GM OBD1 Systems
ERASING DTCs
3120d 95
7.
If more than one code was retrieved, press the DTC button, as
necessary, to display additional codes one at a time.
In the case of long code definitions, a small arrow is shown in the
upper/lower right-hand corner of the code display area to indicate
the presence of additional information. Use the
button to view
the additional information.
Code 12 will always be present and it has one of the following meanings:
If code 12 is the only DTC retrieved and your vehicle "STARTS OK"
then code 12 indicates system "PASS" and all computer control
systems are functioning properly.
If code 12 is present and your vehicle "DOES NOT START", then it
may indicate a problem with the ignition control system.
8.
Disconnect the Diagnostic Tool from the vehicle and turn the ignition
key OFF.
9.
To prolong battery life, the Diagnostic Tool automatically shuts "Off"
after approximately three minutes with no button activity. The DTCs
retrieved will remain in the Diagnostic Tool's memory, and may be
viewed at any time. If the Diagnostic Tool’s batteries are removed,
or if the Diagnostic Tool is re-linked to a vehicle to retrieve codes,
any prior codes in its memory are automatically cleared.
10.
Follow the testing and repair procedures outlined in the vehicle's
service repair manual to correct "hard" DTCs. Codes should be
addressed and eliminated in the order they were received, erasing
and retesting after each repair is made to be sure the fault was
eliminated. Code 12 will appear alone when no other fault codes are
present.
It may be necessary to test drive the vehicle to reset "hard" fault
codes 13, 15, 24, 44, 45, and 55 after they have been erased.
Whenever codes 51, 52, 54, or 55 are displayed with other
codes, troubleshoot and eliminate the "50 Series" codes first,
then proceed with the lower numbered codes.
ERASING DTCs
When the Diagnostic Tool's ERASE function is used to erase
DTCs from the vehicle's on-board computer, manufacturer
specific data (where applicable) is also erased.
If you plan to take the vehicle to a service center for repair, DO NOT
erase the codes from the vehicle's computer. If the codes are erased,
valuable information that might help the technician troubleshoot the
problem will also be erased.
Erase DTC’s from the computer’s memory as follows:
1.
Connect the Diagnostic Tool to the vehicle’s DLC. Press the ENTER
button to continue.
Summary of Contents for 3120d
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