Engine Fan Always Running

[freshwun]

I have a 2013 Audi A4 in which the engine fan runs in the following scenarios. I'd like to know how to narrow down the cause of this issue.

1. Right when I start it and will stay on as long as the engine is running.
2. The fan will stay on for 1-5 minutes after I turn off the car but I read this is normal.
3. When I open the door and wait about 10 seconds the fan will turn on for about 5 seconds and then go off.


I read this could be related to the ECU, thermostat, fan control module, or fan relay. I have a APR Stage2 tune which was flashed through the port so I'm not excluding an ECU issue. Most of the issues I have read are drivers that have their fan on even if the car is off. Like stated above, the fan does turn off after a few minutes when I turn off the car. I have no CEL but my VCDS scan pulled a 0480 fault code - Coolant Fan Control Circuit 1 and a few other unrelated faults.

Can someone help me troubleshoot this? The VCDS scan is below.


Thanks,

Doug


Chassis Type: FL (8R0)
Scan: 01 02 03 05 08 09 15 16 17 19 36 42 44 46 47 52 53 56 5F 62
6C 72

Mileage: 70070km-43539miles

01-Engine -- Status: Malfunction 1010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: Malfunction 0010
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: Malfunction 0010
19-CAN Gateway -- Status: Malfunction 0010
36-Seat Mem. Drvr -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: Malfunction 0010
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: Malfunction 0010
56-Radio -- Status: Malfunction 0010
5F-Information Electr. -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine (DET-CPMA) Labels: 06H-907-115-CDN.clb
Part No SW: 8K5 907 115 F HW: 8K2 907 115 L
Component: 2.0l R4/4V TF H09 0007
Revision: ECH09---
Coding: 4A2A0013242600062000
Shop #: WSC 44403 000 1048576
ASAM Dataset: EV_ECM20TFS0118K5907115F 001008
ROD: EV_ECM20TFS0118K5907115F.rod
VCID: 3561F197945BA1EA43-8060

1 Fault Found:
4527 - Coolant Fan Control Circuit 1
P0480 00 [047] - Electrical Malfunction
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 70040 km
Date: 2016.08.19
Time: 11:19:48

Engine speed: 792.00 /min
Normed load value: 25.5 %
Vehicle speed: 0 km/h
Coolant temperature: 79 °C
Intake air temperature: 40 °C
Ambient air pressure: 980 mbar
Voltage terminal 30: 13.499 V
Unlearning counter according OBD: 40
CAN status - engine control module-Bit 0: 0
CAN status - transmission control module-Bit 0: 0
CAN status - brake control module 1-Bit 0: 0
CAN status - brake control module 2-Bit 0: 0
selected gear-Bit 0: 0

Readiness: 0010 0101

-------------------------------------------------------------------------------
Address 02: Auto Trans (J217) Labels: 0BK-927-156.clb
Part No SW: 8K0 927 158 T HW: 0BK 927 156 AL
Component: 0BK 20TFSIUSA H16 1003
Revision: --H16---
Coding: 000002
Shop #: WSC 00000 000 00000
ASAM Dataset: EV_TCMAL551211 002020
ROD: EV_TCMAL551211_AU48.rod
VCID: 479D8B5FFEB7237A21-8012

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104) Labels: 8K0-907-379-V1.clb
Part No SW: 8K0 907 379 CK HW: 8K0 907 379 CK
Component: ESP8 quattro H09 0100
Revision: -------- Serial number: --------------
Coding: 2D1D18
Shop #: WSC 02391 823 56573
VCID: 04075C538701C86284-8050

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393) Labels: 8K0-907-064-05.clb
Part No SW: 8K0 907 064 FM HW: 8K0 907 064 FM
Component: BCM2 2.0 H10 0602
Revision: 00002001
Coding: 0D810000000000000000
Shop #: WSC 02399 823 56573
VCID: 000F50439319D442A0-8054

Subsystem 1 - Part No SW: 8K0 905 852 E HW: 8K0 905 852 E
Component: J764 ELV MLB H40 0046
Serial number: 2312000071773015

1 Fault Found:
01330 - Central Control Module for Central Convenience (J393)
013 - Check DTC Memory - Intermittent
Freeze Frame:
Fault Status: 00101101
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Time Indication: 0
Date: 2016.08.09
Time: 11:10:44


