TS CF3 wont start - OBD code U1600 - Alfa Romeo Forum
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Old 23-05-09
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TS CF3 wont start - OBD code U1600

Need some help guys - i seem to have killed the big lass

I pulled the inlet manifold off today to reseal it to see if that would help the smoky mornings i've been having lately and when i popped it all back together the bugger refused to start. I scanned for codes and got U1600 which after a quick search seems to be immobiliser related....i cleared the code and tried again but still no joy

Anyway, you guys got any clues? I'm pretty sure i plugged everything back in where it came from but it's not liking something i've done

The car is a CF3 twinnie BTW...


'02 156 1.8
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Old 23-05-09
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Re: TS CF3 wont start - OBD code U1600

Did you unplug the ecu plugs when you were working on the inlet manifold?
If you did,check that you havent bend any of the pins,when you put them back.
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Old 23-05-09
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Re: TS CF3 wont start - OBD code U1600

Also make sure the crank sensor plug is connected back up correctly.
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Old 23-05-09
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Re: TS CF3 wont start - OBD code U1600

Yup - ecu was unplugged...did take the plugs back off in case there were any dodgy pins but seemed okay. Which is the crank sensor connector?
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Old 23-05-09
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Re: TS CF3 wont start - OBD code U1600

Originally Posted by niallmoran View Post
Yup - ecu was unplugged...did take the plugs back off in case there were any dodgy pins but seemed okay. Which is the crank sensor connector?
Crank sensor is the brown one on the inlet manifold.
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Old 23-05-09
niallmoran's Avatar
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Re: TS CF3 wont start - OBD code U1600

I'll have a wee check on that but I think it was fine...any other suggestions guys?
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Old 24-05-09
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Re: TS CF3 wont start - OBD code U1600

she lives!! Disconnected the battery for a wee while, rechecked all connections, cleared the code and all seems fine....well once i'd reconnected the vacuum home to the throttle body

Just need to see if the morning smoking improves now....
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Old 31-05-09
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Nice one! Good luck for stopping smoking
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Old 07-06-09
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i know you have the issue resolved:

FYI: u1600 is the immobiliser

when you disconnected the ecu, did you disconnect the battery 1st?

if not,tut, tut

if you did, ignore the tut, tut remark .... could be a sign that the immobilsier antenna has a dodgey connection
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Old 12-09-11
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Unknown faults

We are the proud owners of 08 Alfa Romeo GT 2.0 JTS, just purchased last week. Engine light has just come on, just had it put on the diagnostic machine, and has come up with unknown faults, the 3 x codes are:- U1600, P1172, P1175. The car drives ok and are causing no problems as we know. Could anyone please advise. Thank You Karen
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Old 12-09-11
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http://www.alfaowner.com/Forum/alfa-...ror-codes.html (Hmm. Is it really P1175 and P1172 error codes?)

If your car starts ok,ignore the U1600 one,quite often it appears if you turn the key in the ignition too quick before the immo light goes out.
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