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  #1 (permalink)  
Old 22 Sep 2008, 12:15 pm
Peter Hucker
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Default How to reset ECU?

I wish to clear the ECU error log (I'm trying to trace an ABS sensor fault) - everything I've read says to pull a fuse or disconnect the battery. I've disconnected the battery overnight(!) but it still remembers the faults. If I can't clear the fault history, I can't see what any new faults are as I do things with the sensors. It's a Honda CR-V 1999 model in the UK, with a 2 pin ECU connector, i.e. pre-OBDII. I have an appropriate reading tool, which gives me the various error codes on the ABS light.
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  #2 (permalink)  
Old 22 Sep 2008, 04:14 pm
Sarah
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Default Re: How to reset ECU?


"Peter Hucker" <none@spam.com> wrote in message
newsp.uhv7knb74buhsv@fx62.mshome.net...
>I wish to clear the ECU error log (I'm trying to trace an ABS sensor
>fault) - everything I've read says to pull a fuse or disconnect the
>battery. I've disconnected the battery overnight(!) but it still remembers
>the faults. If I can't clear the fault history, I can't see what any new
>faults are as I do things with the sensors. It's a Honda CR-V 1999 model
>in the UK, with a 2 pin ECU connector, i.e. pre-OBDII. I have an
>appropriate reading tool, which gives me the various error codes on the ABS
>light.
>
>


I think you need to clear the fault with you diagnostic tool ?

Have you fixed the abs fault or traced what the fault is ?


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  #3 (permalink)  
Old 23 Sep 2008, 12:57 pm
Peter Hucker
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Default Re: How to reset ECU?

On Mon, 22 Sep 2008 22:14:50 +0100, Sarah <sarah@here.com> wrote:

>
> "Peter Hucker" <none@spam.com> wrote in message
> newsp.uhv7knb74buhsv@fx62.mshome.net...
>> I wish to clear the ECU error log (I'm trying to trace an ABS sensor
>> fault) - everything I've read says to pull a fuse or disconnect the
>> battery. I've disconnected the battery overnight(!) but it still remembers
>> the faults. If I can't clear the fault history, I can't see what any new
>> faults are as I do things with the sensors. It's a Honda CR-V 1999 model
>> in the UK, with a 2 pin ECU connector, i.e. pre-OBDII. I have an
>> appropriate reading tool, which gives me the various error codes on the ABS
>> light.
>>
>>

>
> I think you need to clear the fault with you diagnostic tool ?


The main dealer told me this model needs their computer to reset it, and disconnecting the battery won't do. I don't really believe them as nothing I've read suggests this is required.

> Have you fixed the abs fault or traced what the fault is ?


I cannot fix the fault without being able to reset the log. I currently have it stuck saying all 4 sensors have been open circuit at one point. I want to see one of them changing to not open circuit when I swap sensors, so I can establish which ones are broken (or more likely the wiring to them - all 4 sensors actually test ok on an oscilloscope).
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  #4 (permalink)  
Old 23 Sep 2008, 01:14 pm
Scott Dorsey
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Default Re: How to reset ECU?

Peter Hucker <none@spam.com> wrote:
>On Mon, 22 Sep 2008 22:14:50 +0100, Sarah <sarah@here.com> wrote:
>>
>> I think you need to clear the fault with you diagnostic tool ?

>
>The main dealer told me this model needs their computer to reset it, and disconnecting the battery won't do. I don't really believe them as nothing I've read suggests this is required.


No, the dealer is right. Some of the third-party scanning tools can reset
it as well as the tool the dealer has, though. You really need the right
tool.

>> Have you fixed the abs fault or traced what the fault is ?

>
>I cannot fix the fault without being able to reset the log. I currently have it stuck saying all 4 sensors have been open circuit at one point. I want to see one of them changing to not open circuit when I swap sensors, so I can establish which ones are broken (or more likely the wiring to them - all 4 sensors actually test ok on an oscilloscope).


If you get the correct scanning tool you should be able to see the sensor
data coming across the screen in realtime. This allows you to put the car
up, turn the wheels by hand, and look at what is coming into the computer.

If all four sensors have been open circuit at some point, look for a place
where all four sensor signals are being carried in the same cable harness
or the same connector. You'll find the problem there.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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  #5 (permalink)  
Old 23 Sep 2008, 01:23 pm
Peter Hucker
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Default Re: How to reset ECU?

On Tue, 23 Sep 2008 19:14:23 +0100, Scott Dorsey <kludge@panix.com> wrote:

> Peter Hucker <none@spam.com> wrote:
>> On Mon, 22 Sep 2008 22:14:50 +0100, Sarah <sarah@here.com> wrote:
>>>
>>> I think you need to clear the fault with you diagnostic tool ?

>>
>> The main dealer told me this model needs their computer to reset it, and disconnecting the battery won't do. I don't really believe them as nothing I've read suggests this is required.

>
> No, the dealer is right. Some of the third-party scanning tools can reset
> it as well as the tool the dealer has, though. You really need the right
> tool.


