Andy-harris
Member
Hi all,
firstly, apologies for the long post, maybe it will be useful in the future though...
I have a 2004 A2 1.4 Sport, Petrol BBY engined . It has been very well behaved for >5 years and has ~65k on the clock. Regularly serviced at an Audi specialist. I love it.
Driving on a dual carriage way a few days ago, the low fuel warning light came on (justifiably) and then within a minute or so all sorts of lights came on (fuel, ABS, engine warning etc etc) and the engine cut out. Luckily I was able to coast on to a slip road...
The recovery guy thought it might be related to the fuel pump system as no pressure coming from the little valve at the end of the fuel rail. I think I've discounted this as if pressure is released and the ignition turned back on, the pump will run for a second or two and re-pressurise the system. I also directly successfully tested the fuel pump by disconnecting the battery and applying 12v at fuse #18 ( I *think* it was 18).
I've done the following as listed below and I'm fairly convinced at the moment that the ECU (ECM) has popped a clog. It would be fantastic to hear any thoughts, things that you think I should check or suggestions as to next steps. I am struggling to believe that (for example) a dodgy crank or cam sensor will knock out the whole ECU.
Unless I've missed something obvious, can anyone recommend an ecu supplier/repairer? There are ecus with this model and version number available on the bay for ~£200, but I think I'd rather buy one that I can be confident is working.
As an aside, there are also cheaper ones that look more recent. What would happen if fitting a newer ecu to this car? Maybe no-one has been mad enough to try it ;-)
I haven't checked any earths (yet?) - the body work is really sound and there's no damp in the passenger footwell. The battery is very healthy.
I have got a copy of VCDS-Lite, registered it, with a cable from Gendan.
When turning the ignition on:
ESP light stays on
ABS light stays on
The engine turns over willingly but will not fire. No revs shown on the speedo when turning over.
fuel gauge reads ok
During scanning, I was never able to connect to the ECU (ECM), address 01.
Tried setting Baud rate to 9600 as per https://www.a2oc.net/community/inde...o-communicate-with-engine-control-unit.28711/
Disconnected battery overnight as per
Disconnected ECU, reconnected
After all these actions, I got the same result:
[VCDS could not communicate with address 01]
The ECU is marked as Magneti Marelli 036 906 034 CA, 4MV 004 5949
Other scan results:
VCDS-Lite Version: Release 1.2 Saturday, 30 January 2021, 12:22:55:57640
Chassis Type: 8Z - Audi A2 Scan: 01,02,03,08,15,16,17,18,37,45,46,56,57,75,76,77
-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: None
Controller: 8Z0 907 379 D Component: ESP FRONT MK60 0101 Coding: 0007175 Shop #: WSC 00000 VCID: 49E53F0F60A1
2 Faults Found:
01314 - Engine Control Module (This went after clear codes)
013 - Check DTC Memory - Intermittent
01314 - Engine Control Module
004 - No Signal/Communication
-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: None Controller: 8Z0 820 043 D Component: A2-KLIMAVOLLAUTOMAT 0514 VCID: 370149F70655
No Faults Found or DTCs not supported by controller or a communication error ocurred
--Rescanned, not able to get faults
"if you have too many communication errors while try to read the aircon it's because of wrong setting in the usb port . the latancy timer is set to 16 you have to change it to 1 and then it works fine."
--I tried this later on
-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8Z0-959-655.LBL Controller: 8Z0 959 655 G Component: Airbag Front+Seite 0005 Coding: 00102 Shop #: WSC 02152 VCID: 50D3126B83FB
No fault code found.
-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8Z0-920-xxx-17.LBL Controller: 8Z0 920 980 R Component: KOMBI+WEGFAHRS. VDO D04 Coding: 04442 Shop #: WSC 00681 VCID: 50D3126B83FB WAUZZZ8Z45N003172 AUZ7Z0D2649277
3 Faults Found:
01177 - Engine Control Unit
49-00 - No Communications
01314 - Engine Control Module
49-00 - No Communications
01760 - Power Steering Control Module (J500) No comm. with Engine Control Module (ECM)
49-00 - No Communications
-------------------------------------------------------------------------------
Address 45: Inter. Monitor Labels: 8E0-951-177.LBL Controller: 8Z0 951 177 Component: Innenraumueberw. D04 Coding: 00001 Shop #: WSC 00000 VCID: 55DDE37FBC19
No fault code found.
