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5
Using the
Code Scanner
®
Turn the ignition key to the KOEO or KOER. Select Read
Codes and press ENTER.
If there are no codes stored in vehicle memory, a System
Pass message displays.
If codes have been stored in vehicle memory, then the num-
ber of codes and type display (i.e. = 1 of 3 ;). Press the
DOWN arrow to view the codes. The definitions for Global
(Generic) DTCs display with the code number. Manufac-
turer-specific DTCs display the code number, and a message identifying the system
and to refer to a service manual.
Press the BACK key when done.
NOTE: Changing any part without first isolating the circuit or system may result in the
replacement of good components.
Erase Codes
The Erase Codes function deletes the DTCs from the vehicles memory. Perform this
function only after the systems have been checked completely and DTCs have been
documented. This function should be performed with KOEO - Do not START engine. An
error message will usually display when performing this function with KOER.
After servicing the vehicle, delete the stored DTCs and verify no codes have been reset.
If DTCs return, the problem has not been corrected or other faults are present.
The Erase function also erases freeze frame data, O2 sensor test data, system moni-
tors, and on-board monitoring test results, which may be accessed by other Scan Tool
type equipment.
Select Erase Codes and press ENTER. Press YES to erase the codes or NO to retain the
codes. If NO is chosen, a Erase Command Cancelled message appears.
Once YES is selected, the function cannot be interrupted. Make sure to choose YES only
if codes are to be erased permanently. A message displays stating that No Codes
Remain or the number of DTCs that remain in memory.
If DTCs still exist, the number will be displayed. The faults must be repaired to remove
these DTCs. Press ENTER to return to the Main Menu. Press the BACK key when done.
MIL Status
The MIL (Malfunction Indicator Lamp) Status function displays the state of the computer
module that commanded the MIL to turn on. A request is sent to the computer module(s)
to state whether they are commanding the MIL to turn ON. If the MIL Status is ON and the
MIL is not illuminated with the engine running, then a problem exists in the MIL circuit.
Refer to Diagnostic Circuit Check in the service repair manual.
NOTE: Some manufacturers will turn the MIL Off if a certain number of drive cycles
occur without the same fault being detected. The DTCs related to a MIL are erased
from the computers memory after 40 warm-up cycles if the same fault is not detected.
Select the MIL Status function and press the ENTER key. The MIL Status displays on the
top line and a scrolling message on the bottom indicating if the MIL lamp should be ON
or OFF. When done, press the BACK key.
I/M Monitors
The I/M (Inspection and Maintenance) Monitors function displays the state of the vehicles
OBD II Monitors. Monitors test the operation of emission related systems or compo-
nents and detect out-of-range values. The vehicle may have to be operated under cer-
tain driving conditions to initiate a monitor.
Currently, there are eleven OBD II Monitors defined and required by the U.S. Environ-
mental Protection Agency (EPA), but not all monitors are supported by all vehicles.