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Thread: 2015 Audi A6 - Aircon Failure

  1. #1
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    2015 Audi A6 - Aircon Failure

    Hi All,

    I bought my Ross Tech HEX-V2 device a month or so ago and I am loving what I can do with it.

    I originally bought it as I had multiple lights on my dash which turned out to be a faulty wheel sensor. I've since replaced this and erased the DTC's without any further issues however I've now got an aircon fault which has started on the hottest day of the year... always the case!!!

    Could someone help me identify what the problem is? I have a fault code but don't know how to identify what it actually means - is there a list anywhere? Also any advice on how to check the pressures or any other part of the system using vcds would be very welcome

    As you can probably tell I am very new to this.

    Thanks

    Ben

    Code:
    Thursday,25,June,2020,18:38:26:25046
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 20.4.1.0 (x64)  HEX-V2 CB: 0.4508.4
    Data version: 20200331 DS317.0
    www.Ross-Tech.com
    
    
    VIN: WAUZZZ4G2GN055827   License Plate: 
    
    
    Chassis Type: 4G-AU57 (4G5)
    Scan: 01 02 03 05 08 09 15 16 17 19 20 28 3B 42 44 46 47 52 53 55
              5F 62 6D 72 AC
    
    VIN: WAUZZZ4G2GN055827   Mileage: 145808km-90600miles
    
    01-Engine -- Status: OK 0000
    02-Auto Trans -- Status: OK 0000
    03-ABS Brakes -- Status: OK 0000
    04-Steering Angle -- Status: OK 0000
    05-Acc/Start Auth. -- Status: OK 0000
    08-Auto HVAC -- Status: Malfunction 0010
    09-Cent. Elect. -- Status: OK 0000
    15-Airbags -- Status: OK 0000
    16-Steering wheel -- Status: OK 0000
    17-Instruments -- Status: Malfunction 0010
    19-CAN Gateway -- Status: OK 0000
    20-High Beam Assist. -- Status: OK 0000
    28-HVAC, Rear -- Status: OK 0000
    3B-Sensor Elect. -- Status: OK 0000
    42-Door Elect, Driver -- Status: OK 0000
    44-Steering Assist -- Status: OK 0000
    46-Central Conv. -- Status: OK 0000
    47-Sound System -- Status: OK 0000
    52-Door Elect, Pass. -- Status: OK 0000
    53-Parking Brake -- Status: OK 0000
    55-Headlight Range -- Status: OK 0000
    5F-Information Electr. -- Status: OK 0000
    62-Door, Rear Left -- Status: OK 0000
    6D-Trunk Elect. -- Status: OK 0000
    72-Door, Rear Right -- Status: OK 0000
    AC-Reductant Control -- Status: OK 0000
    -------------------------------------------------------------------------------
    Address 01: Engine (J623-CNHA)       Labels:. 04L-907-309-V1.clb
       Part No SW: 04L 906 021 FQ    HW: 04L 907 309 
       Component: R4 2,0L EDC   H23 1649  
       Revision: 85H23---    
       Coding: 12254012242401080000
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_ECM20TDI01104L906021FQ 002004
       ROD: EV_ECM20TDI01104L906021FQ_002.rod
       VCID: 79AFE8C0895F4FA3145-802C
    
    No fault code found.
    Readiness: 0 0 0 0 1 
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans (J217)       Labels:| 0CJ-927-156.clb
       Part No SW: 4G1 927 153 B    HW: 0CK 927 156 S
       Component: 0CK 20TDI RdW H03 0002  
       Revision: --H03---    Serial number: 0000000057
       Coding: 100001
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_TCMDL382021 002020
       ROD: EV_TCMDL382021_VW51.rod
       VCID: 290FF880397F3F23245-807C
    
       Manual Transmission Fluid Pump: 
       Subsystem 1 - Part No SW: 0CK 927 152 AA    HW: 0CK 321 281 K
       Component: V553 MTFP  HB1 0572 
       Serial number: 75117041150160000827
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes (J104)       Labels:. 4G0-907-379-V2.clb
       Part No SW: 4G0 907 379 S    HW: 4G0 907 379 S
       Component: ESP9 Premium  H01 0530  
       Revision: --------    Serial number: --------------
       Coding: 06A29E41604579829B00
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_ESP9BOSCHAU57X 004018
       ROD: EV_ESP9BOSCHAU57X.rod
       VCID: 41DF4020A10FD7631C5-8014
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
       Part No SW: 4H0 907 064 GN    HW: 4H0 907 064 GN
       Component: BCM2 2.0      H37 0572  
       Revision: 00002001    
       Coding: 01B9704E000000000000
       Shop #: WSC 02391 785 00200
       VCID: 7BA3F2C883E37DB3069-802E
    