-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: None Controller: 8Z0 959 433 AF Component: Komfortgerát TBD 1210 Coding: 06859 Shop #: WSC 02138 VCID: 8A674003A527
No fault code found.
-------------------------------------------------------------------------------
Address 56: Radio Labels: 8E0-035-1xx-56.LBL Controller: 8Z0 035 152 D Component: chorus II GRO 0004 Coding: 02000 Shop #: WSC 02138 VCID: 361F44F3015F
No fault code found.
End --------------------------------------------------------------------------------------------------
I also did a control module finder scan (00 - 7F) and found the following addtional items:
Address 25: Immobilizer Protocol: KW1281 Controller: Bit teA dre ss Component: e 17 eingeben
Address 44: Steering Assist Protocol: KW1281 Controller: Bit teA dre ss Component: e 17 eingeben
Scanning these addresses gave:
25 - no no faults found or comms error
44 - no faults found or comms error.
"if you have too many communication errors while try to read the aircon it's because of wrong setting in the usb port . the latancy timer is set to 16 you have to change it to 1 and then it works fine."
changed latency in USB to 1
(In windows this is in the advanced settings of the usb device in device manager)
Testing now shows good latency
Address 08: Auto HVAC Labels: None Controller: 8Z0 820 043 D Component: A2-KLIMAVOLLAUTOMAT 0514 VCID: 370149F70655
2 Faults Found:
01271 - Positioning Motor for Temperature Flap (V68) (this went after clear codes)
41-10 - Blocked or No Voltage - Intermittent
01206 - Signal for Duration of Ignition Off Time (this stayed)
27-00 - Implausible Signal
01206 will not clear
firstly, apologies for the long post, maybe it will be useful in the future though...
I have a 2004 A2 1.4 Sport, Petrol BBY engined . It has been very well behaved for >5 years and has ~65k on the clock. Regularly serviced at an Audi specialist. I love it.
Driving on a dual carriage way a few days ago, the low fuel warning light came on (justifiably) and then within a minute or so all sorts of lights came on (fuel, ABS, engine warning etc etc) and the engine cut out. Luckily I was able to coast on to a slip road...
The recovery guy thought it might be related to the fuel pump system as no pressure coming from the little valve at the end of the fuel rail. I think I've discounted this as if pressure is released and the ignition turned back on, the pump will run for a second or two and re-pressurise the system. I also directly successfully tested the fuel pump by disconnecting the battery and applying 12v at fuse #18 ( I *think* it was 18).
I've done the following as listed below and I'm fairly convinced at the moment that the ECU (ECM) has popped a clog. It would be fantastic to hear any thoughts, things that you think I should check or suggestions as to next steps. I am struggling to believe that (for example) a dodgy crank or cam sensor will knock out the whole ECU.
Unless I've missed something obvious, can anyone recommend an ecu supplier/repairer? There are ecus with this model and version number available on the bay for ~£200, but I think I'd rather buy one that I can be confident is working.
As an aside, there are also cheaper ones that look more recent. What would happen if fitting a newer ecu to this car? Maybe no-one has been mad enough to try it ;-)
I haven't checked any earths (yet?) - the body work is really sound and there's no damp in the passenger footwell. The battery is very healthy.
I have got a copy of VCDS-Lite, registered it, with a cable from Gendan.
When turning the ignition on:
ESP light stays on
ABS light stays on
The engine turns over willingly but will not fire. No revs shown on the speedo when turning over.
fuel gauge reads ok
During scanning, I was never able to connect to the ECU (ECM), address 01.
