Question about 1998 Chevrolet Lumina

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When i disconnect the battery to reset the ecu should i only disconnect the negative terminal

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That should do it! Make sure your theft deterrent is not on your radio before you disconnect the battery.

Posted on Nov 17, 2010


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How do I reset the immobiliser?

In many vehicles, disconnecting the negative terminal on the battery for 10 minutes with work. Remember, the intent of an immobilizer is to prevent a car from being moved... it won't start. Disconnecting the battery does the same thing and resets the ECU which works with the starter circuit. In some models, put the key in the ignition switch to the ACC position will do the same thing... this lets the car's ECU know that whoever wants to move the car, has the key so it is probably not a theft attempt.

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  • 2 Locate the negative battery terminal on the battery. This has a black wire and is identified by a negative "-" stamped on the battery housing.
  • 3 Disconnect the negative battery terminal using a box-end wrench and isolate it so it does not come back into contact with the negative battery post.
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2001 ford focus se. Charging system inicator came on briefly 3 times. Car cut out 25 min later. Recently replaced battery and terminals. Seems like alternator but after dying car wouldnt start 10 hrs later...

(this damages the ecu Disconnected negative terminal and car still ran) check and clean the alternator connections. and check the earths. light can come on if water has gotten into the alternator or the connection has come loose. you don't disconnect the battery when the engine is running as it can shock the ecu alternators have a built in voltage stabilizer but this only works with feed back from the battery no feed back it can convert ac instead of dc and blow up the ecu. it also damage other parts.

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You usually reset the computer by removing the negative battery terminal for about 5 minutes, then replace it. After this, your ECU (in teh next 40 strats) learn your drive mode.

Good luck, and rememeber tared the help.

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first try to reset the ecu, disconnect the negative battery terminal few minutes, then reconnect start engine and test

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