       Subsystem 2 - Part No SW: 4H0 905 852 C    HW: 4H0 905 852 C
       Component: J764 ELV MLB  H40 0046 
       Serial number: 3215000117598011    
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC (J255)       Labels:| 4G0-820-043-4Z.clb
       Part No SW: 4G0 820 043 CD    HW: 4G0 820 043 CD
       Component: KLIMA 4 ZONEN H14 0112  
       Serial number: 14071500040722
       Coding: 34220978210000
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_AirCondiComfoUDS 003008
       ROD: EV_AirCondiComfoUDS_003.rod
       VCID: 6393AAA81BD3A5732E9-8036
    
    1 Fault Found:
    0557 - A/C clutch 
              B1488 15 [009] - Open or Short to Plus
              Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 52
                        Mileage: 145799 km
                        Date: 2020.06.24
                        Time: 21:01:54
    
                        Voltage terminal 30: 13.83 V
                        A/C clutch-Remaining run time for play protection: 0.0 s
                        A/C clutch-Status: On
                        A/C clutch-Supply voltage: 13.5 V
                        A/C clutch-Current power consumption: 0.000 A
    
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect. (J519)       Labels:. 4H0-907-063-V2.clb
       Part No SW: 4H0 907 063 DH    HW: 4H0 907 063 AH
       Component: BCM1 2.0      H20 0311  
       Revision: 15020001    Serial number: 00001117237701
       Coding: 0105001440349FE041014083000018000F9DC7082F08020100000894E100140200400024030000
       Shop #: WSC 02391 785 00200
       VCID: 71BFD0E0D1AF07E3AC5-8024
    
       Subsystem 1 - Part No SW: 4G2 955 119     HW: 4G8 955 119 A  Labels: 1KX-955-119.CLB
       Component: WWS57X 150626  H37 0080 
       Serial number:         150701035637
       Coding: 0045F7
    
       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: 24092399            
       Coding: 02006D
    
       Subsystem 3 - Part No SW: 4G0 941 531 BE    HW: 4G0 941 531 BE
       Component: E1 - LDS  H07 0044 
       Serial number: 12 07 2015  00000289
    
       Subsystem 4 - Part No SW: 4H0 907 658     HW: 4H0 907 658 
       Component: AQ_Hum_Sensor  H03 0003 
       Serial number: E3C8C5B7000000000001
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags (J234)       Labels:* 4H0-959-655.clb
       Part No SW: 4H0 959 655 H    HW: 4H0 959 655 H
       Component: Airbag10.43   H82 0086  
       Revision: --------    Serial number: 003P1005PTCE
       Coding: 30333130313630323639554A305234473053
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_AirbaAU10BPAAU64X 001014
       ROD: EV_AirbaAU10BPAAU64X_VW51.rod
       VCID: 3B2332C8C3E3BDB3469-806E
    
       Crash sensor for side airbag: driver side: 
       Serial number: 3575HRB405P3H46A3P7C
    
       Crash sensor for side airbag: front passenger side: 
       Serial number: 3585HRB405H3H46CC1QB
    
       Crash sensor for side airbag: rear: driver side: 
       Serial number: 3515JRB401I53400M9AI
    
       Crash sensor for side airbag: rear: passenger side: 
       Serial number: 3525JRB401I534009GKN
    
       Crash sensor for front airbag: driver side: 
       Serial number: 3554VRB40653GAJID8N$
    
       Crash sensor for front airbag: front passenger side: 
       Serial number: 3564VRB40533GSECD0IV
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel (J527)       Labels:. 4H0-953-568.clb
       Part No SW: 4H0 953 568 K    HW: 4H0 953 568 K
       Component: Lenks.Modul   H06 0005  
       Revision: C0068538    Serial number: 90862OG40000A 
       Coding: 000035
       Shop #: WSC 02391 785 00200
       VCID: 3B2332C8C363BDB3469-806E
    
