VW Polo 9N Intermittant EHPS failure

   #1  

dbac

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Hi Guys, I have an intermittant Electro-hydraulic power steering failure on a 2005 9N VW Polo. The "steering assist" warning light comes on and the steering goes heavy due to no power assistance. I have checked all electrical connections to the electric hydraulic pump and steering angle sensor on the rack. The confusion is the fault codes the car logs. The central electrics and the CAN gateway both log a failed communication with the G85 steering angle sensor on the top of the steering column. However this model does not have this sensor. G85 (according to SSP-259 doc) is only fitted on cars that have ESP as well, otherwise they use G220 sensor on the rack . Not BOTH!. Mine has G220 as I have already removed it to inspect it. I cannot clear these DTCs for the G85. The other issue is , when I observe the measuring blocks on the Steering Assist controller, the third block on group 4 says "Steering Assist sensor ref voltage --Too Low".. (scan log at end of this post) This doesn't change yet the power assistance is working most of the time and I can see the pump rpm, amperage and sensor angular velocity , change as I move the steering ,lock to lock.
Any ideas/thories welcome . kind regards Dave

Code:
Tuesday,12,August,2014,09:53:46:18348
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 12.12.2.0
Data version: 20140212


VIN: AAVZZZ9NZ5U0XXXXX   License Plate: CFM62675
Mileage: 146420km-90981mi   Repair Order: 



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


Chassis Type: 9N (9N - VW Polo (2002 > 2010))
Scan: 01 02 03 08 09 15 17 19 25 37 44 45 46 56 76
 
VIN: AAVZZZ9NZ5U0XXXXX   Mileage: 146420km/90981miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: None
   Part No: 030 906 032 EL
   Component: ME7.5.10           *2902  
   Coding: 00071
   Shop #: WSC 31414  
   VCID: 58B493D6B854C7DE837-5102
   AAVZZZ9NZ5U0XXXXX     VWZ7Z0E1311179

1 Fault Found:
16500 - Engine Coolant Temp. Sensor (G62) 
            P0116 - 35-10 - Implausible Signal - Intermittent
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 6R0-907-37x-ABS80.lbl
   Part No SW: 6Q0 907 379 AA    HW: 6Q0 907 379 AA
   Component: ABS 8.0 front   H03 0001  
   Revision: 00000000    Serial number: 00000000000000
   Coding: 0000005
   Shop #: WSC 31414 000 00000
   VCID: 7CFCEF463CACCBFEC7F-50C8

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 6Q0-820-045.lbl
   Part No: 6Q0 820 045 
   Component: Klimaanlage        X0840  
   VCID: EAD0591E9638C54EA53-50E6

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 6Qx-937-049-C.lbl
   Part No: 6Q1 937 049 D
   Component: 0000 BN-SG.         1S34  
   Coding: 25646
   Shop #: WSC 31414  
   VCID: 3C7C2F462C2C0BFE87F-50C8

3 Faults Found:
00778 - Steering Angle Sensor (G85) 
            49-00 - No Communications
01598 - Drive Battery Voltage 
            07-10 - Signal too Low - Intermittent
01044 - Control Module Incorrectly Coded 
            35-00 - -

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
   Part No: 6Q0 909 601 F
   Component: 05 AIRBAG VW5       0010  
   Coding: 12341
   Shop #: WSC 31414  
   VCID: 36683D6E1200D1AE71B-50C8

1 Fault Found:
00532 - Supply Voltage B+ 
            07-10 - Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 6Q0-920-xxx-17.lbl
   Part No: 6Q0 920 800 B
   Component: KOMBI+WEGFAHRSP VDO V19  
   Coding: 00141
   Shop #: WSC 00000  
   VCID: 2C5C1F06DC4C9B7E17F-50E6
   AAVZZZ9NZ5U0XXXXX     VWZ7Z0E1311179

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 6N0-909-901-19.lbl
   Part No: 6N0 909 901 
   Component: 001K GATEWAY CAN    1S34  
   Coding: 00014
   Shop #: WSC 31414  
   VCID: F0E44B76B0E43F9EEB7-50E6

2 Faults Found:
00778 - Steering Angle Sensor (G85) 
            49-00 - No Communications
01044 - Control Module Incorrectly Coded 
            35-00 - -

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 6Q0-423-156.clb
   Part No: 6Q0 423 156 AB
   Component: LenkhilfeTRW        V270  
   Coding: 10140
   Shop #: WSC 31414  
   VCID: 6FE6C80A2DDAA06672D-50E6

1 Fault Found:
01288 - Terminal 30; Steering Assist 
            06-10 - Signal too High - Intermittent

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 6Q0-959-433.lbl
   Part No: 6Q0 959 433 H
   Component: 1N Komfortgerát     0002  
   Coding: 00019
   Shop #: WSC 31414  
   VCID: 40845BB640C46F1EDB7-4A9C

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: None
   Part No: 6Q0 035 186 A
   Component:  Radio FF6         0001  
   Coding: 00403
   Shop #: WSC 31414  
   VCID: 2F66080AED5AE06632D-515A

No fault code found.

