156 JTS, ABS/VDC, won't start, can't read codes - Alfa Romeo Forum
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(Post Link) post #1 of 3 Old 14-02-16 Thread Starter
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Alfa 156 2.0 JTS

156 JTS, ABS/VDC, won't start, can't read codes

Hi all,

I'm new to the forum and have been massively excited about my new 156 until earlier today; I may have broken it. I'd be hugely grateful for some guidance on how I can fix it.

Drove it last on Thursday, no problems at all.

Went out to test fit a new baby seat today so moved the passenger seat about then finished up and locked the car up. Went back out later today as I wanted to check the low and high speed fan circuits were working. My understanding was that the ECU grounds pin 86 of the relays in the engine bay. So:
  • Pulled the big black 50A FAN relay on the far left of the box out, got a piece of wire, tucked it in the pin86 connector on the relay socket and refitted the relay.
  • Touched the other end of the wire on Batt earth, nothing happened. Ignition was off at the time I think.
  • Switched the ignition on, and heard the 2 beeps, 1 for ABS and one for VDC warnings on the info screen.
  • Tried turning engine over, turned ok, didn't fire.
  • Disconnected Batt earth for 50 mins, reconnected, same warnings.
  • Tried connecting my Maxiscan bluetooth EOBD adaptor that I've used on this car before fine, says it can't connect to the ECU so I can't read any codes.
  • Checked fuel cutoff under passenger seat, pressed it but no difference.
  • Swapped relays around in the engine bay to rule out a dodgy relay, no difference.
  • Checked the engine earth on the gearbox, seemed fine, not sure if there's any more.
  • Measured battery voltage after only a few attempts at starting, 12.2V.
  • If I turn the key to MAR, the fuel pump doesn't prime.
  • I think the only warning light on the dash is the triangle shaped one, presumably for the ABS fault.

Any suggestions? I've heard a weak battery can produce faults but surely it wouldn't stop me from being able to read the ECU via the OBD adaptor? Surely I can't have fried the ECU in anyway. The 30A ECU fuse on the battery is fine and the pair of big fuses have continuity.

Any advice would be fantastic.

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(Post Link) post #2 of 3 Old 22-02-16 Thread Starter
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Alfa 156 2.0 JTS

An update to the below if its of any use to anyone doing a search - I found that the 7.5 amp fuse in one of the supplementary fuse boxes under the steering wheel had blown. Changed this, charged the battery, she fired up straightaway
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Nikolai is offline  
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This was almost exactly the same problem I had.

Would still be scratching around wondering why various OBD cables and the like wouldn't connect up!

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156 , abs or vdc , codes , jts , read , start

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