-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255) Labels: Redir Fail!
Part No SW: 8K1 820 043 N HW: 8K1 820 043 N
Component: KLIMA 3 ZONEN H04 0123
Revision: C1000000 Serial number: 01130420120539
Coding: 6480208000
Shop #: WSC 02391 823 56573
VCID: 3365CF8F922FBFDA6D-8066

1 Fault Found:
01314 - Engine Control Module
008 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Time Indication: 0
Date: 2016.08.09
Time: 11:10:43


-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519) Labels: 8K0-907-063.clb
Part No SW: 8K0 907 063 DH HW: 8K0 907 063 AH
Component: BCM1 1.0 H14 0103
Revision: 08014001 Serial number: 00000028760601
Coding: 26000091863CAFC00000480300003D0D0F1C5208A209022100 0008000000030100000030000000
Shop #: WSC 01837 002 1048576
VCID: 78FF38A3CBC99C8298-802C

Subsystem 1 - Part No SW: 8K1 955 119 A HW: 8T1 955 119 Labels: 1KX-955-119.CLB
Component: WWS 170412 H07 0070
Serial number: SWF12040175110
Coding: 00FD11

Subsystem 2 - Part No SW: 8U0 955 559 B HW: 8U0 955 559 B Labels: 8U0-955-559.CLB
Component: G397_RLFS H06 0002
Serial number: 20242771
Coding: 02005D

Subsystem 3 - Part No SW: 8K0 941 531 AS HW: 8K0 941 531 AS
Component: E1 - LDS H03 0031
Serial number: 00000000000304120860

Subsystem 4 - Part No SW: 4G0 907 410 A HW: 4H0 907 410 A
Component: USHL4.2 H30 0030
Serial number: 0000002274555R1G7G02

Subsystem 5 - Part No SW: 4H0 907 658 HW: 4H0 907 658
Component: AQ_Hum_Sensor H03 0003
Serial number: 92780326000000000001

1 Fault Found:
01314 - Engine Control Module
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Time Indication: 0
Date: 2016.08.09
Time: 11:10:44


-------------------------------------------------------------------------------
Address 15: Airbags (J234) Labels: 8K0-959-655.clb
Part No SW: 8K0 959 655 P HW: 8K0 959 655 P
Component: AirbagVW-AU10 H45 0610
Serial number: 003KJD903T5F
Coding: 303844354730303030304A55304C384B3053
Shop #: WSC 32235 002 1048576
ASAM Dataset: EV_AirbaECUVWAUDI010 003010
ROD: EV_AirbaECUVWAUDI010_AU48.rod
VCID: 4A9BB26BEDA5DE123E-801E

Seat occupied recognition:
Subsystem 1 - Part No SW: 8K0 959 339 C HW: 8K0 959 339 C
Component: BF-Gewichtss. H02 0040
Serial number: 5810000R1200008J32

Crash sensor for side airbag: driver side:
Serial number: 6334MSME6D054A2AN

Crash sensor for side airbag: front passenger side:
Serial number: 6344MSME6C646862O

Crash sensor for side airbag: rear: driver side:
Serial number: 6352QSME5212317A8

Crash sensor for side airbag: rear: passenger side:
Serial number: 6362QSME1D130958I

Crash sensor for front airbag: driver side:
Serial number: 63732SME0613184AW

Crash sensor for front airbag: front passenger side:
Serial number: 63832SME71123474T

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527) Labels: 8K0-953-568.clb
Part No SW: 8K0 953 568 L HW: 8K0 953 568 L
Component: Lenks.Modul H03 0004
Revision: -------- Serial number: 90372LDB000GE
Coding: 000036
Shop #: WSC 02391 823 56573
VCID: 43859F4FC28F0F5AFD-8016

Component: E221 - MFL H03 0003

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285) Labels: 8T0-920-xxx-17.clb
Part No SW: 8K0 920 982 A HW: 8K0 920 982 A
Component: KOMBIINSTR. H35 0540
Revision: 00000000 Serial number: NTC29934D
Coding: 8B3709000301D705020000
Shop #: WSC 02391 823 56573
VCID: 326BCA8B6D35B6D266-8066

1 Fault Found:
01314 - Engine Control Module
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Time Indication: 0
Date: 2016.08.09
Time: 11:10:44


