 Labels: 1KX-955-119.CLB
Component: WWS 021008 H06 0070
Serial number: SWF08100026194
Coding: 00FD11

Subsystem 2 - Part No SW: 8K0 955 559 HW: 8K0 955 559 Labels: 8K0-955-559.CLB
Component: RLS H04 0003
Serial number: 10275432
Coding: 025028

Subsystem 3 - Part No SW: 8K0 941 531 G HW: 8K0 941 531 G
Component: E1 - LDS H07 0070
Serial number: 00000000003009080691

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234) Labels:* 8K0-959-655.clb
Part No SW: 8K0 959 655 F HW: 8K0 959 655 F
Component: AirbagVW-AU10 H27 0410
Serial number: 0039KD149BP9
Coding: 30453635423030303030554A304C384B3053
Shop #: WSC 06335 000 00000
ASAM Dataset: EV_AirbaECUVWAUDI010 A02007
ROD: EV_AirbaECUVWAUDI010_A02.rod
VCID: 408FF601DB83C44A95-8014

Crash sensor for side airbag: driver side:
Serial number: 6334MSME4035046B6

Crash sensor for side airbag: front passenger side:
Serial number: 6344MSME421615586

Crash sensor for side airbag: rear: driver side:
Serial number: 6352QSME140C25269

Crash sensor for side airbag: rear: passenger side:
Serial number: 6362QSME63075338D

Crash sensor for front airbag: driver side:
Serial number: 63732SME7C0A3E1AD

Crash sensor for front airbag: front passenger side:
Serial number: 63832SME210C1602O

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527) Labels:. 8K0-953-568.clb
Part No SW: 8K0 953 568 F HW: 8K0 953 568 F
Component: Lenks.Modul H13 0013
Revision: -------- Serial number: 90319HIU0009F
Coding: 000017
Shop #: WSC 06325 000 00000
VCID: 3D718FF5A471A9A2FE-8068

Component: E221 - MFL H02 0003

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285) Labels:. 8T0-920-xxx-17.clb
Part No SW: 8K0 920 900 HW: 8K0 920 900
Component: KOMBIINSTR. H17 0224
Revision: 00000000 Serial number: 9DL1CEX98
Coding: 8307110002000008020000
Shop #: WSC 06325 000 00000
VCID: 67DD0D9D966DD37274-8032

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533) Labels:. 8T0-907-468.clb
Part No SW: 8T0 907 468 H HW: 8T0 907 468 H
Component: GW-BEM 5CAN H06 0094
Revision: 4GB20042 Serial number: 4200G089078185
Coding: 000303
Shop #: WSC 06325 000 00000
VCID: 4683E019F1A7EA7AAF-8012

Subsystem 1 - Part No SW: 8K0 915 181 B HW: 8K0 915 181 B
Component: J367-BDM H04 0150
Serial number: 18045FA4140908

No fault code found.

-------------------------------------------------------------------------------
Address 2E: Media Player 3 (R199) Labels:. 8T0-035-785.clb
Part No SW: 8T0 035 785 HW: 8T0 035 785
Component: SG ext.Player H06 0210
Revision: 00000000
Coding: 020302
Shop #: WSC 06325 000 00000
VCID: 78FF5EE1CBD34C8AED-802C

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr (J136) Labels:. 8T0-959-760.clb
Part No SW: 8K0 959 760 HW: 8K0 959 760
Component: MEM-FS H05 0043
Revision: AA000000 Serial number: 00001001156914
Coding: 00581300000000000000
Shop #: WSC 15216 002 1048576
VCID: 77FD5DDDC6CD43F2E4-8022

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386) Labels:. 8K0-959-793.clb
Part No SW: 8K0 959 793 B HW: 8K0 959 793
Component: TSG FA H10 0170
Revision: Serial number: 0000007773422
Coding: 011C03204E00410001
Shop #: WSC 06325 000 00000
VCID: 3F8DF5FDAE7DBBB2EC-806A

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. (J393) Labels:. 8K0-907-064-46.clb
Part No SW: 8K0 907 064 CS HW: 8K0 907 064 CS
Component: BCM2 2.0 H06 0435
Revision: 00002001 Serial number: 0300122525
Coding: 0126063A207A341400B0020000000000
Shop #: WSC 49615 000 104857
VCID: 0305390D82151F52C8-8056

Subsystem 1 - Part No: 1K0 951 605 C
Component: LIN BACKUP HO H03 1301

Subsystem 2 - Part No SW: 8K0 959 591 A HW: 8K0 959 591
Component: J245 PS133 H06 0041

Subsystem 3 - Part No SW: 8K0 959 591 HW: 8K0 959 591
Component: J394 PS222 H06 0037

No fault code found.