       Subsystem 1 - Part No SW: 4G0 951 528 A    HW: 4G0 951 528 A
       Component: E221 - MFL  H08 0010 
       Serial number: 19 06 2015  D0055417
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments (J285)       Labels:| 4H0-920-xxx-17.clb-SRI1
       Part No SW: 4G8 920 951 E    HW: 4G8 920 951 E
       Component: MDieGb        H43 0604  
       Revision: 29450306    Serial number: 658130715592033
       Coding: 33A712000B412600010000
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_RBC7KMID 004050
       ROD: EV_RBC7KMID.rod
       VCID: 323D1FEC14A97CFB95F-8066
    
    1 Fault Found:
    1048578 - No Basic Setting 
              B2010 00 [009] - -
              [Steuergerät keine oder falsche Grundeinstellung / Adaption]
              Confirmed - Tested Since Memory Clear
                 Freeze Frame:
                        Fault Status: 00000001
                        Fault Priority: 6
                        Fault Frequency: 1
                        Reset counter: 52
                        Mileage: 145799 km
                        Date: 2020.06.24
                        Time: 21:00:53
    
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway (J533)       Labels:* None
       Part No SW: 4G5 907 468 F    HW: 4G0 907 468 AC
       Component: J533--Gateway H14 0083  
       Revision: --------    Serial number: 00000001924747
       Coding: C0CD074418
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_GatewPkoUDS 001028
       ROD: EV_GatewPkoUDS_001_AU57.rod
       VCID: 38292DC4F2D596ABABB-806C
    
       Battery Monitoring Control Module: 
       Subsystem 1 - Part No SW: 8T0 915 181     HW: 8T0 915 181 
       Component: J367-BDMHella  H03 8041 
       Serial number: 7606347103          
    
       Voltage stabilizer: 
       Subsystem 2 - Part No SW: 8K0 959 663 F    HW: 8K0 959 663 F
       Component: J532_DCDCStab  H23 0022 
       Serial number: 150512000000000001CF
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 20: High Beam Assist. (J844)       Labels: None
       Part No SW: 4H0 857 511     HW: 4H0 857 511 
       Component: FLA           H04 0021  
       Revision: AA001002    
       Coding: 04028264747464545425363E00
       Shop #: WSC 02391 785 00200
       VCID: 678BBEB8EF6BC953F21-8032
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 28: HVAC, Rear (E265)       Labels:* 4G0-919-158.clb
       Part No SW: 4G0 919 158 Q    HW: 4G0 919 158 Q
       Component: KLIMA FOND    H08 0112  
       Serial number: 11071500040089
       Coding: 22
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_ClimaContrUnitRearUDS 003004
       ROD: EV_ClimaContrUnitRearUDS_003.rod
       VCID: 3D273CD0DDF7B38378D-8068
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 3B: Sensor Elect. (J849)       Labels: 4G0-907-637.clb
       Part No SW: 4G0 907 637 H    HW: 4G0 907 637 D
       Component: SARA 3D       H04 0056  
       Revision: --------    Serial number: EJ1BPA720JNZC6
       Shop #: WSC 00000 000 00000
       ASAM Dataset: EV_SARA2 005012
       ROD: EV_SARA2.rod
       VCID: 33331AE8EBB375F39E9-8066
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver (J386)       Labels:. 4H0-959-793.clb
       Part No SW: 4G8 959 793 J    HW: 4G8 959 793 G
       Component: TSG FA        H03 0507  
       Revision: --------    Serial number: --------------
       Coding: 011C16015C01620002080002
       Shop #: WSC 02391 785 00200
       VCID: 47CB5E388FABE953D21-8012
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 44: Steering Assist (J500)       Labels:| 4G0-909-144.clb
       Part No SW: 4G0 909 144 S    HW: 4G0 909 144 G
       Component: RCEPS         H43 0012  
       Revision: 00001000    Serial number: 0026987174
       Coding: 101000010001
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_RCEPS 009013
       ROD: EV_RCEPS_009.rod
       VCID: 392F28C0C9DF8FA3545-806C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv. (J393)       Labels:. 4H0-907-064-46.clb
       Part No SW: 4H0 907 064 GN    HW: 4H0 907 064 GN
       Component: BCM2 2.0      H37 0572  
       Revision: 00002001    Serial number: 0373922814    
       Coding: 013B0622A0B93080C320090400010F470000000000000000000000000000
       Shop #: WSC 02391 785 00200
       VCID: 7BA3F2C883E37DB3069-802E
    