End   ---------------------------------------------------------------------

Code:
Tuesday,12,August,2014,13:24:33:18348
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 12.12.2.0
Data version: 20140212


VIN: AAVZZZ9NZ5U0XXXXX  License Plate: 
Mileage: 146420km-90981mi   Repair Order: 


Chassis Type: 9N (9N - VW Polo (2002 > 2010))
Scan: 01 02 03 08 09 15 17 19 25 37 44 45 46 56 76
 
VIN: AAVZZZ9NZ5U0XXXXX   Mileage: 146420km/90981miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: None
   Part No: 030 906 032 EL
   Component: ME7.5.10           *2902  
   Coding: 00071
   Shop #: WSC 31414  
   VCID: 58B493D6B854C7DE837-50E6
   AAVZZZ9NZ5U0XXXXX    VWZ7Z0E1311179

No fault code found.
Readiness: 0110 0100

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 6R0-907-37x-ABS80.lbl
   Part No SW: 6Q0 907 379 AA    HW: 6Q0 907 379 AA
   Component: ABS 8.0 front   H03 0001  
   Revision: 00000000    Serial number: 00000000000000
   Coding: 0000005
   Shop #: WSC 31414 000 00000
   VCID: 7CFCEF463CACCBFEC7F-50C8

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 6Q0-820-045.lbl
   Part No: 6Q0 820 045 
   Component: Klimaanlage        X0840  
   VCID: EAD0591E9638C54EA53-50E6

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 6Qx-937-049-C.lbl
   Part No: 6Q1 937 049 D
   Component: 0000 BN-SG.         1S34  
   Coding: 25646
   Shop #: WSC 31414  
   VCID: 3C7C2F462C2C0BFE87F-50E6

1 Fault Found:
00778 - Steering Angle Sensor (G85) 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
   Part No: 6Q0 909 601 F
   Component: 05 AIRBAG VW5       0010  
   Coding: 12341
   Shop #: WSC 31414  
   VCID: 36683D6E1200D1AE71B-50C8

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 6Q0-920-xxx-17.lbl
   Part No: 6Q0 920 800 B
   Component: KOMBI+WEGFAHRSP VDO V19  
   Coding: 00141
   Shop #: WSC 00000  
   VCID: 2C5C1F06DC4C9B7E17F-50C8
   AAVZZZ9NZ5U0XXXXX     VWZ7Z0E1311179

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 6N0-909-901-19.lbl
   Part No: 6N0 909 901 
   Component: 001K GATEWAY CAN    1S34  
   Coding: 00014
   Shop #: WSC 31414  
   VCID: F0E44B76B0E43F9EEB7-50C8

1 Fault Found:
00778 - Steering Angle Sensor (G85) 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 6Q0-423-156.clb
   Part No: 6Q0 423 156 AB
   Component: LenkhilfeTRW        V270  
   Coding: 10140
   Shop #: WSC 31414  
   VCID: 6FE6C80A2DDAA06672D-50C8

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 6Q0-959-433.lbl
   Part No: 6Q0 959 433 H
   Component: 1N Komfortgerát     0002  
   Coding: 00019
   Shop #: WSC 31414  
   VCID: 40845BB640C46F1EDB7-4A9C

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: None
   Part No: 6Q0 035 186 A
   Component:  Radio FF6         0001  
   Coding: 00403
   Shop #: WSC 31414  
   VCID: 2F66080AED5AE06632D-515A

No fault code found.

End   ---------------------------------------------------------------------

Code:
Tuesday,12,August,2014,13:11:36:18348
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 12.12.2.0
Data version: 20140212


VIN:    License Plate: 


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


                Address 44: Steering Assist  (6Q0 423 156 AB)

13:11:20 Group 001: Electrical System
  14.01 V  Voltage (Terminal 30)
  3.0 A  Pump Motor Voltage
  22.0°C  Control Module Temperature
  ON  Pump Motor Status

13:11:20 Group 002: Steering
  0.0°/s  Steer. Aid Sensor Angular Velocity
  1126 /min  Pump Motor Speed (specified)
  1126 /min  Pump Motor Speed (actual)
  3.0 A  Pump Motor Voltage

13:11:20 Group 004
  3288 h  Power Steering Activation Time
  1372  Power Steering Activation Counter
  Too Low  Steer. Aid Sensor Reference Voltage
  13.85 V  Voltage (Terminal 15)
 
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   #2  

Jack@European_Parts

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This appears to be a clear over charge condition and all connections positive and negative must be checked in addition to regulation of the alternator.

Devices by design will auto-shut down if exceeding specified voltage under and over...........
 
   #3  

dbac

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Hi Jack, many thanks for your response. I checked the battery,fuse and ground connections as well as Alternator after seeing the Term 30 high and all looked good. Charge voltage was 14.1v. Unfortunately (as normal) the intermittant fault is not there at the moment so I am waiting for the next instance. The codes are stll confusing tho for G85.
Kind regards Dave
 
   #4  

Jack@European_Parts

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Maybe change the voltage regulator in the alternator or entire alternator before something gets hot and damages other devices.

I would run additional ground straps.

Don't ignore this issue.
Absolutely check the battery has the ability to maintain voltage over 12.5 V with VCDS logged in engine controller ( engine not running for over 10 minutes ignition on and NO! other consumers switched ON )

If it drops below 12.5V in less then 10 minutes,the battery is toasters.
 
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   #5  

dafrazi

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You do have an incorrect coding fault? Do you know what was coded incorrectly? Maybe coding for the G85 sensor was put in where it doesn't belong.
 
   #6  

golfi_vend

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The only connection with can coding and steering is +8, as this is short coding can gateway, but from description, it should still have +8.
Code:
+00001 = Automatic Transmission (through MY 2001 and all PQ24 | Polo/Fabia/Ibiza/Cordoba)
+00002 = Brake Electronics
+00004 = Airbags (not for VW Transporter/Multivan 70/7D)
+00008 = Steering Aid (only PQ24 | Polo/Fabia/Ibiza/Cordoba)
+00016 = All-Wheel-Drive (only Transporter/Multivan 7H/7J)
You have active

+2
+4
+8
 
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