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

Testing Requirements



1. Fully charged battery (at least 12 V DC).
2. Adequate fuel quality and quantity.
3. Fuel pump, fuel pressure, and fuel injection systems in good working order.
4. Ambient temperature approximately 20°C (68°F); (significant temperature change will affect the measured values).
5. Engine in good mechanical condition (good compression, valve clearances set, etc.)
6. Starter must be in good condition.

IMPORTANT: Carefully read "PRECAUTIONS" section before working on TCI or DME systems.