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Old 08-15-2003, 23:39   #1 (permalink)
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ECU and disconnecting the battery

I've seen from the manual that you should ensure the ECU memory is kept intact while you disconnect the battery.

If you don't, what IS the result? Does the ECU need to be "reprogrammed"?

Specifically, a 1989 EA 3.9 MPI.

Thanks.
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Old 08-16-2003, 03:40   #2 (permalink)
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Re: ECU and disconnecting the battery

It will relearn in time but it may be difficult to start plus if its a four speed auto you will need to reset the transmission. Just go to an auto parts place and buy one of those things that allow you to plug a 9 Volt battery into the cigarette lighter. Of course if you have a battery backed alarm system like I have you'll find the alarm battery will also keep the ECU memory alive.
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Old 08-16-2003, 23:41   #3 (permalink)
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Re: ECU and disconnecting the battery

aussie blue, why does tranny need resetting?

and how is it done?
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Old 08-16-2003, 23:47   #4 (permalink)
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Re: ECU and disconnecting the battery

It is quite ok to disconnect the battery.
All what happens is the ECU needs to re-learn the current status of the engine, as certain variables change as the engine wears.
This will only take a 100 or so k's of driving.

Rick.
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Old 08-17-2003, 05:01   #5 (permalink)
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Re: ECU and disconnecting the battery

It'll run fine if you disconnect the battery, as Soxx said it will only forget the minor things, mostly to do with compensating for engine wear. Takes very little time to relearn it.
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Old 08-17-2003, 07:45   #6 (permalink)
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Re: ECU and disconnecting the battery

To clear and reset throttle calibration with ignition on engine off go through the following sequence:
Manual 1
Switch to economy
Manual 2
Switch to performance
Manual 3
Switch to economy
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Old 08-17-2003, 16:49   #7 (permalink)
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Re: ECU and disconnecting the battery

I ws under the impression the throttle calibration was only needed for the integrated engine/box computers?
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Old 08-17-2003, 23:17   #8 (permalink)
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Re: ECU and disconnecting the battery

No; it's needed for all M85/95 ECU.
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Old 08-18-2003, 04:22   #9 (permalink)
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Re: ECU and disconnecting the battery

Well I've never done it in EAs/most EBs and the shift schedules haven't been affected.
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Old 08-18-2003, 04:27   #10 (permalink)
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Re: ECU and disconnecting the battery

Work in my NB (never tried the NC).
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