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Scanning OBD2 codes
Posted 03 March 2004 - 05:07 PM
How about clearing codes??? Do I need a scanner to clear the codes???
Posted 03 March 2004 - 07:28 PM
Posted 03 March 2004 - 07:29 PM
Clear them by disconnecting the battery and letting it drain overnight. (not sure on actual length of time but overnight works).
Posted 03 March 2004 - 07:44 PM
Originally posted by 99obw
MY '96 vehicles use OBDII, so you will need an OBDII code reader to read and clear the codes.
I thought the basic codes could still be pulled,stupid lying article,oh well my bad.
In regards to resetting the ECU,I have always disconnected the negative and just put my foot on the brake pedal for about a minute,seems to drain any power from hte system and has worked on all my cars,maybe the OBD II is different though?
Posted 03 March 2004 - 07:45 PM
Memory of a DTC (as it relates to illuminating
the MIL) is maintained until 3 consecutive
passing trips have been made. (The Enabling
Criteria was reached 3 times in a row and the
tests were performed with good results). The MIL
will turn off at this point.
The DTC will remain available for viewing with
the select monitor and the freeze frame
information associated with it for 40 warm up
The exception to this rule is if the code is
associated to misfire or fuel trim which will require
80 warm up cycles for full erasure."
Posted 03 March 2004 - 07:58 PM
Posted 03 March 2004 - 08:05 PM
DTC = diagnostic trouble code ( i.e. P0400, my favorite)
MIL = malfunction indicator lamp (check engine light)
"Before OBDII can begin to work the vehicle must
meet the “Enabling Criteria”. This is the vehicle
operating condition that must exist for the Engine
Control Module (ECM) to begin diagnostics.
“Enabling Criteria” will not be the same for all
diagnostics. For example; the ECM checks an
EGR solenoid as soon as the ignition is turned
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