       Subsystem 1 - Part No: 4G0 951 177 A
       Component: Sensor, DWA  005 0002 
    
       Subsystem 2 - Part No: 1K0 951 605 C
       Component: LIN BACKUP HO  H05 1501 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 47: Sound System (J525)       Labels: None
       Part No SW: 4G0 035 223 C    HW: 4G0 035 223 A
       Component: BOSE-G3-C7    H07 0160  
       Revision: CJ007001    Serial number: 00000000177406
       Coding: 030000
       Shop #: WSC 02391 785 00200
       VCID: 1D67DC507DB7D38358D-8048
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass. (J387)       Labels:. 4H0-959-792.clb
       Part No SW: 4G8 959 792 J    HW: 4G8 959 792 G
       Component: TSG BF        H03 0507  
       Revision: --------    Serial number: --------------
       Coding: 011C16015E01620002080002
       Shop #: WSC 02391 785 00200
       VCID: 46D5533C88A1F05B297-8012
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 53: Parking Brake (----)       Labels: 4H0-907-801.clb
       Part No SW: 4H0 907 801 H    HW: 4H0 907 801 A
       Component: EPB-4         H04 0015  
       Revision: --------    Serial number: 00000001535140
       ASAM Dataset: EV_ParkiBrake 001028
       ROD: EV_ParkiBrake_VW51.rod
       VCID: 2D070C900D972303C8D-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 55: Headlight Range (J745)       Labels:| 4H4-907-357-V2.clb
       Part No SW: 4H4 907 357 E    HW: 7P6 907 357 B
       Component: MxB-ECU       001 0100  
       Revision: --------    Serial number: --------------
       Coding: 04FE02102A600200
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_HeadlRegulAUDIMXBAU64X 005009
       ROD: EV_HeadlRegulAUDIMXBAU64X_005_AU57.rod
       VCID: 343119F4EEBD72CB873-8060
    
       Led Headlamp Powermodule Left: 
       Subsystem 1 - Part No SW: 7PP 941 472 J    HW: 7PP 941 472 J  Labels: 3D0-941-329.CLB
       Component: LED LeiMo li.  H07 7560 
       Coding: E01E00
    
       Led Headlamp Powermodule Right: 
       Subsystem 2 - Part No SW: 7PP 941 472 J    HW: 7PP 941 472 J  Labels: 3D0-941-329.CLB
       Component: LED LeiMo re.  H07 7560 
       Coding: E01E00
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 5F: Information Electr. (J794)       Labels: Redir Fail!
       Part No SW: 4G1 035 192 A    HW: 4G1 035 192 A
       Component: RMC Nav Plus  H61 0139  
       Coding: 0101010101415B47082B060301020100000000
       Shop #: WSC 02391 785 00200
       VCID: 211FE0A041CFF7637C5-8074
    
       Subsystem 1 - Part No: 8X0 919 884 H
       Component: P28-50-14.06  0001 
    
       Subsystem 2 - Part No SW: 4G0 919 603 B    HW: 4G0 919 603 B
       Component: DU6 Basic  H43 0084 
       Serial number: 9464F/0F2718255     
    
       Subsystem 3 - Part No SW: 4G2 919 610 E    HW: 4G2 919 610 E
       Component: E380 BDT C7  H20 0250 
       Serial number: 90349OG90000W       
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 62: Door, Rear Left (J388)       Labels:. 4H0-959-795.clb
       Part No SW: 4G8 959 795 J    HW: 4G8 959 795 G
       Component: TSG HL        H03 0507  
       Revision: --------    Serial number: --------------
       Coding: 010814004001620002080002
       Shop #: WSC 02391 785 00200
       VCID: 49CF580099BF1F23C45-801C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 6D: Trunk Elect. (----)       Labels:* Redir Fail!
       Part No SW: 4G9 959 107 C    HW: 4G9 959 107 B
       Component: HDSG-Modul    H05 0151  
       Revision: 14005001    Serial number: 190501059
       Coding: 093205C010
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_HDSGAu572 001022
       ROD: EV_HDSGAu571.rod
       VCID: 363523FCF8C160DBB97-8062
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 72: Door, Rear Right (J389)       Labels:. 4H0-959-795.clb
       Part No SW: 4G8 959 795 J    HW: 4G8 959 795 G
       Component: TSG HR        H03 0507  
       Revision: --------    Serial number: --------------
       Coding: 010814004001620002080002
       Shop #: WSC 02391 785 00200
       VCID: 49CF580099BF1F23C45-801C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address AC: Reductant Control (J880)       Labels: 4G0-907-355.clb
       Part No SW: 4G0 907 355 G    HW: 4G0 907 355 B
       Component: SCR-Stg-G2    H10 0013  
       Revision: 00000000    Serial number: 151730179
       ASAM Dataset: EV_RDCMA00100 008040
       ROD: EV_RDCMA00100.rod
       VCID: 2F3B1698079B5113FA1-807A
    
    No fault code found.
    