-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533) Labels: 8T0-907-468.clb
Part No SW: 8R0 907 468 C HW: 8R0 907 468 C
Component: GW-BEM 4CAN-M H10 0025
Revision: 1Y030014 Serial number: 1441Y1241500A9
Coding: 00C303FF00
Shop #: WSC 02391 823 56573
VCID: 3F8D93BFAE676BBA99-806A

Subsystem 1 - Part No SW: 8T0 915 181 HW: 8T0 915 181
Component: J367-BDMHella H03 8041
Serial number: 1567047301

1 Fault Found:
01314 - Engine Control Module
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 2
Fault Frequency: 6
Reset counter: 24
Mileage: 69773 km
Time Indication: 0
Date: 2016.08.09
Time: 11:10:44

Freeze Frame:
Bin. Bits: 10111
Voltage: 12.40 V
Count: 6
Bin. Bits: 10000
Time: 25.40 s


-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr (J136) Labels: 8T0-959-760.clb
Part No SW: 8K0 959 760 D HW: 8K0 959 760 D
Component: MEM-FS H06 0076
Revision: AA000000 Serial number: 00000027616709
Coding: 00581B00000000000000
Shop #: WSC 02391 823 56573
VCID: 3B75E7AFBA7F779AB5-806E

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386) Labels: 8K0-959-793.clb
Part No SW: 8T0 959 793 G HW: 8T0 959 793 G
Component: TSG FA H09 0302
Revision: -------- Serial number: --------------
Coding: 011C13204E00410001
Shop #: WSC 02391 823 56573
VCID: 4D91B97714CBC92A1B-8018

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist (J500) Labels: 8K0-909-144.clb
Part No SW: 8K0 909 144 F HW: 8K0 909 144 B
Component: RCEPS H36 0507
Revision: 00001000 Serial number: 0030477553
Coding: 100000000001
Shop #: WSC 02101 444 125925
ASAM Dataset: EV_RCEPSAU48X 008014
ROD: EV_RCEPSAU48X.rod
VCID: 3467CC939F21B8E274-8060

1 Fault Found:
3158274 - Function Restricted due to Missing Message(s)
U1111 00 [008] - -
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Date: 2016.08.09
Time: 11:10:44

valid


-------------------------------------------------------------------------------
Address 46: Central Conv. (J393) Labels: 8K0-907-064-46.clb
Part No SW: 8K0 907 064 FM HW: 8K0 907 064 FM
Component: BCM2 2.0 H10 0602
Revision: 00002001 Serial number: 0174695901
Coding: 0106063A00FA400580B0013200000000
Shop #: WSC 02391 823 56573
VCID: 000F50439319D442A0-8054

Subsystem 1 - Part No SW: 8K0 959 719 B HW: 8K0 959 719
Component: GTO BF H01 0080
Serial number: 00000000000000512057

Subsystem 2 - Part No: 1K0 951 605 C
Component: LIN BACKUP HO H05 1501

Subsystem 3 - Part No SW: 8K0 959 591 B HW: 8K0 959 591
Component: J245 PS050 H08 0043

1 Fault Found:
01314 - Engine Control Module
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Time Indication: 0
Date: 2016.08.09
Time: 11:10:44


-------------------------------------------------------------------------------
Address 47: Sound System (J525) Labels: 8T0-035-223-BOM.clb
Part No SW: 8T1 035 223 A HW: 8T1 035 223 A
Component: DSP Prem H04 0030
Revision: 00004001 Serial number: 94814002588601
VCID: 2D51D9F7740BE92A3B-8078

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387) Labels: 8K0-959-792.clb
Part No SW: 8T0 959 792 G HW: 8T0 959 792 G
Component: TSG BF H09 0302
Revision: -------- Serial number: --------------
Coding: 011C13204E00410001
Shop #: WSC 02391 823 56573
VCID: 4C97B473EFD1C0220C-8018

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake (----) Labels: 8K0-907-801-V2.clb
Part No SW: 8K0 907 801 J HW: 8K0 907 801 J
Component: EPB-4 H01 0001
Revision: -------- Serial number: 30000000039035
ASAM Dataset: EV_ParkiBrake 001022
ROD: EV_ParkiBrake_VW51.rod
VCID: 3663F69B895DAAF24A-8062

