Download Manual (pdf) - Equus

GM OBD1 Systems
CODE RETRIEVAL PROCEDURE
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 and
buttons, as necessary, 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 Tool from the vehicle and turn the ignition key OFF.
9. To prolong battery life, the Tool automatically shuts "Off" after
approximately three minutes with no button activity. The DTCs
retrieved will remain in the Tool's memory, and may be viewed at
any time. If the Tool’s batteries are removed, or if the Tool is relinked
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
(see SERVICING DTCs - OBD I on page 97) 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.
The green, yellow and red LEDs are used (with the LCD
display) as visual aids to make it easier to determine engine
system conditions. See SERVICING DTCs - OBD I on page 97
for information on interpreting LEDs and servicing DTCs.
88 OBD2&1