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Thread: Relative compression test, make the car crank but not start

  1. #1
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    Relative compression test, make the car crank but not start

    I have a 2005 Touareg with R5 engine and I want to perform a relative compression test. Therefore I need to make the car crank but not start. Is it possible to do something in VCDS to prohibit the car from starting?

  2. #2
    VCDS Distributor AIB Wolfgang's Avatar
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    Hello
    This is the "new user" section.
    What's about a little hello from TregR5?
    After that, please get verified and send a complete Auto-Scan in
    https://forums.ross-tech.com/forumdi...Repair-Support

    Thank you
    -Wolfgang

    Drive more talk less

  3. #3
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    Oh hello, sorry, was maybe a little fast posting my question without any introduction. A little info about me: I have cars and motorbikes as a hobby and are interested in car/motorcycle diagnostics. I have now put my VCDS serial number, in my profile. I dont need to scan my car, but are interested if VCDS are able to prohibit my car from starting when cranking it. Do you know if it is possible and if so, what the procedure is? I am going to take a relative compression test with my oscilloscope so therefore i need to crank for some seconds. Thanks.

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    The requirement for an autoscan is so that people know what hardware and such related stuff your particular car has. One answer for one person may not be relevant to another person with a similar car.

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  6. #5
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    The requirement for an autoscan is so that people know what hardware and such related stuff your particular car has. One answer for one person may not be relevant to another person with a similar car.
    Thanks for the information. I will do the auto scan tomorrow and post the result.

  7. #6
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    Unplug crank/cam sensors or unplug the PD injector loom where it goes into the cylinder head - it will throw fault codes but you have VCDS to remove them after.

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  9. #7
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    I got a bit delayed with the job but now I have performed it.
    Unplug crank/cam sensors or unplug the PD injector loom where it goes into the cylinder head - it will throw fault codes but you have VCDS to remove them after.
    I did unplug the PD injector loom and was then able to crank for as long as needed, thank you! The concern I have is a P0304 fault code which was the initial reason I wanted to perform a relative compression test. Is this cylinder no.4 or is it cylinder no.4 in the firing sequence (which is cylinder no.5)? Does anyone have an idea what might set this fault code? The results from the relative compression test seems ok, but I have not performed it a lot of times. I notice that the engine starts vibrating, which off course seems natural since one of the cylinders does not fire properly, when the fault code is set. It seems that this happens when engine are "semi warm", not at cold state and not at fully warm state. Attached is the report from the auto-scan.


    Code:
    Sunday,12,May,2019,16:26:23:46421
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 18.9.1.0 (x64)
    Data version: 20190114 DS296.0
    www.Ross-Tech.com
    
    
    VIN: WVGZZZ7LZ5D001609   License Plate: 
    Mileage: 196740km-122248mi   Repair Order: 
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Chassis Type: 7L (7L - VW Touareg (2003 > 11/2006))
    Scan: 01 02 03 05 06 08 09 11 13 15 16 17 18 19 1C 22 29 32 34 36
              37 39 3C 46 47 55 56 57 64 65 68 69 6C 6D 6E 75 76 77
     
    VIN: WVGZZZ7LZ5D001609   Mileage: 196740km-122248miles
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: Redir Fail!
       Part No SW: 070 997 016 E    HW: 028 101 125 8
       Component: R5 2,5L EDC G001AG  9769  
       Revision: 12345678    Serial number: VWZ3Z0D1205352
       Coding: 0011175
       Shop #: WSC 31414 000 00000
       VCID: 1C37968EDC1E92AA21-515E
    
    2 Faults Found:
    16502 - Engine Coolant Temp. Sensor (G62) 
                P0118 - 000 - Signal too High - Intermittent
                 Freeze Frame:
                        RPM: 1554 /min
                        Torque: 202.5 Nm
                        Speed: 44.0 km/h
                        Load: 31.0 %
                        Voltage: 14.36 V
                        Bin. Bits: 00001000
                        Temperature: 47.7°C
                        Temperature: 36.9°C
    