    End----------(Elapsed Time: 01:47, VBatt start/end: 12.9V/13.7V)-----------

  2. #2
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    Hi Ben Pine,
    It means your AC compressor clutch is not powered, although without looking at a some tech info I am surprised it has a clutch and is not variable geometry. So look at your handbook and check the fuses, get a test light and wiring diagram and load test the wiring following the wiring diagram.
    Regards HMC

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  4. #3
    Ross-Tech Employee
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    Voltage terminal 30: 13.83 V
    A/C clutch-Remaining run time for play protection: 0.0 s
    A/C clutch-Status: On
    A/C clutch-Supply voltage: 13.5 V
    A/C clutch-Current power consumption: 0.000 A
    Supply voltage to the clutch is measured at battery voltage. Clutch current is zero....

    Either there is a blown fuse, or a connection to the clutch has failed, or the clutch has gone bad and is now an open coil, or the least likely is that the drive transistor circuit in the ECU has failed.

    Inspect for a blown fuse - need wiring diagrams to figure out which one.
    Inspect the wiring for a loose/broken connection.
    Test the clutch coil by unplugging the connector and then using DVOM, measure the coil resistance. The value should be found in repair info. At a guess, expect a couple ohms.
    If the clutch coil has resistance, then you either have a broken wire back to the control module, a blown fuse, or a failed control module.

    For complete wiring information, go to erwin and download the wiring diagrams.

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  6. #4
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    Thanks for the very quick advice gents.

    Unfortunately it isn't the fuses , that would of been a nice easy fix.

    I've never heard of erwin before .... but have found their website so will register and download the drawings

  7. #5
    Ross-Tech Employee Jef's Avatar
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    Another crappy sketch appears:



    Is the wire from terminal T20c/16 to the AC compressor (N25) good? Do you have continuity (ohm test) through the N25 itself?
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  9. #6
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    Hi Jef,

    thanks for the info although i'm not sure what an N25 is.

    I do have a clutch on the air con compressor and it spins easily by hand as it should. I have tested the power to the clutch coil and I have power when the air con is switched on. Next job is to test the coil itself... once i can remove the under tray (when the spline sockets are delivered)

    Ben

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  11. #7
    Ross-Tech Employee Jef's Avatar
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    https://www.ross-tech.com/training/

    Watch the last 2 videos and also print out the Wiring Diagram Training PDF so you can follow along with the video.

    0557 - A/C clutch
    B1488 15 [009] - Open or Short to Plus

    So the HVAC (J255) is saying is doesn't have a good electrical path from T20c/16 to ground. This electrical path passes right though the AC clutch (N25). So maybe a broken wire? Maybe a rotted terminal? Maybe a burnt up N25? The J255 isn't smart enough to know just what the problem is, but knows along that specific electrical path is not good.
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  13. #8
    Ross-Tech Employee DrPeter's Avatar
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    Hello,

    This Ross-Tech forum page should be of some help for fault codes that end in "Open or Short to Plus".

    Testing - Open Circuits, Short to Ground or Positive, etc....

    Hope this helps,

    drpeter

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  15. #9
    NostraJackAss Jack@European_Parts's Avatar
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    European Parts Emporium/Performance / Immobilizer Solutions EPE
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    Specializing in Custom Services IE: "welding-fabrication" / EPA-SMOG Update or Pass-Thru-Programming / Data Transfer / Immobilizers & OEM Quality Parts
    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
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  17. #10
    Ross-Tech Employee Dana's Avatar
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    Adding to the above suggestions, even though this is intended for newer systems using N280-Refrigerant Regulating Valve (i.e. variable geometry per post #2) the incandescent light bulb test absolutely applies:

    https://forums.ross-tech.com/showthr...he-HVAC-Season

    If N25 (the compressor clutch) has a 2 terminal connector the bulb will allow you to test both the power to the clutch -and- the ground to it. (This helps rule out a problem on the ground side when dealing with a conventional clutch.)

    However, if the clutch has a single power wire connector as per Jef's brilliant illustration it would be far less likely that a ground specific problem exists but you might want to use the compressor housing as test light ground rather than another ground source.

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