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

Electrical Diagrams




Engine Controls Schematics

Module Power, Ground, Serial Data and MIL






5V1, 5V2, and Low Reference Bus






Engine Data Sensors- Pressure and Temperature Controls






Engine Data Sensors- Heated Oxygen Sensors (1 of 2)






Engine Data Sensors- Heated Oxygen Sensors (2 of 2)






Engine Data Sensors- Throttle Controls






Ignition Controls- Ignition System Coils 1, 3, 5, and 7






Ignition Controls- Ignition System Coils 2, 4, 6, and 8






Ignition Controls- CKP, CMP and Knock Sensors






Fuel Controls- Fuel Pump Controls (LMF)






Fuel Controls- Fuel Pump Controls (L20 or L96)






Fuel Controls- Compressed Natural Gas (LC8 with FHZ)






Fuel Controls - LPG Fuel Controls (KO7 with UFM)






Fuel Controls - LPG EVAP System (KO7 with UFM)






Fuel Controls - Liquified Propane Gas (KO7 with UFP) 1 of 2






Fuel Controls- Liquified Propane Gas (KO7 with UFP) 2 of 2






Fuel Controls- Fuel Injectors






Fuel Controls- Fuel Injectors (LC8 with FHZ)






Fuel Controls- EVAP Controls






Controlled/Monitored Subsystem References