    16688 - Cylinder 4 
                P0304 - 000 - Misfire Detected
                 Freeze Frame:
                        RPM: 756 /min
                        Torque: 102.5 Nm
                        Speed: 0.0 km/h
                        Load: 0.0 %
                        Voltage: 13.91 V
                        Inj. Quantity: 2.96 mg/str
                        Temperature: 51.3°C
                        (no units): 0.0
    
    Readiness: 0 0 0 X 1 
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 09D-927-750.clb
       Part No: 09D 927 750 BP
       Component: AL 750 6A           0560  
       Coding: 0004136
       Shop #: WSC 31414 000 00000
       VCID: 7DF1BB0A27443BA2B6-515E
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 05: Acc/Start Auth.        Labels: 3D0-909-13x-05.lbl
       Part No SW: 3D0 909 135 J    HW: 5WK 470 21
       Component:    Kessy            6400  
       Coding: 0000232
       Shop #: WSC 31414 000 00000
       VCID: 2C57464E8CBE622A51-515E
    
       Subsystem 1 - Part No: 4E0 905 852 D
       Component: ELV                 1834
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 7L6-907-040.clb
       Part No: 7L6 907 040 H
       Component: CLIMAtronic R/L   X 3716  
       Coding: 0000030
       Shop #: WSC 31414 000 00000
       VCID: 3561632A5FF423E23E-5140
    
    3 Faults Found:
    02193 - Supply Voltage for Regulator for Fresh Air Blower 
                010 - Open or Short to Plus
    00353 - Function Return Message from Fresh Air Blower Regulator 
                002 - Lower Limit Exceeded - Intermittent
                 Freeze Frame:
                        Voltage: 14.40 V
                        Voltage: 11.83 V
                        Voltage: 0.00 V
                        Voltage: 14.00 V
    
    01592 - Air Quality Sensor (G238) 
                014 - Defective
                 Freeze Frame:
    
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels:. 7Lx-937-049-V1.clb
       Part No: 7L6 937 049 K
       Component:                     2703  
       Coding: 0103677
       Shop #: WSC 00795 218 05193
       VCID: 44870EEE042E8A6AB9-515E
    
    1 Fault Found:
    00907 - Intervention load Management 
                000 -  - 
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 3D0-909-601.lbl
       Part No: 3D0 909 601 E
       Component: 0B Airbag 8.4E+ H10 0951  
       Coding: 0012354
       Shop #: WSC 31414 000 00000
       VCID: 2541B36AEF5453628E-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel        Labels: 7L6-953-549.lbl
       Part No: 7L6 953 549 D
       Component: Lenksäulenmodul     3301  
       Coding: 0000031
       Shop #: WSC 31414 000 00000
       VCID: 408F02FE1036964A9D-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 7L6-920-xxx-7LA.lbl
       Part No: 7L6 920 880 M
       Component: KOMBIINSTRUMENT RB8 2935  
       Coding: 0005111
       Shop #: WSC 00795 218 92423
       VCID: 418907FA1B3C9F4292-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 18: Aux. Heat        Labels: 7L6-819-008.clb
       Part No: 7L6 815 071 B
       Component: Standheizung  E1MAC 0235  
       Coding: 0000000
       Shop #: WSC 00000 000 00000
       VCID: 3169573AAB9C0FC262-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway        Labels: 6N0-909-901-19.lbl
       Part No: 6N0 909 901 
       Component: Gateway K<>CAN      0101  
       Coding: 0000006
       Shop #: WSC 31414 000 00000
       VCID: 70EF923E601646CA2D-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 22: AWD        Labels: None
       Part No: 0AD 927 755 BE
       Component: TRANSFERCASE        0122  
       Shop #: WSC 00000 000 00000
       VCID: 7F0D41022D4829B2A4-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 29: Left Light        Labels: 3D0-909-157.lbl
       Part No: 3D0 909 157 
       Component: EVG GDL+AutoLWR(l)  0001  
       Coding: 0000003
       Shop #: WSC 31414 000 00000
       VCID: 66C3F46652D2987A47-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 34: Level Control        Labels: 7Lx-907-553-34.clb
       Part No: 7L0 907 553 F
       Component: LUFTFDR.-CDC- 3C3P1 3081  
       Coding: 0015521
       Shop #: WSC 31414 000 00000
       VCID: 3663642642F228FA37-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 36: Seat Mem. Drvr        Labels: None
       Part No: 7L0 959 760 
       Component: Sitzverstellung     0702  
       Shop #: WSC 00000 000 00000
       VCID: 77FDA922057811F2EC-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 37: Navigation        Labels: 7L6-919-887-CD.lbl
       Part No: 7L6 919 887 B
       Component:      Navigation     0629  
       Coding: 0000002
       Shop #: WSC 31414 000 00000
       VCID: 458113EA0F14B362AE-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 39: Right Light        Labels: 3D0-909-158.lbl
       Part No: 3D0 909 158 
       Component: EVG GDL+AutoLWR(r)  0001  
       Coding: 0000003
       Shop #: WSC 31414 000 00000
       VCID: 67DDF96255D881727C-5140
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels: 7L0-959-933.lbl
       Part No: 7L0 959 933 G
       Component: 1N HSG              3213  
       Coding: 0000065
       Shop #: WSC 00490 218 186825
       VCID: 408F02FE1036964A9D-4AE8
    