-------------------------------------------------------------------------------
Address 47: Sound System (J525) Labels:. 8T0-035-223-ASC.clb
Part No SW: 8T0 035 223 AB HW: 8T0 035 223
Component: DSP STD H07 0220
Revision: S2100000
Coding: 0203010102
Shop #: WSC 06325 000 00000
VCID: 6ED378B9B997023A37-803A

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387) Labels:. 8K0-959-792.clb
Part No SW: 8K0 959 792 B HW: 8K0 959 792
Component: TSG BF H10 0170
Revision: Serial number: 0000007776071
Coding: 011C03205E00410001
Shop #: WSC 06325 000 00000
VCID: 3E7388F9A977B2BAE7-806A

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake (J540) Labels: 8K0-907-801-V1.clb
Part No SW: 8K0 907 801 E HW: 8K0 907 801 E
Component: EPB Audi B8 H05 0060
Revision: 00000003 Serial number: 10000000108098
Shop #: WSC 00000 000 00000
VCID: 3169A3C568295DC26A-8064

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range Labels: 8K0-907-357.clb
Part No: 8K0 907 357 B
Component: Dynamische LWR H01 0030
Revision: 00000001 Serial number:
Coding: 0000004
Shop #: WSC 06334 000 00000
VCID: 3467AAD1573B68EA01-8060

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (J503) Labels:. 8Tx-035-1xx-56.clb
Part No SW: 8T1 035 195 L HW: 8T1 035 195 L
Component: Symph3 Sirius H02 0211
Revision: 00000004 Serial number: AUZ5Z4H1052113
Coding: 240200020102870303D9070800
Shop #: WSC 06335 000 00000
VCID: 408FF601D383C44A95-8014

Subsystem 1 - Part No SW: 8T0 919 603 A HW: 8T0 919 603 A
Component: Display

2 Faults Found:
02633 - Antenna for Satellite Tuner
011 - Open Circuit
Freeze Frame:
Fault Status: 01101011
Fault Priority: 5
Fault Frequency: 1
Reset counter: 236
Mileage: 136720 km
Time Indication: 0
Date: 2019.02.08
Time: 22:19:35

02635 - Tuner Not Enabled/Activated
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 7
Fault Frequency: 1
Reset counter: 236
Mileage: 136720 km
Time Indication: 0
Date: 2019.02.08
Time: 22:19:35


-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388) Labels:. 8K0-959-795.clb
Part No SW: 8K0 959 795 HW: 8K0 959 795
Component: TSG HL H06 0170
Revision: Serial number: 0000007799973
Coding: 010C03204000210001
Shop #: WSC 06325 000 00000
VCID: 7F0DB5FDEEFD7BB2AC-802A

No fault code found.

-------------------------------------------------------------------------------
Address 6D: Trunk Elect. (J605) Labels: Redir Fail!
Part No SW: 8K9 827 851 HW: 8K9 827 851
Component: J605 Master H27 0240
Revision: -------- Serial number: 8K9827851
VCID: 7BF541EDFAE5679280-802E

Subsystem 1 - Part No SW: 8K9 827 852 HW: 8K9 827 852
Component: J756 Slave H27 0240
Serial number: 8K9827852

1 Fault Found:
16347 - Control Module - EEPROM Error
014 - Defective
Freeze Frame:
Fault Status: 01101110
Fault Priority: 1
Fault Frequency: 1
Reset counter: 218
Mileage: 136421 km
Time Indication: 0
Date: 2019.02.02
Time: 19:05:56


-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389) Labels:. 8K0-959-794.clb
Part No SW: 8K0 959 794 HW: 8K0 959 795
Component: TSG HR H06 0170
Revision: Serial number: 0000007785288
Coding: 010C03204000210001
Shop #: WSC 06325 000 00000
VCID: 7EF348F9E9F772BAA7-802A

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone Labels: 8P0-862-335.lbl
Part No SW: 8T0 862 336 C HW: 8T0 862 336 C
Component: FSE_256x BT H33 0550
Revision: 00000000 Serial number: 00000005020774
Coding: 0010370
Shop #: WSC 06325 000 00000
VCID: 3B7581ED7A65A792C0-806E

No fault code found.

