EDI DIAGNOSIS
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 5E-13
Clearing Codes
IMPORTANT: To avoid improper tool functions, Ensure the battery is fully charged.
BLINK CODE TOOL
1. Connect BCT (Blink Code Tool), if not already connected.
2. Make certain the ignition key is in the OFF position.
3. Press the button on the Diagnostic Code Tool, and hold it depressed.
4. Switch the key to ON while continuing to press the Tool button for between 2.5 and 5
seconds.
5. When the button on the Tool is released the 0000 Code should be seen.
NOTE: The 0000 Code is displayed when all Trouble Codes have been read or cleared. The
Code 0000 (meaning end of diagnosis is displayed as follows: A pause in the MIL for 2.5
seconds, a flash for 2.5 seconds, pause for 2.5 seconds, flash for 2.5 seconds.) This code
sequence will repeat until a new request for diagnosis interrupts the communication be-
tween the Tool and the ECM.
6. Press the button for longer than 2.5 seconds to interrupt the diagnostic procedure.
7. Press the button again for longer than 2.5 seconds to start the ECM checking for codes.
8. See that the 4444 Code (meaning no trouble codes present) is displayed.
9. If codes are still present refer to appropriate Troubleshooting and/or Diagnostic informa-
tion.
10. Each time the Blink Code Tool (BCT) is employed, the following procedure should be
used:
a. Interrogate the ECM to check for memory errors.
b. Cancel memory errors.
c. Use the engine at least 10 minutes to ensure that any errors have been re-recorded.
d. Re-interrogate the ECM to find out which errors are really present and which of the
previous errors were casual.
11. Refer to appropriate Diagnostic Circuit Check or Troubleshooting section.
SCAN TOOL
1. Connect scan tool.
2. Turn Key On.
3. Select clear codes function.
4. Clear codes.
5. Turn key OFF.
6. Turn key ON and read codes. If codes are still present, there is a real system fault. Refer
to appropriate Troubleshooting and/or Diagnostic information.
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