Tried setting Baud rate to 9600 as per https://www.a2oc.net/community/inde...o-communicate-with-engine-control-unit.28711/
Disconnected battery overnight as per
Disconnected ECU, reconnected
After all these actions, I got the same result:
[VCDS could not communicate with address 01]
The ECU is marked as Magneti Marelli 036 906 034 CA, 4MV 004 5949
Other scan results:
VCDS-Lite Version: Release 1.2 Saturday, 30 January 2021, 12:22:55:57640
Chassis Type: 8Z - Audi A2 Scan: 01,02,03,08,15,16,17,18,37,45,46,56,57,75,76,77
-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: None
Controller: 8Z0 907 379 D Component: ESP FRONT MK60 0101 Coding: 0007175 Shop #: WSC 00000 VCID: 49E53F0F60A1
2 Faults Found:
01314 - Engine Control Module (This went after clear codes)
013 - Check DTC Memory - Intermittent
01314 - Engine Control Module
004 - No Signal/Communication
-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: None Controller: 8Z0 820 043 D Component: A2-KLIMAVOLLAUTOMAT 0514 VCID: 370149F70655
No Faults Found or DTCs not supported by controller or a communication error ocurred
--Rescanned, not able to get faults
VAG-COM Too Many Communication Errors
I always thought this is a problem with my cheapo ebay VAG-COM 409 compatible cable. But today I am still investigating my climate control issue (a/c not turning on) it then came to my thoughts. My VAG-COM can talk to engine, abs, centrl conv ...etc all the modules except the HVAC! VAG-COM would...
www.a2oc.net
--I tried this later on
-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8Z0-959-655.LBL Controller: 8Z0 959 655 G Component: Airbag Front+Seite 0005 Coding: 00102 Shop #: WSC 02152 VCID: 50D3126B83FB
No fault code found.
-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8Z0-920-xxx-17.LBL Controller: 8Z0 920 980 R Component: KOMBI+WEGFAHRS. VDO D04 Coding: 04442 Shop #: WSC 00681 VCID: 50D3126B83FB WAUZZZ8Z45N003172 AUZ7Z0D2649277
3 Faults Found:
01177 - Engine Control Unit
49-00 - No Communications
01314 - Engine Control Module
49-00 - No Communications
01760 - Power Steering Control Module (J500) No comm. with Engine Control Module (ECM)
49-00 - No Communications
-------------------------------------------------------------------------------
Address 45: Inter. Monitor Labels: 8E0-951-177.LBL Controller: 8Z0 951 177 Component: Innenraumueberw. D04 Coding: 00001 Shop #: WSC 00000 VCID: 55DDE37FBC19
No fault code found.
-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: None Controller: 8Z0 959 433 AF Component: Komfortgerát TBD 1210 Coding: 06859 Shop #: WSC 02138 VCID: 8A674003A527
No fault code found.
-------------------------------------------------------------------------------
Address 56: Radio Labels: 8E0-035-1xx-56.LBL Controller: 8Z0 035 152 D Component: chorus II GRO 0004 Coding: 02000 Shop #: WSC 02138 VCID: 361F44F3015F
No fault code found.
End --------------------------------------------------------------------------------------------------
I also did a control module finder scan (00 - 7F) and found the following addtional items:
Address 25: Immobilizer Protocol: KW1281 Controller: Bit teA dre ss Component: e 17 eingeben
Address 44: Steering Assist Protocol: KW1281 Controller: Bit teA dre ss Component: e 17 eingeben
Scanning these addresses gave:
25 - no no faults found or comms error
44 - no faults found or comms error.
"if you have too many communication errors while try to read the aircon it's because of wrong setting in the usb port . the latancy timer is set to 16 you have to change it to 1 and then it works fine."
changed latency in USB to 1
(In windows this is in the advanced settings of the usb device in device manager)
Testing now shows good latency
Address 08: Auto HVAC Labels: None Controller: 8Z0 820 043 D Component: A2-KLIMAVOLLAUTOMAT 0514 VCID: 370149F70655
2 Faults Found:
01271 - Positioning Motor for Temperature Flap (V68) (this went after clear codes)
41-10 - Blocked or No Voltage - Intermittent
01206 - Signal for Duration of Ignition Off Time (this stayed)
27-00 - Implausible Signal
01206 will not clear