Equus 3140 - Scan Tool CanOBD2&1 Kit - Manual (Page 94)

92 CanOBD2&1
E
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 mean-
ings:
■ 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.
7. Disconnect the CanOBD2&1 Scan Tool from the vehicle and turn
the ignition key OFF.
8. To prolong battery life, the CanOBD2&1 Scan Tool automatically
shuts "Off" after approximately three minutes with no button activi-
ty. The DTCs retrieved will remain in the CanOBD2&1 Scan Tool's
memory, and may be viewed at any time. If the CanOBD2&1 Scan
Tool’s batteries are removed, or if the CanOBD2&1 Scan Tool is re-
linked to a vehicle to retrieve codes, any prior codes in its memory
are automatically cleared.
■ See Viewing DTCs in the CanOBD2&1 Scan Tool’s Memory
on page 14 to view DTCs stored in the CanOBD2&1 Scan Tool’s
memory.
9. 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 Erasing DTC's on page 102) 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 dis-
play) as visual aids to make it easier to determine engine sys-
tem conditions. See Servicing Diagnostic Trouble Codes
on page 100 for information on interpreting LEDs and servic-
ing DTCs.