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Thread: ECU broken ? or not...

  1. #1
    Junior Member
    Join Date
    Jun 2018
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    ECU broken ? or not...

    Hi , need some urgent help!

    My xj6 3,2 1991 doesent start, the fuel pump relay is not energized on the coil from ECM. Wiring checked.
    Is this defenitely a broken ECM or would it be the same result if crank position sensor is broken?

    Engine cranks
    Fuel pump is running when relay is forced
    No fault codes
    No spark
    Inertia switch ok

    ECM part nr is DBC6472 , if you have one to sell im interested to buy one.

    Best regards/willep

  2. #2
    Senior Member rchiv's Avatar
    Join Date
    Feb 2013
    Orpington, Kent
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    Hi Willep, Welcome to the forum.

    What code reader are you using. If it was an ECU fault then you would have a code of some sort or a failure to read ECM. It looks like a security immobilizer problem rather than an ECU fault.
    As the engine turns over it eliminates the Inertia switch.
    Crank sensor would not stop the fuel pump or spark. But would have a code as well.

    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 112K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
    Simple Autofold Mirrors on Locking,

  3. #3
    Senior Member
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    Apr 2016
    Near Berlin
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    Has anybody recently deleted the codes or has this just appeared out of the blue?
    Grumpy Old Git
    “When a government is dependent upon bankers for money, they and not the leaders of the government control the situation, since the hand that gives is above the hand that takes. Money has no motherland; financiers are without patriotism and without decency; their sole object is gain.”
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