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Old 11-25-2014, 12:49 PM   #1
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hand shake reset

With the battery out for winter (wimper...sniffle), is it worth while to perform a hand shake reset of the ECU while the opportunity is there? Is there anything adverse to having the pos. and negative leads linked together all winter???
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Old 11-25-2014, 12:58 PM   #2
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Thats not a hand over, its a hard reset, big difference.
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Old 11-25-2014, 03:38 PM   #3
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Jake, what is the difference between the two?
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Old 11-25-2014, 04:25 PM   #4
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Hand job?
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Old 11-26-2014, 10:27 AM   #5
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A hand over is done electronically, it requires a scan tool thats properly equipped for the task, like an Autologic.

A "hard reset" is done by removing the battery leads and connecting them together to drain all the energy from the DME and various capacitors throughout the car.
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Old 11-26-2014, 09:27 PM   #6
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Okay pardon the incorrect terminology....is this hard reset of value as far as establishing a fresh learning cycle where intake and exhaust modifications that have been made along the way can be fully and correctly accommodated by the ECU?
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Old 12-03-2014, 10:19 AM   #7
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Technicians are taught to never let the battery go dead or disconnect the terminals in Network/CAN bus cars (especially Mercedes), because you can trash a control unit on the interior bus if the power is removed while its going to sleep. The terminals should be kept hot with a booster pack and jumper wires during a battery replacement.

Some computers may be "stuck on stupid" even after resetting with the scan tool, requiring a hard reset. For example, if the dashboard would be indicating a transmission malfunction, and you perform the repair and fix the codes, the light may continue to stay on even though faults are no longer stored in the transmission ECU. A hard reset corrects this.

Why are you disconnecting the battery? Why not leave a trickle charger on it?
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Old 12-03-2014, 12:58 PM   #8
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Last edited by jaykay; 12-03-2014 at 01:00 PM. Reason: Dup
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Old 12-03-2014, 12:59 PM   #9
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I pull the batt every winter as there is no charge source to be had in the storage location. I have tried rotating power packs plus a trickle in the past but they seemed to have just barely kept the batt. alive and led to sulphication
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