Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Key On Engine Off (KOEO) Self-Test Procedure

KEY ON ENGINE OFF (KOEO) SELF-TEST PROCEDURE

NOTE: Make sure the A/C switch is OFF during KOEO Self-Test. If the A/C switch is ON during this test, DTC P1464 will be indicated on the NGS tester.

1. Perform the NGS tester hook-up procedure.
2. Perform the "Reading DTCs Procedure".
3. Move the cursor to KOEO ON-DEMAND SELF-TEST.




4. Press the trigger key to enter this selection.
5. Note any KOEO DTCs.
6. Press CANCEL. Perform KOER Self-Test.