Author Topic: ECU Reset - Power Latch  (Read 9176 times)

Offline Freedom

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ECU Reset - Power Latch
« on: June 05, 2009, 06:28:10 pm »
Stolen from another forum...

hello all i work in the dealer network and upon reading alot of the posts you may find this info useful

How to reset all ecu's

this procedure is called a power latch

firstly turn on the ignition not engine running,
open bonnet remove battery positive lead and then turn off ignition.
then touch the positive lead to earth,this powers down all ecus and resets erasing intermittent faults in the process.then reconnect the battery lead.
if the vehicle doesnt start straight away leave the ignition on for 2-3 mins as it has gone into anti scanning mode.

upon starting the vehicle DO NOT TOUCH THE THROTTLE allow vehicle to idle until cooling fans cut in to allow the engine ecu to reset correctly and reprogramme the learning curve,then drive in all gears upto 4,000 rpm accellerating steadily.

as stated this resets all ecus so any electrical faults caused by conflict errors in programming will be erased and fixed.if the fault is still evident there is a problem that will need further diagnosis
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Offline The Wrinkly Ninja

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Re: ECU Reset - Power Latch
« Reply #1 on: June 06, 2009, 01:53:43 am »
Further to that, I'd suggest after reattaching positive lead, leave the car alone for another 2 minutes to let the ECU fully settle, before attempting to start.
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