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

Fuel Injector

Fuel Injector
Signal Voltage (ECM)
Engine Off (Ignition Sw. On)
Injectors 1 - 4 10 - 13 Volts

Eninge On (Idling)
Injectors 1 - 4 1 - 14 Volts

Note: Waveform

Injector Resistance
Range between terminals of each 5 - 20 Ohms