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GM OBD1 Systems
CODE RETRIEVAL PROCEDURE
48
- Verify the ignition is ON.
- Check the cable connections at the Scan Tool and at the
vehicle’s DLC.
- Turn the ignition OFF, wait 10-12
seconds, then turn back ON to
reset the computer.
- Press POWER/LINK
.
6. If the Scan Tool was able to link to the
vehicle successfully, the Scan Tool
displays the retrieved DTCs.
The Scan Tool will display a code only of codes are present in
the vehicle's computer memory. If no codes are present, a "No
DTC's are presently stored in the vehicle's computer" message
is displayed.
7. If more than one code was retrieved, press DTC/FF, 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.
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 Scan Tool from the vehicle and turn the ignition key
OFF.
9. To prolong battery life, the Scan Tool automatically shuts "Off" after
approximately three minutes with no button activity. The DTCs
retrieved will remain in the Scan Tool's memory, and may be viewed
at any time. If the Scan Tool’s batteries are removed, or if the Scan
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 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 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.
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