Refurb ecm installation question- 2005 Audi A6 quattro, 3.2L

   #1  

The Doge

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I was getting the P2404 - EVAP leak detection pump sense circuit error and after troubleshooting for a few weeks determined that the ecm module was bad. I sent it in for repair and was told that the chip was bad and could not be repaired. I purchased a refurbished unit from the company that they would clone from my original ecm. Other than the P2404 error the car started every time and ran fine. I just needed to get rid or the error in order to pass inspection. When I installed the refurb unit the car would turn over but never attempt to start. The car has just been sitting in the driveway while waiting for the ecm to arrive. I checked fuses, circuit breakers and relays with everything appearing to be fine. I assume that I have received a bad refurbished ecm but wanted to solicit opinions before starting the process of dealing with the company on this to make sure there is not something that I needed to do to make the ecm work. They said it should be plug and play. The company has not been that great to deal with so far with it taking 3 weeks from the time I sent my unit in to receiving the refurbished one back. I have attached a scan from after the installation of the ecm as well as a screenshot from group 23 of the Acc/Start Auth that shows that the Engine Control Unit is not authorized. Not sure if this means anything. As you can see there are a bunch of modules that will not communicate including the ecm.
Thanks

Rich (BB code):
Saturday,24,October,2020,12:29:03:54035
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 20.4.2.0 (x64)  HEX-V2 CB: 0.4513.4
Data version: 20200730 DS317.0
www.Ross-Tech.com


VIN:    License Plate: 10-24-20 2
Mileage: 190240km-118209mi   Repair Order:



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


Chassis Type: 4F0
Scan: 01 02 03 05 07 08 09 0E 0F 15 16 17 19 36 37 42 46 47 4F 52
          53 56 61 62 67 72 76 77

   Mileage: 190240km-118209miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: Cannot be reached 1100
02-Auto Trans -- Status: Malfunction 1010
03-ABS Brakes -- Status: Malfunction 0010
05-Acc/Start Auth. -- Status: Malfunction 0010
07-Control Head -- Status: Cannot be reached 1100
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: OK 0000
0E-Media Player 1 -- Status: Cannot be reached 1100
0F-Digital Radio -- Status: Cannot be reached 1100
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: Malfunction 0010
19-CAN Gateway -- Status: Malfunction 0010
25-Immobilizer -- Status: Malfunction 0010
36-Seat Mem. Drvr -- Status: Malfunction 0010
37-Navigation -- Status: Cannot be reached 1100
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: Cannot be reached 1100
4F-Centr. Electr. II -- Status: Malfunction 0010
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: Malfunction 0010
56-Radio -- Status: Cannot be reached 1100
61-Battery Regul. -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
67-Voice Control -- Status: Cannot be reached 1100
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: OK 0000
77-Telephone -- Status: Cannot be reached 1100
-------------------------------------------------------------------------------
Address 01: Engine
Cannot be reached

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09L-927-760.lbl
   Part No SW: 4F1 910 156 H    HW: 09L 927 156
   Component: AG6 09L 3.2 FSI USA 0020 
   Revision: --H01---    Serial number:        0077738
   Coding: 0001002
   Shop #: WSC 02327 785 00200
   VCID: 290F000715F4137325D-807C

2 Faults Found:
18289 - Powertrain Data Bus: Missing Message
            P1881 - 000 - Acceleration Request
             Freeze Frame:
                    Fault Status: 01110000
                    Fault Priority: 0
                    Fault Frequency: 1
                    Reset counter: 40
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.08.03
                    Time: 03:16:32

             Freeze Frame:
                    RPM: 0 /min
                    RPM: 0 /min
                    RPM: 0 /min
                    (no units): 30.0
                    (no units): 25.0
                    Temperature: 14.0°C
                    T.B. Angle: 60.0°

18258 - Powertrain Data Bus
            P1850 - 000 - Missing Message from ECU
             Freeze Frame:
                    Fault Status: 01110000
                    Fault Priority: 0
                    Fault Frequency: 1
                    Reset counter: 40
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.08.03
                    Time: 03:16:32


-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 4F0-910-517.clb
   Part No SW: 4F0 910 517 E    HW: 4F0 614 517 A
   Component: ESP8 quattro    H03 0010 
   Revision: 00000000    Serial number: 00000000000000
   Coding: 0020895
   Shop #: WSC 02327 785 00200
   VCID: 26150B3B04EA3C0B08F-8072

4 Faults Found:
01314 - Engine Control Module
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.08.03
                    Time: 03:02:15