There are not a lot of 3rd party scanners for this car. 99% of those on sale are for OBDII compliant vehicles, which I have missed out on by one year. That's why I bought all three I found - none of them have a reset. All the manuals say to disconnect a fuse or the battery.

>>> Have you fixed the abs fault or traced what the fault is ?

>>
>> I cannot fix the fault without being able to reset the log. I currently have it stuck saying all 4 sensors have been open circuit at one point. I want to see one of them changing to not open circuit when I swap sensors, so I can establish which ones are broken (or more likely the wiring to them - all 4 sensors actually test ok on an oscilloscope).

>
> If you get the correct scanning tool you should be able to see the sensor
> data coming across the screen in realtime. This allows you to put the car
> up, turn the wheels by hand, and look at what is coming into the computer.


Any idea where I can get such a scanner? I've looked absolutely everywhere online and phoned several suppliers.

> If all four sensors have been open circuit at some point, look for a place
> where all four sensor signals are being carried in the same cable harness
> or the same connector. You'll find the problem there.


Only two were showing open cirucit - the rear two. I removed one rear and one front and took them to an electronics tech to test. He said they were identical which makes me think there is a wiring fault, and put me off taking it to the dealer to fix (as they just wanted to replace both rear sensors costing me 350 for no fix). Since I drove it while he had them for testing, the front right one became open circuit on the log. The front left became open circuit when I removed it to see if the log was being read correctly. I'm now out of good readings!

--


With the sun beginning to rise, the cabin of the jetliner was suddenly illuminated.
"Who turned on the ****ing lights?" a male passenger, who had been surly since boarding, snarled at a stewardess.
The girl had had enough of this particular character. "These are the breakfast lights, sir," she answered with forced sweetness.
"The ****ing lights are much dimmer, and you snored right through them."
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  #6 (permalink)  
Old 26 Sep 2008, 12:21 am
johngdole@hotmail.com
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Default Re: How to reset ECU?

How about disconnecting the battery for a minute. By 1999 you should
be able to do with the Radio fuse for a minute. I don't know about UK,
but in US by 1996 all are OBD-II. Check your engine hood decal.



On Sep 22, 10:15*am, "Peter Hucker" <n...@spam.com> wrote:[color=blue]
> I wish to clear the ECU error log (I'm trying to trace an ABS sensor fault) - everything I've read says to pull a fuse or disconnect the battery. I've disconnected the battery overnight(!) but it still remembers the faults.If I can't clear the fault history, I can't see what any new faults are asI do things with the sensors. *It's a Honda CR-V 1999 model in the UK, with a 2 pin ECU connector, i.e. pre-OBDII. *I have an appropriate readingtool, which gives me the various error codes on the ABS light.
>
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  #7 (permalink)  
Old 26 Sep 2008, 08:13 am
jim beam
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Posts: n/a
Default Re: How to reset ECU?

johngdole@hotmail.com wrote:
> How about disconnecting the battery for a minute. By 1999 you should
> be able to do with the Radio fuse for a minute. I don't know about UK,
> but in US by 1996 all are OBD-II. Check your engine hood decal.


fuse/battery are both "power supply". doesn't mean the ecu has volatile
memory though.



>
>
>
> On Sep 22, 10:15�am, "Peter Hucker" <n...@spam.com> wrote:
>> I wish to clear the ECU error log (I'm trying to trace an ABS sensor fault) - everything I've read says to pull a fuse or disconnect the battery. I've disconnected the battery overnight(!) but it still remembers the faults. If I can't clear the fault history, I can't see what any new faults are as I do things with the sensors. �It's a Honda CR-V 1999 model in the UK, with a 2 pin ECU connector, i.e. pre-OBDII. �I have an appropriate reading tool, which gives me the various error codes on the ABS light.
>>
>>

>
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  #8 (permalink)  
Old 26 Sep 2008, 01:17 pm
Peter Hucker
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Posts: n/a
Default Re: How to reset ECU?

I've disconnected the battery overnight!

In UK it was 2000 we got OBD-II.


On Fri, 26 Sep 2008 06:21:53 +0100, <johngdole@hotmail.com> wrote:

> How about disconnecting the battery for a minute. By 1999 you should
> be able to do with the Radio fuse for a minute. I don't know about UK,
> but in US by 1996 all are OBD-II. Check your engine hood decal.
>
>
>
> On Sep 22, 10:15*am, "Peter Hucker" <n...@spam.com> wrote:
>> I wish to clear the ECU error log (I'm trying to trace an ABS sensor fault) - everything I've read says to pull a fuse or disconnect the battery. I've disconnected the battery overnight(!) but it still remembers the faults. If I can't clear the fault history, I can't see what any new faults are as I do things with the sensors. *It's a Honda CR-V 1999 model in the UK, with a 2 pin ECU connector, i.e. pre-OBDII. *I have an appropriate reading tool, which gives me the various error codes on the ABS light.
>>

>>

>
>
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