How do you clear historical codes on a 95?

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Aug 7, 2009 | 08:59 AM

-=Tom=-

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Racer

Joined: Oct 2008

Posts: 299

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From: Ottawa Ontario

How do you clear historical codes on a 95?

How do you clear historical codes on a 95? I have two historical codes from a malfunctioning o2 sensor and can't figure out how to clear them. I follow the procedures in the FSM but must be doing something wrong.

One of the historical codes has been there ever since I bought the car and it was because of a faulty o2 sensor for the previous owner.

Thanks.

Aug 7, 2009 | 09:39 AM

runner140*

Le Mans Master

Joined: Mar 2004

Posts: 8,700

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From: Ft. Lauderdale Fl

Disconnect the negative battery terminal..... wait a minute, then reconnect.

Aug 7, 2009 | 09:59 AM

-=Tom=-

Thread Starter

Racer

Joined: Oct 2008

Posts: 299

Likes: 1

From: Ottawa Ontario

Quote:

Originally Posted by runner140*

Disconnect the negative battery terminal..... wait a minute, then reconnect.

I can confirm this doesn't work. At least not on my car. I've left it disconnected overnight when I changed my fuel filter last week and had gas everywhere and the historical codes are still there.

Oh yeah all last winter when it was stored I had it disconnected as well and the historical codes are still there so I don't think I can leave it disconnected much longer than several months.

Aug 7, 2009 | 10:13 AM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

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From: Australia

Quote:

Originally Posted by -=Tom=-

I can confirm this doesn't work. At least not on my car.

How about this way?

http://www.digitalcorvettes.com/foru...56&postcount=9

Aug 7, 2009 | 01:34 PM

-=Tom=-

Thread Starter

Racer

Joined: Oct 2008

Posts: 299

Likes: 1

From: Ottawa Ontario

Quote:

Originally Posted by rodj

How about this way?

http://www.digitalcorvettes.com/foru...56&postcount=9

Thanks! I could swear that's what the FSM says and I did it many times but it didn't work in the past. I just went out and did exactly what it says on that page step by step and my historical codes are now history!

Thanks again for the help.

Aug 8, 2009 | 02:28 PM

josephf31

Pro

Joined: Mar 2008

Posts: 579

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From: High Bridge New Jersey

Try

Quote:

Originally Posted by -=Tom=-

removing the ECM fuse for a minute or so then replace it, works for me on my '91

Aug 9, 2009 | 12:13 AM

joe wilson

Instructor

Joined: Sep 2004

Posts: 216

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From: Linton Indiana

Your car doesn't by any chance have OBDII does it? If so you'll have to erase it with a scanner.

Aug 9, 2009 | 03:16 AM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

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From: Australia

Quote:

Originally Posted by joe wilson

If so you'll have to erase it with a scanner.

To clear the codes on OBDII without a scanner.

1. With ignition "off" ground terminal #12 of the DLC (use bent paper clip to connect pin 4 to pin 12)
2. Turn ignition "on".
3. Press trip/odo button on the DIC until 1.7 appears in the trip monitor area of the instrument cluster.
4. Press eng/met button on the DIC & hold until "---" appears in the speedometer area of the cluster, this will clear CCM DTC'S.

To clear PCM/ECM codes do the following:
1. Press the trip reset button on the DIC until the desired system is displayed. In this case it will be 4.0.
2. Press trip/odo button on the DIC until the desired diagnostic mode (4.7) is displayed on the trip monitor area of the cluster.
3. Press & hold the eng/met button on the DIC until "---" is displayed in the speedometer area of the cluster, this will clear PCM codes.

To clear ABS/ASR codes do the following:
Same as above but you’re looking for “9.7” on the trip odo