GM Historic (OBD I) Diagnostics
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5
Select Read Codes from the GM
Function List and press
ENTER
. The
tool will retrieve the DTCs.
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
UP/DOWN
arrow keys to scroll
through the codes. Note the codes and
press
FUNC
to return to the GM
Function List.
Erase Codes
The Erase Codes function deletes the DTCs from the vehicle’s computer
memory. Perform this function with KOEO or KOER. This function should be
performed 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
ENTER
key.
GM Function List ?
`1)Read Codes
2)Erase Codes
[
3)View Data
~
System Pass:
No Faults Detected.
~
Codes Found: 1
Use
Q
To View Codes
Write Down Codes
For Reference
~
Current Code P0325
Ign System Problem
Elec Spark Control
ESC Failure
~
GM Function List ?
1)Read Codes
`2)Erase Codes
[
3)View Data
~