DRIVEABILITY AND EMISSIONS 6E1-53
VERIFYING VEHICLE REPAIR
Verification of vehicle repair will be more
comprehensive for vehicles with OBD system
diagnostics. Following a repair, the technician should
perform the following steps:
1. Review and record the customer complaint for the
DTC which has been diagnosed.
2. Clear DTC(s).
3. Operate the vehicle within conditions noted in the
customer complaint.
4. Monitor the DTC status information for the specific
DTC which has been diagnosed until the diagnostic
test associated with that DTC runs.
Following these steps are very important in verifying
repairs on OBD systems. Failure to follow these steps
could result in unnecessary repairs.
READING DIAGNOSTIC TROUBLE
CODES USING A SCAN TOOL
The procedure for reading diagnostic trouble code(s)
is to use a diagnostic Scan Tool. When reading
DTC(s), follow instructions supplied by tool
manufacturer.
Clearing Diagnostic Trouble Codes
Important: Do not clear DTCs unless directed to do
so by the service information provided for each
diagnostic procedure.
If the fault that caused the DTC to be stored into
memory has been corrected, the Diagnostic Executive
will begin to count the “warm-up” cycles with no further
faults detected, the DTC will automatically be cleared
form the ECM memory.
To clear Diagnostic Trouble Codes (DTCs), use the
diagnostic Scan Tool “clear DTCs” or “clear
information” function. When clearing DTCs follow
instructions supplied by the tool manufacturer.
When a Scan Tool is not available, DTCs can also be
cleared by disconnecting one of the following sources
for at least thirty (30) seconds.
Notice: To prevent system damage, the ignition key
must be OFF when disconnecting or reconnecting
battery power.
• The power source to the control module. Examples:
fuse, pigtail at battery ECM connectors etc.
• The negative battery cable. (Disconnecting the
negative battery cable will result in the loss of other
on-board memory data, such as preset radio
tuning).
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