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Thread: Beetle 1.6sr ecu? problem

  1. #1
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    Beetle 1.6sr ecu? problem

    The wife bought a 2002 beetle 1.6 sr (BFS engine code) out here in Seychelles.
    Ran an obdeleven diagnostic scan on it and cleared the engine management
    light related faults. Unfortunately the light returned on the second start up.

    Today whilst about to run a scan again i noticed fuse 43 (engine management and i think lambda sensors heating) was missing so i put the fuse from 42 (stereo) and ran a scan and cleared the faults. After this the car does not start but is turning over, fuel pump is not priming with the key and engine management light is not coming on with ignition.
    The fuel pump is priming for a few seconds with the door handle. Also ecu relay is clicking with ignition. Fuses 10 and 29 are fine with power coming to them. Obdeleven cannot now communicate with the engine module/ ecu.

    Any ideas gents?

  2. #2
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    After finding some information on ukmkivs forum i checked at the ecu connectors:

    Pin 1= earth, i also had earth.
    Pin 2= earth, i also had earth.
    Pin 3= 12v with ignition on, i only got 0.09v/0.10v
    Pin 62= 11v-14v with ignition off, i got 0.06v fluctuating to 0.10v. However with the ignition on i got 11.21v.

    I also checked fuses 28, 34 and 43 with no voltage when ignition is on or cranking.
    Then i checked fuses 5, 7 and 29 with ignition on and got a voltage reading. Also checked fuse 10 with ignition off and also got a voltage reading this is only after being on and then switched off with the key still in, if there is no key in the barrel then 0 volts.- Is this normal?

    Hoping by some miracle it is a quick fix as it is the only beetle on the islands and there is no VW dealership or specialist to turn to.
    Last edited by g60pops; 08-06-19 at 16:57. Reason: Fat fingers spelling mistake

  3. #3
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    Forgot to add also checked:
    pin 23 at the ecu and am getting 10.48v with ignition on and 0v when off.

    Pin 9 = 9.80v with ignition on.
    Pin 17= 10.62v with ignition on.
    Pin 80= 10.09v with ignition on.

    Then moved to the ecu relay J363 and checked terminal 30 as apparently this get power from fuse 10. I was not getting any power here. From here it is supposed to go to terminal 87 and onto the ecu terminal 3 (T121/3), where on my previous test i did not get power. Continuity from terminal 87 to T121/3 checked out to be fine.

    Running out of things to check!
    Any ideas?
    Last edited by g60pops; 08-06-19 at 12:21. Reason: Added more information.

  4. #4
    Administrator Keithuk's Avatar
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    First posts normally go in introductions else you could get a free fix and we never see you again!!!

    obdeleven isn't a good diagnostic tool.

    You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  5. #5
    Administrator Crasher's Avatar
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    I can’t check the wiring diagram until Monday.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
    2006 Polo GTI 1.8T, APR 95RON remap
    1988 Golf 2 GTI 16 valve, 2.2 with Weber Alpha injection
    1983 Golf 1 GTI 8 valve, 2 litre with Eurospec racing 42/36 head
    1972 1302LS auto 1641cc conversion

    Vile Invention

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:

  6. #6
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    Quote Originally Posted by Crasher View Post
    I can’t check the wiring diagram until Monday.
    No worries. I hope to run some tests on the ecu relay 428 tomorrow to be 100% that it is okay as i am now not sure it is clicking.
    Last edited by g60pops; 08-06-19 at 20:44.
    2002 Beetle 1.6 SR, BFS

  7. #7
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    Okay good news, all sorted and up and running.
    In my first post i said i put the fuse from 42(stereo) into 43 ( engine management, lambda heating etc). But after thinking it through i remembered that was not the case as the fuse was a 25 amp which i thought may be too high, so i had actually taken the fuse from 37 which was 10 amp. I did the fuse swap after the scan and before i cleared the codes.

    As a result of this there was no fuse in 37 which causes fuse 10 to then not send power to the ecu relay j363 (relay 429) terminal 30 which in turn does send power via terminal 87 (once the relay clicks) to the ecu pin 3 (T121/3).

    Fuse 37 shows as audio unit, convenience equipment, navigation system, S contact ( found this fuse info online for uk golf mk4s). But is some how linked to fuse 10.

    I hope this information helps anyone who comes across via a google search.

    So Crasher, no need for the wiring diagrams, but thank you so much for offering to check them. I really appreciated your offer.
    After the car started and i cleared a whole load of codes as a result of the ignition being on without the ecu connected i am now getting code P0342 , 01314 and C0200.
    Is it likely that i need to change the camshaft positional sensor -P0342?
    I could not see exactly where it is mounted on the engine, any ideas?
    Also when i searched on ebay i came across 2 different types??
    2002 Beetle 1.6 SR, BFS

  8. #8
    Administrator Crasher's Avatar
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    Check the cam timing.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
    2006 Polo GTI 1.8T, APR 95RON remap
    1988 Golf 2 GTI 16 valve, 2.2 with Weber Alpha injection
    1983 Golf 1 GTI 8 valve, 2 litre with Eurospec racing 42/36 head
    1972 1302LS auto 1641cc conversion

    Vile Invention

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:

  9. #9
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    Quote Originally Posted by Crasher View Post
    Check the cam timing.
    Sorry in advance for the stupid question( i am more a golf mk1 and mk2 guy), but do i check this with the obdeleven diagnostic thing or a physical inspection of the alignment marks on the pulleys?
    2002 Beetle 1.6 SR, BFS

  10. #10
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    Located the camshaft sensor at the back of the head near the throttle body.
    The plastic 3 pin connector is completely broken and missing with just the loose wires connected. Not sure if they are connected in the right order and/ or if the are touching each other and shorting out.
    Space it very tight in the engine bay so will have to have a proper look tomorrow after removing some bits to get access.

    Any chance anyone has a wiring diagram for the cam sensor three wires?
    2002 Beetle 1.6 SR, BFS

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