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)

Or, hide this message: temporarily or permanently

Preliminary Checks

Preliminary Checks
Before proceeding with Symptom Diagnosis, perform the "On-Board Diagnostic (OBD) System Check" and verify all of the following items:
- The powertrain control module (PCM), and malfunction indicator lamp (MIL) (Check Engine lamp) and Reduced Power Lamp (RPL) are operating correctly.
- There are no DTC(s) stored.
- Tech 2 data is within normal operating range. Refer to Typical Scan Data Values.
- Verify the customer complaint and locate the correct symptom in the table of contents. Perform the procedure included in the symptom chart.