End-------------------------(Elapsed Time: 03:37)--------------------------

[sannouni]

Update: very peculiar (to me), i tested voltage across the 2 old servotronic wires (that should no longer be connected to anything on both ends), and one of them is registering 3.XX Volts on it. any ideas?? sorry about the quality of the video...

[Gunnark100]

Update: very peculiar (to me), i tested voltage across the 2 old servotronic wires (that should no longer be connected to anything on both ends), and one of them is registering 3.XX Volts on it. any ideas?? sorry about the quality of the video...

As your servotronic works with new wiring, i cant see point of this test, but as you know n119 is connected to j519 via t17q plug which is ecu fusebox position G, but it does not share pins with other functions etc.

Btw, your scan looks not bad at all!

[sannouni]

Thanks Gunnark100, i was doing this test because i'm suspecting that the wires are chafed somewhere inside the conduit (the old green wires from the servotronic maybe touching some other wires in the conduit and causing voltage leaks? just a theory, are there other possibilities for one of the old wires to register voltage still, even after i cut both?)

[Gunnark100]

Thanks Gunnark100, i was doing this test because i'm suspecting that the wires are chafed somewhere inside the conduit (the old green wires from the servotronic maybe touching some other wires in the conduit and causing voltage leaks? just a theory, are there other possibilities for one of the old wires to register voltage still, even after i cut both?)

Engine bay wiring is not really my "thing", but anything is possible...are you able to remove those wires permanently(probably not- to much hassle). I remember one story, where flat battery of multimeter caused all sorts of faulty(unreal) readings, i hope thats not your case!

[Smac770]

Be sure to use the negative post on the driver's side shock tower to get a clean value to "ground". It's in the very bottom right corner of your video at time 67.187.
If you measure the voltage to 12v, using the positive post under the cover in the center of the plenum cover, do you measure the other 8.5v or so?
Two wires with two ends, so do you get the same results on all four points? Or just one wire, or just one end of one wire?

It is a curious thing, but unfortunately, I think you're only answer will be found after dismantling the conduit.
The wiring diagram provides a lot of info, but it does not convey actual wire routing.

[sannouni]

After capturing the video. I separated the two green wires, and it ended up being 1 of them that registered a voltage (not both of them). I dont have much training in pulling conduits out.is there a reference I can use? I made a mess when just tracing the wiring for the servotronic and engine mount (as you can see from the video and the others linked in the description section on YouTube).
Gunnark100, good point, I'll change the battery on the multimeter and retest.
Smac770, I'll use the fresh multimeter and test against the main ground terminal in the engine bay. And will report back with the main (terminal 30?) Voltage against a clean ground vs center of plenum.
Automotive wiring repair guide would help...

Can I use 3m electrical tape? When wrapping up the junctions (instead of that seemingly specialized tape used by Audi)
Thanks for all the help guys. Any advice is appreciated...

[sannouni]

OK this thing is really driving me mad...


The Engine wiring harness connectors (red and white) in the ECM Box (under windshield washer fill cap, in the firewall area), were WET. I dried everything and put it back together... and now the Green wires (that are supposed to not be connected to anything, because i have spliced in new wires effectively cancelling the original servotronic ones) registers 12VOLTS. seriously, this thing is very puzzling ..

can anyone shed some light into this please??

i don't have good electrical diagnostics skills, but to my limited knowledge, this is almost confirming a chaffing inside one of the conduits (especially the one that houses the Servotronic old wires, only one of them is registering 12 Volts by the way, the other is giving a Zero Volt)

[sannouni]

the problem was originating from the connector itself, i opened up the wire conduit and traced the wires and didn't find any evidence of chafing. as soon as i removed the pin from the connector (T17q red connector in the ECM box, in the firewall area), the voltage reading became 0 on both servotronic wires (old wires)...