       Subsystem 1 - Part No: 7L0 959 701 A
       Component: Tuersteuergeraet FS 0201
    
       Subsystem 2 - Part No: 7L0 959 702 A
       Component: Tuersteuergeraet BF 0201
    
       Subsystem 3 - Part No: 7L0 959 703 
       Component: Tuersteuergeraet HL 0201
    
       Subsystem 4 - Part No: 7L0 959 704 
       Component: Tuersteuergeraet HR 0201
    
       Subsystem 5 - Part No: 7L0 907 719 
       Component:    Neigungssensor   0020
    
       Subsystem 6 - Part No: 7L6 951 171 
       Component: A  Innenraumsensor  0019
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio        Labels: 7L6-035-186-CD.lbl
       Part No: 7L6 035 186 A
       Component:        Radio        0629  
       Coding: 0007447
       Shop #: WSC 31414 000 00000
       VCID: 3169573AAB9C0FC262-5140
    
    2 Faults Found:
    00878 - Connection to Speaker Front Left 
                012 - Electrical Fault in Circuit
    00881 - Connection to Speaker Rear Right 
                012 - Electrical Fault in Circuit
    
    -------------------------------------------------------------------------------
    Address 68: Wiper Electr.        Labels: 7L0-955-119-V1.clb
       Part No: 7L0 955 119 F
       Component: Front Wiper         2416  
       Coding: 0000004
       Shop #: WSC 31414 000 376832
       VCID: 377D692245F8D1F22C-515E
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 76: Park Assist        Labels: None
       Part No: 7L0 919 283 E
       Component: 0E Einparkhilfe     0907  
       Shop #: WSC 00000 000 00000
       VCID: 387F6A1E48E6DE8A25-515E
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 77: Telephone        Labels: Redir Fail!
       Part No: 7L6 035 729 E
       Component: CIB PAH  HW 202 SW  0307  
       Coding: 0000372
       Shop #: WSC 31414 000 00000
       VCID: 387F6A1E48E6DE8A25-515E
    
    No fault code found.
    
    End-------------------------(Elapsed Time: 08:22)--------------------------

  10. #8
    Verified VCDS User PetrolDave's Avatar
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    I would suggest fixing the G62 fault first and then see again whether the misfire is still present.

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  12. #9
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    I am working on the G62 now, the sensor seems to give a stable resistance and it is increasing with decreasing temperatur. Anyone know how likely it could it be that the sensor itself could be intermitently working? I am also very open for suggestions regarding the misfire since I suspect that these two faults codes are separate issues, even though I think it is a good idea to focus on the G62. Thank you.

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