             Freeze Frame:
                    Hex Value: 0x0200
                    Hex Value: 0x0182
                    Hex Value: 0x0000
                    Hex Value: 0x009A
                    Hex Value: 0x00FF

02083 - Message for Delay Request
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.08.03
                    Time: 03:02:15

             Freeze Frame:
                    Hex Value: 0x0200
                    Hex Value: 0x0182
                    Hex Value: 0x0000
                    Hex Value: 0x009A
                    Hex Value: 0x00FF

01486 - System Function Test Activated
            000 - -
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.08.03
                    Time: 03:07:58

             Freeze Frame:
                    Hex Value: 0x0200
                    Hex Value: 0x0182
                    Hex Value: 0x0000
                    Hex Value: 0x0099
                    Hex Value: 0x00FF

01826 - Sensor for Steering Angle (G85); Supply Voltage Terminal 30
            000 - -
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.08.03
                    Time: 03:07:58

             Freeze Frame:
                    Hex Value: 0x0200
                    Hex Value: 0x0182
                    Hex Value: 0x0000
                    Hex Value: 0x0099
                    Hex Value: 0x00FF


-------------------------------------------------------------------------------
Address 05: Acc/Start Auth.        Labels:. 4F0-910-852.clb
   Part No SW: 4F0 910 852     HW: 4F0 905 852 B
   Component: FBSAUDIC6 ELV   H30 0150 
   Revision: 27070401    Serial number: 10600300105369
   Coding: 0000015
   Shop #: WSC 25105 444 122159
   VCID: 6393522F375889232F1-8036

   Subsystem 1 - Part No: 4F0 910 131 L
   Component: FBSAUDIC6 EZS   H43 0070

   Subsystem 2 - Part No: 4F0 910 335
   Component: FBSAUDIC6 KSG   H25 0070

   Subsystem 3 - Part No: 4F0 910 220 G
   Component: FBSAUDIC6 IDG   H44 0060

1 Fault Found:
00230 - Transmission Park Selector Switch (F305)
            010 - Open or Short to Plus
             Freeze Frame:
                    Fault Status: 01101010
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.07.28
                    Time: 12:03:00


-------------------------------------------------------------------------------
Address 07: Control Head
Cannot be reached

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 4F0-910-043.clb
   Part No SW: 4F0 910 043     HW: 4F1 820 043 J
   Component: KLIMABETAETIGUNGH11 0110 
   Revision: 00000024    Serial number: 00000000095464
   Coding: 0524326
   Shop #: WSC 02327 785 00200
   VCID: 5BE36ACF0F28B1E3671-800E

2 Faults Found:
01314 - Engine Control Module
            008 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 04:37:12

01206 - Signal for Duration of Ignition Off Time
            008 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 04:37:12


-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 4F0-910-279.lbl
   Part No SW: 4F0 910 279     HW: 4F0 907 279
   Component: ILM Fahrer      H14 0080 
   Revision: 00000000    Serial number: 4F0907279     
   Coding: 0012123
   Shop #: WSC 02335 785 00200
   VCID: 66954B3BC46AFC0BC8F-8032

   Subsystem 1 - Part No: 4F1 910 113   Labels: 1KX-955-119.CLB
   Component: Wischer AudiC6  H05 0150 
   Coding: 00062736
   Shop #: WSC 02335 

   Subsystem 2 - Part No: 4E0 910 557   Labels: 8K0-955-559.CLB
   Component: REGENLICHTSENSORH10 0050 
   Coding: 00141886
   Shop #: WSC 02335 

No fault code found.

-------------------------------------------------------------------------------
Address 0E: Media Player 1
Cannot be reached

-------------------------------------------------------------------------------
Address 0F: Digital Radio
Cannot be reached

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4F0-910-655-8R.clb
   Part No SW: 4F0 910 655 B    HW: 4F0 959 655 A
   Component: 56 AIRBAG AUDI8RH29 0310 
   Revision: 10H29000    Serial number: 00359D08489G 
   Coding: 0013622
   Shop #: WSC 25105 444 84543
   VCID: 26150B3B04EA3C0B08F-8072

   Subsystem 1 - Part No: 4F0 910 339
   Component: BF-Gewichtsens. 002 0040

   Subsystem 2 - Serial number: 6332CSME0775324F4

   Subsystem 3 - Serial number: 6342CSME07753111U

   Subsystem 4 - Serial number: 6351HSME055B53398

   Subsystem 5 - Serial number: 6361HSME0550040C.