5 Faults Found:
334080 - Function Restricted due to Missing Message(s)
U1111 00 [008] - -
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Date: 2016.08.09
Time: 11:10:43

Voltage terminal 30: 12.3 V
Internal Fault ID: 51
Vehicle speed: 0 km/h
Network management state: normal
Function light in parking brake button: OFF
Red operating lamp: OFF
Red warning lamp: OFF
Green operating lamp: OFF
Yellow warning lamp: OFF
Terminal 15 status: On
RWU: not active
DSD: not active
HTR: not active
ECD: not active
ACC requested apply: not active
Auto Adjust: not active
General Inspection Function: not active
Internal Parking Brake state: static
Status of parking brake button: Not operated
Status ParkingBrake left: Open
Status ParkingBrake right: Open

331264 - Function Restricted due to Missing Message(s)
U1111 00 [008] - -
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Date: 2016.08.09
Time: 11:10:43

Voltage terminal 30: 12.3 V
Internal Fault ID: 99
Vehicle speed: 0 km/h
Network management state: normal
Function light in parking brake button: OFF
Red operating lamp: OFF
Red warning lamp: OFF
Green operating lamp: OFF
Yellow warning lamp: OFF
Terminal 15 status: On
RWU: not active
DSD: not active
HTR: not active
ECD: not active
ACC requested apply: not active
Auto Adjust: not active
General Inspection Function: not active
Internal Parking Brake state: static
Status of parking brake button: Not operated
Status ParkingBrake left: Open
Status ParkingBrake right: Open

331520 - Function Restricted due to Missing Message(s)
U1111 00 [008] - -
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Date: 2016.08.09
Time: 11:10:43

Voltage terminal 30: 12.3 V
Internal Fault ID: 100
Vehicle speed: 0 km/h
Network management state: normal
Function light in parking brake button: OFF
Red operating lamp: OFF
Red warning lamp: OFF
Green operating lamp: OFF
Yellow warning lamp: OFF
Terminal 15 status: On
RWU: not active
DSD: not active
HTR: not active
ECD: not active
ACC requested apply: not active
Auto Adjust: not active
General Inspection Function: not active
Internal Parking Brake state: static
Status of parking brake button: Not operated
Status ParkingBrake left: Open
Status ParkingBrake right: Open

331776 - Function Restricted due to Missing Message(s)
U1111 00 [008] - -
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Date: 2016.08.09
Time: 11:10:42

Voltage terminal 30: 12.3 V
Internal Fault ID: 101
Vehicle speed: 0 km/h
Network management state: normal
Function light in parking brake button: OFF
Red operating lamp: OFF
Red warning lamp: OFF
Green operating lamp: OFF
Yellow warning lamp: OFF
Terminal 15 status: On
RWU: not active
DSD: not active
HTR: not active
ECD: not active
ACC requested apply: not active
Auto Adjust: not active
General Inspection Function: not active
Internal Parking Brake state: static
Status of parking brake button: Not operated
Status ParkingBrake left: Open
Status ParkingBrake right: Open

460800 - Function Restriction due to Faults in Other Modules
U1113 00 [008] - -
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Date: 2016.08.09
Time: 11:10:44

Voltage terminal 30: 12.3 V
Internal Fault ID: 144
Vehicle speed: 0 km/h
Network management state: normal
Function light in parking brake button: OFF
Red operating lamp: OFF
Red warning lamp: OFF
Green operating lamp: OFF
Yellow warning lamp: On
Terminal 15 status: On
RWU: not active
DSD: not active
HTR: not active
ECD: not active
ACC requested apply: not active
Auto Adjust: not active
General Inspection Function: not active
Internal Parking Brake state: static
Status of parking brake button: Not operated
Status ParkingBrake left: Open
Status ParkingBrake right: Open


-------------------------------------------------------------------------------
Address 56: Radio (R) Labels: Redir Fail!
Part No SW: 4G0 035 082 C HW: 4G0 035 082
Component: Radio U SIRIU H53 0101
Revision: AB001007 Serial number: 236D.0C7531693
Coding: 020007010000000001
Shop #: WSC 02391 823 56573
VCID: 204F30C333D9344280-8074

