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Mitsubishi Colt 1.5 2006 - Non start - Fixed #

Posted by John Hall on November 21, 2014, 6:48 pm

Year of Manufacture *: 2006
Engine Size and Code *: 1500 4A91 135.957
( Optional) Fault Codes: U1100

Customer recovered vehicle, cut out while driving and wont start !

Global scan revealed no communication with engine and "U1100 CAN timeout with engine control" in most other modules.

Removed chip from key to check if immobiliser noticed it was missing and fault logged in that for transponder missing, assuming immobiliser working ok.

Obtained wiring diagram, checked all supplies, earths, relay operation and scoped CAN wires with unit connected, all appeared ok.

Suspecting fault with engine control unit, anybody else had similar issues with these please ?

Re: Mitsubishi Colt - Non start

Posted by Alan Ganter <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3444' width='330' height='300' border=0 style='border:none;'> on November 23, 2014, 2:27 pm, in reply to "Mitsubishi Colt - Non start"
Alan Ganter

Did you scope the CAN lines while reqesting coms from a scan tool.

You can determine if the request is correct.

If it is still correct and powers and earths are all good then it looks like a ECU fault.

Can you open it up and have a look?

Re: Mitsubishi Colt - Non start

Posted by John Hall <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3023' width='330' height='300' border=0 style='border:none;'> on November 23, 2014, 8:28 pm, in reply to "Re: Mitsubishi Colt - Non start"

Only scoped it whilst with connector on and off control unit, never tried it during communication - will try that and check !

Yes opened up and checked inside - all looks ok.

Fixed #

Posted by John Hall on April 16, 2015, 5:59 pm, in reply to "Re: Mitsubishi Colt - Non start"
Edited by board administrator April 17, 2015, 1:58 pm

Eventually fixed it, I was testing the power supplies with connector removed from control unit as difficult in-situ, eventually found the engine control relay was not been switched by the ECU when ignition was switched on. Had control unit checked and was told it was not repairable, wired up external relay to trigger engine control relay when ignition switched on and all works fine

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