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
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.
Roger
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, 116K Mods:- Electric Autofold Mirrors on Locking
Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945
Hi,
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.”
― Napoléon Bonaparte
2003 (botox) S type 3.0 sport with manual gearbox, as rare as rocking horse apples
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?
bad ECM could definitely brick the starting process
When cranking does the tachometer "pulse? I was told this indicates the CPS is outputting signal.
I believe the 2 second running of the fuel pump is controlled by the ECU and may indicate it is bad.
Check all grounds and insure voltage is getting to the ECU module...
Fuel pump is running when relay is forced
I assume you car just "died"-no spark--- one day... yeah that sounds like and electronic failure, they are sudden and with no warning...... make some of those prelim checks of voltages and grounds.... try and get a sub ECU as it is good to have a spare.
ALSO just unplug and replace all the ignition connectors... and LOOK... do they look reasonably clean... is there decent "friction" when reconnecting the connector?
Good cleaners are WD40 ELECTRICAL CONTACT CLEANER wont hurt any plastic parts...and
Deoxit GOLD G5
Have a clean and ground and voltage check.. if still nogo... get that spare ECU
Posting Permissions
Reply With Quote