Filter
Top Products
GM Historic (OBD I) Diagnostics
5 – 2 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
5
One of two screens displays: If the diagnostic checks are working correctly and
no DTCs have been stored in vehicle’s memory, a SYSTEM PASS message
displays. If not, the tool displays a screen indicating the number DTCs.
Use the
arrow keys to scroll
through the codes. Note the codes and
press
to return to the GM Func-
tion List.
Erase Codes
The
Erase Codes
function deletes the DTCs from the vehicle’s computer mem-
ory. Perform this function with KOEO or KOER. This function should be per-
formed only after the systems have been checked completely and DTCs have
been documented.
After servicing the vehicle, erase the stored DTCs, perform a road test, and then
verify no new codes have been stored. If DTCs return, the problem has not been
corrected or other faults are present.
✓ Some codes can only be removed by repairing the faults that caused
them. Therefore, these codes will remain in the vehicle’s memory until the
condition is repaired.
✓ Not all trouble codes can be automatically erased using the scan tool.
Some vehicles require a manual erasing procedure. If possible, the tool
performs the appropriate
Erase Codes
procedure for your vehicle.
Select
Erase Codes
and press the
key.
A message appears asking if you are
sure. Press
to move the
brackets to the desired response and
press
.
Selecting NO and pressing
returns you to the GM Function List.
Selecting YES displays a screen
prompting you to turn ignition ON. Turn
ignition key ON. Engine can be off or
running. Press
to continue.