   Subsystem 6 - Serial number: 6371VSME0500461FE

   Subsystem 7 - Serial number: 6381VSME0503033EC

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 4F0-910-549.lbl
   Part No SW: 4F0 910 549     HW: 4F0 953 549 A
   Component: Lenksäulenmodul H07 0230 
   Revision: 00H07000    Serial number: 90022043390019
   Coding: 0002041
   Shop #: WSC 02323 785 00200
   VCID: 66954B3BC46AFC0BC8F-8032

   Subsystem 1 - Part No: XXXXXXXXXXX
   Component: Lenkradmodul    H06 0080

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 4F0-910-xxx-17.lbl
   Part No SW: 4F0 910 900 A    HW: 4F0 920 950 M
   Component: KOMBIINSTR. M73 H10 0510 
   Revision: 00000000    Serial number: 4R851Y9D4     
   Coding: 0001203
   Shop #: WSC 12345 111 45725
   VCID: 1E6523DB5CBAE4CB40F-804A

1 Fault Found:
01314 - Engine Control Module
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 2
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 04:37:08


-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels:. 4F0-910-468.clb
   Part No SW: 4F0 910 468 A    HW: 4F0 907 468 B
   Component: Gateway         H09 0030 
   Revision: 09          Serial number: 0800804B27002E
   Coding: ECFE53CC1B7904
   Shop #: WSC 02325 785 00200
   VCID: 270B063F03E02503339-8072

3 Faults Found:
01314 - Engine Control Module
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 04:37:08

00384 - Optical Databus
            011 - Open Circuit
             Freeze Frame:
                    Fault Status: 01101011
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 04:37:53

01315 - Transmission Control Module
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 13
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 05:43:50


-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr        Labels: None
   Part No SW: 4F0 910 760     HW: 4F0 959 760
   Component: Sitzmemory FS   H04 0050 
   Revision: 00000000    Serial number: 00000000896400
   Coding: 0082954
   Shop #: WSC 02327 785 00200
   VCID: 619F58272D449B333DD-8034

2 Faults Found:
01446 - Sensor for Driver Seat; Seatback Adjust (G230)
            005 - No or Incorrect Basic Setting / Adaptation
             Freeze Frame:
                    Fault Status: 01100101
                    Fault Priority: 4
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190240 km
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 04:37:06

00003 - Control Module
            005 - No or Incorrect Basic Setting / Adaptation
             Freeze Frame:
                    Fault Status: 01100101
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190240 km
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 04:37:06


-------------------------------------------------------------------------------
Address 37: Navigation
Cannot be reached

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels: 4F0-910-793-42.lbl
   Part No SW: 4F0 910 793 B    HW: 4F0 959 793 B
   Component: TSG FA          H10 0020 
   Revision: 00000000    Serial number: 9”7
   Coding: 0051947
   Shop #: WSC 02327 785 00200
   VCID: 290F000715F4137325D-807C

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 4F0-910-289.lbl
   Part No SW: 4F0 910 289 E    HW: 4F0 907 289 E
   Component: Komfortgeraet   H14 0090 
   Revision: 00900014    Serial number: 01001941150000
   Coding: 0423997
   Shop #: WSC 02335 785 00200
   VCID: 2C01F9131A06065BDEB-8078

   Subsystem 1 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HORN H02 1301

2 Faults Found:
01134 - Alarm Horn (H12)
            012 - Electrical Fault in Circuit
             Freeze Frame:
                    Fault Status: 01101100
                    Fault Priority: 3
                    Fault Frequency: 254
                    Reset counter: 229
                    Mileage: 170908 km
                    Time Indication: 0
                    Date: 2019.11.13
                    Time: 08:29:14

01314 - Engine Control Module
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 3
                    Fault Frequency: 39
                    Reset counter: 229
                    Mileage: 190243 km
                    Time Indication: 0
                    Date: 2020.09.27
                    Time: 10:13:47


-------------------------------------------------------------------------------
Address 47: Sound System
Cannot be reached

-------------------------------------------------------------------------------
Address 4F: Centr. Electr. II        Labels: 4F0-910-280.lbl
   Part No SW: 4F0 910 280     HW: 4F0 907 280 A
   Component: ILM Beifahrer   H09 0050 
   Revision:             Serial number: 00000000052829
   Coding: 0001114
   Shop #: WSC 02323 785 00200
   VCID: 5EE563DB1C3AA4CB00F-800A

1 Fault Found:
01314 - Engine Control Module
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 3
                    Fault Frequency: 12
                    Reset counter: 229
                    Mileage: 190240 km
                    Time Indication: 0
                    Date: 2023.06.06
                    Time: 00:00:00

             Freeze Frame:
                    Voltage: 12.300 V
                    Temperature: 27.0°C