1 Fault Found:
03278 - Functionality Limited due to Missing Messages
000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 6
Fault Frequency: 1
Reset counter: 0
Mileage: 69773 km
Time Indication: 0
Date: 2016.08.09
Time: 11:10:48

Freeze Frame:
Bin. Bits: 00000000 00001000


-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794) Labels: 4E0-035-6xx-5F.clb
Part No SW: 8R1 035 746 A HW: 8R1 035 746 A
Component: H-BNT-NA H42 0422
Revision: -------- Serial number: 096D%0C7506854
Coding: 0F0200000006E1EF41028F4E00000403140000000000000000
Shop #: WSC 02391 823 56573
VCID: 3561F1979C5BA1EA43-8060

Subsystem 1 - Part No: 8R0 060 884 AD
Component: NAR 2011 0505

Subsystem 2 - Part No SW: 8R0 919 604 HW: 8R0 919 604
Component: DU7 High H41 0104
Serial number: A130CY0CS133211

Subsystem 3 - Part No SW: 8T0 919 611 C HW: 8T0 919 611 C
Component: E0380 Bedient H02 0020
Serial number: 00000001127334

Subsystem 4 - Part No: 8R0 060 961 B
Component: CD-Database 3371

2 Faults Found:
03157 - Functionality limited due to Communications Disruption
000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 6
Fault Frequency: 12
Reset counter: 24
Mileage: 70040 km
Time Indication: 0
Date: 2016.08.19
Time: 11:26:27

Freeze Frame:
Bin. Bits: 00000001 00000000
Bin. Bits: 00000000 00000000
Bin. Bits: 00000000 00000000
Bin. Bits: 00000000 00000000
Bin. Bits: 00000000 00000000

03278 - Functionality Limited due to Missing Messages
000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 6
Fault Frequency: 2
Reset counter: 0
Mileage: 69773 km
Time Indication: 0
Date: 2016.08.09
Time: 11:10:53

Freeze Frame:
Bin. Bits: 00010000 00000000
Bin. Bits: 00000000 00010000


-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388) Labels: 8K0-959-795.clb
Part No SW: 8T0 959 795 H HW: 8T0 959 795 H
Component: TSG HL H07 0302
Revision: -------- Serial number: --------------
Coding: 010C13204000210001
Shop #: WSC 02391 823 56573
VCID: 50AFA00303F9E4C270-8004

No fault code found.

-------------------------------------------------------------------------------
Address 6C: Back-up Cam. Labels: 8T0-907-441.clb
Part No SW: 8T0 907 441 C HW: 4L0 907 441 B
Component: J772__Rearview 0040
Revision: --H07--- Serial number: 525PA8-J23908F
Coding: 1000006
Shop #: WSC 02391 785 00200
VCID: 387FF8A34B495C8258-806C

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389) Labels: 8K0-959-794.clb
Part No SW: 8T0 959 795 H HW: 8T0 959 795 H
Component: TSG HR H07 0302
Revision: -------- Serial number: --------------
Coding: 010C13204000210001
Shop #: WSC 02391 823 56573
VCID: 50AFA00303F9E4C270-8004

No fault code found.

End-------------------------(Elapsed Time: 03:42)--------------------------

[BrewDude]

http://wiki.ross-tech.com/wiki/index...4/P0480/001152

[freshwun]

http://wiki.ross-tech.com/wiki/index...4/P0480/001152

Is there any way to verify it is the fan control module before purchasing it? I read a lot of fan control module issues cause the fan to always stay on until it drains your battery. Mine does turn off after the car is off for a few minutes.

[freshwun]

Update: Would I be correct in saying it's an ECU issue if my egine fan sometimes comes on for a few seconds after I open my door while the car is off? This is in addition to the fan always running while my car is running and running between 1-10 minutes after I turn off my car.

[van462]

In VCDS Module 1 engine go to measuring blocks and select blocks 38 and 39. These are what the ECU is commanding for fan speed. I had my A/C off and fan 1 was only reading 10% and fan 2 zero.

[freshwun]

Finally had a chance to test. Mine is reading about the same. Fan 1 at 10.20% and fan 2 at zero. Does that verify an issue with the ECU? what do these percentages mean? Both of my fans were running while I was performing the test.

