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Author Topic: codes-not present  (Read 1281 times)

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raywilb

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codes-not present
« on: 21 August 2009, 09:41:11 »
when a code-reader comes up with a code and states not present. does that mean the original fault is ok, but the code needs clearing. ta in advance.
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Jimbob

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Re: codes-not present
« Reply #1 on: 21 August 2009, 09:48:55 »
Can do, can also mean an intermittant fault that just doesnt happen to be presesnt that minute.

Clear it, if it comes back, then its time to investigate  :y
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1960darrenh

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Re: codes-not present
« Reply #2 on: 21 August 2009, 19:47:50 »
Got same problem
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TheBoy

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Re: codes-not present
« Reply #3 on: 22 August 2009, 10:25:01 »
Generally 3 common states:

PRESENT - ECU is currently detecting the fault (or in some cases has detected the fault during this session, but currently unable to confirm if still present)

INTERMITTENT - The fault has been seen to disappear then come back during this session. Often, status changes pretty quickly to PRESENT

NOT PRESENT (NP) - Fault has been detected 'recently'.  Can mean a present fault, but engine/ecu in a condition it can't check for it.

The definition of 'recently' can vary from this session to last 20 clean starts, or in one or 2 cases (particularly immobiliser codes), since codes were last cleared.
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