-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels: 4F0-910-793-52.lbl
   Part No SW: 4F0 910 793 B    HW: 4F0 959 792 B
   Component: TSG BF          H10 0020 
   Revision: 00000000    Serial number: „6
   Coding: 0051947
   Shop #: WSC 02327 785 00200
   VCID: 290F000715F4137325D-807C

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake        Labels: 4F0-910-801.clb
   Part No SW: 4F0 910 801     HW: 4F0 907 801
   Component: EPB  C63C0030   H03 0030 
   Revision: C63C0030   
   Coding: 0005022
   Shop #: WSC 02334 785 00200
   VCID: 5DE764D7113CBFD3195-8008

3 Faults Found:
01315 - Transmission Control Module
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 4
                    Fault Frequency: 1
                    Reset counter: 13
                    Mileage: 190240 km
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 05:43:50

             Freeze Frame:
                    Voltage: 11.39 V
                    Count: 243

02443 - Control Head
            012 - Electrical Fault in Circuit - MIL ON
             Freeze Frame:
                    Fault Status: 11111100
                    Fault Priority: 2
                    Fault Frequency: 215
                    Reset counter: 229
                    Time Indication: 0

             Freeze Frame:
                    Voltage: 11.70 V
                    Count: 40

01314 - Engine Control Module
            004 - No Signal/Communication - MIL ON
             Freeze Frame:
                    Fault Status: 11100100
                    Fault Priority: 4
                    Fault Frequency: 70
                    Reset counter: 229
                    Mileage: 190240 km
                    Time Indication: 0
                    Date: 2020.09.27
                    Time: 10:13:45

             Freeze Frame:
                    Voltage: 12.21 V
                    Count: 241


-------------------------------------------------------------------------------
Address 56: Radio
Cannot be reached

-------------------------------------------------------------------------------
Address 61: Battery Regul.        Labels: 4F0-910-181.lbl
   Part No SW: 4F0 910 181 E    HW: 4F0 915 181 A
   Component: ENERGIEMANAGER  H11 0490 
   Revision: 00000000    Serial number: 00000000092195
   Shop #: WSC 00000 384 00290
   VCID: 2313122F77D8C9236F1-8076

   Subsystem 1 - Part No: 4F0 915 105 C
   Component: von VA0  2412090156       
   Coding: 344630393135313035432056413032343132303930313536
   Shop #: WSC 00000 384 00290

2 Faults Found:
01299 - Diagnostic Interface for Data Bus (J533)
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 229
                    Mileage: 190242 km
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 04:37:06

02273 - Quiescent Current Stage 2
            000 - - - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 7
                    Fault Frequency: 1
                    Reset counter: 255
                    Time Indication: 0
                    Date: 2004.07.31
                    Time: 08:54:32


-------------------------------------------------------------------------------
Address 62: Door, Rear Left        Labels: 4F0-910-795.lbl
   Part No SW: 4F0 910 795     HW: 4F0 959 795
   Component: TSG HL          H09 0010 
   Coding: 0051754
   Shop #: WSC 02327 785 00200
   VCID: 698F4007D574D373E5D-803C

No fault code found.

-------------------------------------------------------------------------------
Address 67: Voice Control
Cannot be reached

-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels: 4F0-910-795.lbl
   Part No SW: 4F0 910 795     HW: 4F0 959 794
   Component: TSG HR          H09 0010 
   Coding: 0051754
   Shop #: WSC 02327 785 00200
   VCID: 698F4007D574D373E5D-803C

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 4Fx-910-283.lbl
   Part No SW: 4F0 910 283     HW: 4F0 919 283
   Component: Parkhilfe 4-Kan H09 0030 
   Revision: --.--.--    Serial number: 11730432801212
   Coding: 0001206
   Shop #: WSC 131071 1023 2097151
   VCID: 619F58272D449B333DD-8034

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone
Cannot be reached

End----(Elapsed Time: 01:46, VBatt start/end: 12.0V/11.9V. VIgn 12.0V)-----
 
   #2  

Jack@European_Parts

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Are they the alledged Expert's?

Did you ask for your old module back, im seeing a pattern story here anyone else? :rolleyes:

Did you test the circuit with decade box or fail to operate by noid in your test path?

Just how did you condemn the old ECU?
 