[van462]

It looks as if the ECU is functioning correctly. It is commanding a normal fan setting and the fans are both on so I would think that the fan assembly is bad. The last things I would check would be that the ECU is receiving a coolant temp reading to help rule out a safety override mode. It should one of the other measuring blocks under engine. I would think the fan control (I believe it is part of the fan assembly) is faulty. I would think it could still be a possibility of wiring (In case the fan module doesn't get an ECU command it may turn to full on).
http://wiki.ross-tech.com/wiki/index...4/P0480/001152

It mentions an output test, I haven't looked in VCDS for the test to see whats there.

[freshwun]

All coolant temps respond with values. Looks like it may be the fan control module or the wiring. Thanks for the assistance.

[Zach L]

If you have the A/C on, the fan should run all the time. Are you running the A/C?

[freshwun]

No the A/C is not on and both fans run while the engine is running all the time. My understanding is that one fan is to keep the engine cool and the other fan is for the A/C. The fan also kicks on for a few seconds while the car is off and I open the door. For example, if I open my car door to get something after the engine has been off for an hour, the engine fans will turn on for 3-7 seconds dependent on how hot the engine is. Is there a connection between opening the door and the fan control module? I'm wondering if there is some type of short in the wiring to the fan control module.

[Zach L]

I would use vag-com to look at real time coolant temperatures. I had a fan issue in my mk5 GTI where they'd stay on all the time. Ended up being a faulty thermostat. The ECU was seeing unexpected coolant temps and apparently was running the fan constantly as a precautionary safety measure. There is not a specific fault code for a bad thermostat. There's just codes that point to the thermostat being a possibility in some cases. That said, I feel like your fan control module is just as likely the culprit. Thermostat changes are a complete PITA so I'd try to confirm irregular coolant temps before changing. Otherwise I'd prob try changing the FCM first. Good luck!

[freshwun]

The temp was reading 96 Celsius. I read this is the normal operating temperature.

[treginginco]

Isn't there a sensor on the radiator that reads the coolant temp and it triggers the fans when a certain temp is reached. Check there first

[treginginco]

A quick Google search found the coolant fan switch is likely your culprits ----- and it looks fairly easy to replace

[freshwun]

Is this the same thing as the fan control module? Seems like two different things. Why do you think it's the fan switch and not the fan control module?

[freshwun]

Is this the same thing as the fan control module? Seems like two different things. Why do you think it's the fan switch and not the fan control module?

I believe older vehicles use the fan switch and newer vehicles use the fan control module. So we are essentially talking about the same thing. Please correct me if I'm wrong.

[treginginco]

https://www.carpartsdiscount.com/cat...ml?3593=540955

[freshwun]

Would VCDS tell me if the cooling fan switch is bad?

[freshwun]

Would VCDS tell me if the cooling fan switch is bad?

Does the coolant fan switch only turn on the engine fan and the 2nd fan gets turned on by the A/C? If so, I would think my issue is still the fan control module since both fans always run at the same time.

[freshwun]

I replaced the fan control module and the problem still exists. Could it be the ECU? Fan switch? I'm thinking it's the ECU because both engine fans also turn on for a few seconds when I open my car doors while the engine is off.

Can someone explain in the VCDS what the measuring values mean for the coolant fan? Should coolant fan 1 be 10.20% and coolant fan 2 be 0%? Both fans are continuously running while performing the test. Does zero percent mean the fan should not be running?


[IMG][/IMG]

[freshwun]

It turned out to be an ECU issue.

[AutoRacer100]

It turned out to be an ECU issue.

How are you going to fix this ECU issue? Do you need a new ECU or just the programming is messed up?

[freshwun]

I purchased a used ECU with programming. Everything works except I'm getting a message where the trip meter is saying, "SAFE". I also see a fault in VCDS saying the immobilizer has not adapted. I'm trying to work with the vendor on a resolution. I'm also going to send my original ECU to APR to see if they can fix it in case we can't get the purchased ECU to work correctly.

[freshwun]

Turned out to be the ECU. Sent it to APR and they fixed it.

[DoItAllGarage]

Turned out to be the ECU. Sent it to APR and they fixed it.

I'm having the exact same issues. Fans full speed with cold starts, a/c off, then with key ignition off , open door fans kick on. Did some logging, coolant & oil temps are good and get the same Fan 1&2 results as you. I wonder if APR can see/find the ECU coding issue/s or just resets it. I'll make a call to APR in the next few days.