What counts as a 'trip'
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From: Monrovia
Originally Posted by Siepel,Jul 7 2006, 03:15 AM
Depending on which code, a 'trip' as you call it can consist of three times "key-on key-off", but in some cases three times a full "warm-up cycle" where the engine temperature must rise from roughly 100F to 180F.
It's not unlikely your short trips did not meet the full warm-up cycle criteria.
Take care,
Siepel
It's not unlikely your short trips did not meet the full warm-up cycle criteria.
Take care,
Siepel
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Joined: Feb 2001
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From: Brussels, Belgium
Originally Posted by SenderGreen,Jul 7 2006, 01:54 PM
Not disagreeing with you, but which DTC's that require multiple "driving trips" for the ECU to automatically clear, can be cleared using the "key-on key-off" method? That would seem to defeat the logic of the ECU requiring multiple trips if it could be fooled so easily.
Although I am not 100% sure on Honda cars, for instance if you disconnect the connector of the EVAP purge valve (MIL will go on immediately) and reconnect it again, at each new key-on it registers that the electrical circuit is intact (so the error is fully gone!). You can simply do the three key-on key-offs without even starting the car and it will count towards clearing the code as three 'trips'. This is not possible for sensors with plausibility checks (compare data against known, logical and expected values).
Take care,
Siepel
PS: @ dmw16: You have to drive three long trips, starting from a 'cold' car, in order for the car to automatically reset it's check engine code.
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From: BFE... literally :)
I have been geting the P1456 code several time in my 2003 lately, I do have a code reader and have the ability to erase it. However after talking witha couple of people it may be that I need to replace the cap itself. Perhaps that could fix your issue as well.
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Joined: Feb 2004
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From: Monrovia
Originally Posted by Siepel,Jul 9 2006, 01:15 AM
Some electrical disconnections of parts/sensors will only require that. In the OBD world there is a difference between the 'plausibility' checks and 'electrical circuit continuity' checks.
Although I am not 100% sure on Honda cars, for instance if you disconnect the connector of the EVAP purge valve (MIL will go on immediately) and reconnect it again, at each new key-on it registers that the electrical circuit is intact (so the error is fully gone!). You can simply do the three key-on key-offs without even starting the car and it will count towards clearing the code as three 'trips'. This is not possible for sensors with plausibility checks (compare data against known, logical and expected values).
Take care,
Siepel
PS: @ dmw16: You have to drive three long trips, starting from a 'cold' car, in order for the car to automatically reset it's check engine code.
Although I am not 100% sure on Honda cars, for instance if you disconnect the connector of the EVAP purge valve (MIL will go on immediately) and reconnect it again, at each new key-on it registers that the electrical circuit is intact (so the error is fully gone!). You can simply do the three key-on key-offs without even starting the car and it will count towards clearing the code as three 'trips'. This is not possible for sensors with plausibility checks (compare data against known, logical and expected values).
Take care,
Siepel
PS: @ dmw16: You have to drive three long trips, starting from a 'cold' car, in order for the car to automatically reset it's check engine code.
Registered User
Joined: Feb 2004
Posts: 874
Likes: 1
From: Monrovia
Originally Posted by Siepel,Jul 9 2006, 01:15 AM
Some electrical disconnections of parts/sensors will only require that. In the OBD world there is a difference between the 'plausibility' checks and 'electrical circuit continuity' checks.
Although I am not 100% sure on Honda cars, for instance if you disconnect the connector of the EVAP purge valve (MIL will go on immediately) and reconnect it again, at each new key-on it registers that the electrical circuit is intact (so the error is fully gone!). You can simply do the three key-on key-offs without even starting the car and it will count towards clearing the code as three 'trips'. This is not possible for sensors with plausibility checks (compare data against known, logical and expected values).
Take care,
Siepel
PS: @ dmw16: You have to drive three long trips, starting from a 'cold' car, in order for the car to automatically reset it's check engine code.
Although I am not 100% sure on Honda cars, for instance if you disconnect the connector of the EVAP purge valve (MIL will go on immediately) and reconnect it again, at each new key-on it registers that the electrical circuit is intact (so the error is fully gone!). You can simply do the three key-on key-offs without even starting the car and it will count towards clearing the code as three 'trips'. This is not possible for sensors with plausibility checks (compare data against known, logical and expected values).
Take care,
Siepel
PS: @ dmw16: You have to drive three long trips, starting from a 'cold' car, in order for the car to automatically reset it's check engine code.
Depending on which code, a 'trip' as you call it can consist of three times "key-on key-off", but in some cases three times a full "warm-up cycle" where the engine temperature must rise from roughly 100F to 180F.
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