   #3  

The Doge

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Unfortunately I did not think to ask for them to send my old unit back. I foolishly thought it would be putting it back in the car, hooking up 2 connectors and I would be good. If it does appear to be a bad ecm I will need to remove the ecm, and then hire a mobile mechanic to install it in order for the company to honor the warranty. When making the purchase you can easily see on their website that it comes with a lifetime warranty. When you open the package there are instructions and in large letters that state that it must be installed by a "licensed" mechanic in order to have any warranty. I went back to their website and had to dig to find this information. Definitely misleading. If I have to contact them I will ask if my old unit is available but I doubt if I will see it again. Not sure what my options will be if I can get no joy out of this company and having a module with bad programming which will prevent from having another unit cloned. Could you clarify which circuit you are referencing? I checked the voltages on the ecm connector and was receiving +12v on pins 6 & 18. To troubleshoot the P2404 code I ran through the procedures I found on this forum to test the components from the pump forward.
 
   #4  

The Doge

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I had the mobile mechanic out today to install the ecm to make it official. He used his scanner and pulled a P0600 - ECU synced to VIN number code. This particular code did not show up in the Vag Com scan. I will be sending in the form to the company to start the return process.
 
   #5  

Jetta 97

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I can say you have 100% bad ECU , It can not be reach with VCDS at all, and some other modules do not have communication with ECU.
The ECU they send you it is not Refurbish , it is most likely USED ECU they paint and Announced as Refurbish.

I wish I saw this early , I am in DFW area, and you could go with good Used ECU .
 
   #6  

Jack@European_Parts

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Marin

I bet old ECU is not even bad being a wiring harness issue is more likely.

OP did you qualify old ECU was bad with decade box by JPPSG?
 
   #7  

Jack@European_Parts

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After OP gets his old ECU back or new one etc. and you have the same fault for P2404.

When working with the LDP and any part of the fuel system, please be mindful of the safety needed!

Did you know the first step is too always authenticate the voltage is sent to the LDP and the ECU can switch the ground by noid observation?

Did you know the signal wire must also be authenticated for ability to carry load & in some rare cases be with a shield, say a twisted set added and one to ground to protect from outside radio interference & since low voltage from one end of car to other is too long for this low signal?

Did you know in many cases a weak or inconsistent vacuum is the cause for the LDP to demonstrate this DTC issue or an actual EVAP leak?

Did you know the ECU can be qualified if it sees the values needed with a decade box & on signal line and observed in blocks or by changing a DTC to vacated or in most cases an inverse DTC for most sensors?

Since most of the time this fault shows due to widespread "small" vacuum leaks, would it be suggested to make an easy test to authenticate?

The LDP does two things.

It pumps filtered air mechanically into the gas tank by using vacuum supplied to it to generate a pump action & is done by a switched solenoid to ground by ECU.
The second is the sensor or signal line displays a change in the LDP diaphragm to indicate its stroke to ECU.

The ECU stack programming uses this information to cross check if a leak is present to display a DTC, further relieves aforementioned air pumped into the gas tank by means of the N80 through the charcoal filter to blend the vapors in intake and burn them and uses the front & most of the time rear OXS sensor after the CAT to determine if the vapors are successful being remediated.

The LDP shares with the EVAP the two tests to combine the readiness bit highlighted in red .
Readiness: 0000 0100 ( 0x01-04-070 EVAP ) + ( 0x01-04-071 LDP )

With the aforementioned stated, could you not crimp and separate the vacuum line to engine area to LDP and add a direct vacuum pump to supply "consistent" vacuum to LDP pump & so that the LDP is always with vacuum to test?
If the fault went away and you were able to authenticate vapors by N80 test 0x01-04-070 and complete both ends of the shared bits of the EVAP and LDP readiness 0x01-04-071 , would this indicate there is a vacuum leak or insufficient vacuum being sent from engine to LDP to investigate?
 
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Jack@European_Parts

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NOTE: DID YOU KNOW?

In the many "use cases" where an ECU was actually sorting this alleged issue & as read online, it only happened again & even after new hardware or subsequent firmware levels, want to know why?

The most likely vacuum leak & being minor is not fixed or dismissed as a mechanical problem and the LDP circuit which gets damaged in ECU as a result of "over use" software or resulted damaged hardware cant be fixed if you do not fix the cause?

What happens in turn, the switch driver heats up within the ECU & until it creates the aforementioned code, however, not a code for shutting down the driver in many cases since it supports a breaker/logic?

Did you know sometimes it does this when the owner drives the car & negates maybe due to being poor whatever, they drive around with a low fuel tank all the time, further resulting in even more air being required pumped into the fuel tank to achieve a leak detection test or in many cases self aborts?

Did you know a combination or bifurcated load reduction relay's can be installed with fuse to stop this & so the ECU isn't triggering a coil on other side of car over an inadequately sized wire due to some bean counter, ever think about that? :p
 
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