Reset ECU

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Reset ECU

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Jaguar Forums >> Jaguar Models >> 2007+ XKR >> Reset ECU

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Reset ECU - 2/6/2008 7:30:39 AM

GHOSTRIDERXKR08

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Just in case I need to reset the computer, is there step by step instruction on how to do so? I know my other car you need to unplug the cables from the battery for awhile to reset and my MB I need to put the key in position 2, leave the gas pedal down for 5 seconds, turn the key back to position 0, release the gas pedal and leave the key in for 2 minutes.

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2008 XKR Coupe (Ebony/Charcoal)
2006 Mercedes SL65 AMG (Pewter/Charcoal)
2004 Mercedes E500
2002 Mercedes S500

Post #: 1

RE: Reset ECU - 2/6/2008 4:12:50 PM

FactoryJaguarTech

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Yeah to do a hard reset, you would disconnect battery negative for at least 5 minutes. Remember to programme windows when you are done.
This will not however clear out codes stored in the ECM.

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If it ain't broke, don't fix it!!!

(in reply to GHOSTRIDERXKR08)

Post #: 2

RE: Reset ECU - 2/6/2008 7:49:16 PM

GHOSTRIDERXKR08

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Thanks JaguarFactoryTech....you've been very helpful.

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Post #: 3

RE: Reset ECU - 11/17/2008 1:48:19 AM

auclutch

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hi, I also have an 08 XKR. Will resetting the ECU clear the check engine light? Once in a while I get the check fuel filler cap sign on and then it goes away followed by the check engine light. When I take it to the dealer they turn it back off but it''s a pain to go wait at the dealer. Can this be handled by just unplugging and replugging the battery?

thanks in advance.

(in reply to GHOSTRIDERXKR08)

Post #: 4

RE: Reset ECU - 11/17/2008 11:28:29 AM

whiteSTR

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From: Miami, FL
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Nope, unplugging the battery does not clear codes/check engine lights....

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White Jaguar S-Type R (Exhaust, Ported S/C, K&N, ECU ReTune SOON!)
MTM Audi TT Quattro (All forged, Big Turbo, Big Brakes, 27psi)
Orange Nissan 350Z (DPs, Exhaust, Clutch, Intake) (Dead)
1973 Duster (Stage 3+ T76 Turbo, Wilwoods, HKS, HIDs)

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Post #: 5

RE: Reset ECU - 11/17/2008 11:44:31 AM

BRUTAL

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CORRECT WHT, AND TO DO A HARD REBOOT YOU HAVE TO DISCHARGE THE CAPACITORS IN THE ECU(ALL ECUS) AND TO CORRECTLY DISCHARGE A CAPACITOR WHICH IS NOTHING MORE THAN A BATTERY YOU HAVE TO GIVE IT A PATH TO GROUND. TO DO THAT DISCONNECT THE NEGATIVE BATTERY TERMINAL FROM THE BATTERY AND MOMENTARILY TOUCH IT TO THE STILL CONNECTED POSITIVE, THIS GIVES ALL THE CAPACITORS A PATH TO GROUND AND WITH ERASES ALL VOLATILE MEMORY.(CK ENGINE LIGHT CODES ARE STORED IN NONVOLATILE SO THEY NO LONGER ERASE THIS WAY)SOMEBODY(JIM?) STICKY THIS SO IT DOESNT HAVE TO BE RETYPED ALL THE TIME(2ND TIME TODAY) AND YES LIKE FACTOTECH SAID, RESET, WINDOWS, CLOCK, SUNROOF, RADIO(MAKE SURE YOU HAVE CODE FIRST IF YOU HAVE AN ANTITHEFT UNIT) AND YOUR DONE. TO RESET CODES AND NOT GO TO THE DEALER, GO TO NEIGHBORHOOD AUTOPARTS STORE, MOST HAVE GENERIC SCANNERS THAT CAN TAKE CARE OF ALOT OF CODES THAT COMEUP, JUST WRITE EM DONE SO IF THEY RETURN YOU KNOW THE CAR IS CONTINUING TO SEE THE SAME PROBLEM

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Post #: 6

RE: Reset ECU - 11/17/2008 12:24:42 PM

whiteSTR

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From: Miami, FL
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Well put brutal..

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White Jaguar S-Type R (Exhaust, Ported S/C, K&N, ECU ReTune SOON!)
MTM Audi TT Quattro (All forged, Big Turbo, Big Brakes, 27psi)
Orange Nissan 350Z (DPs, Exhaust, Clutch, Intake) (Dead)
1973 Duster (Stage 3+ T76 Turbo, Wilwoods, HKS, HIDs)

(in reply to BRUTAL)

Post #: 7

RE: Reset ECU - 11/17/2008 5:11:29 PM

auclutch

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suprise suprise... last night I took the car out for a spin... no check engine light! wtf? fuel filler cap light turned off too. in any case, thanks BRUTAL for all of the great info. I saved it on my comp. so I don''t have to look it up again. you da man~~~

(in reply to whiteSTR)

Post #: 8