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

Signal Overview

ECM Output Signals:





^ Injectors (4 signals)
^ Engine speed
^ Ignition pulses (4 signals
^ A/C compressor
^ Main relay
^ Fuel pump relay
^ Malfunction indicator lamp (CHECK ENGINE)
^ Shift up indication
^ Data link connector (diagnostics)
^ Oxygen sensor, preheating (2 outputs)
^ Fuel consumption
^ Engine load signal (Tq)
^ Boost pressure control valve (2 outputs)
^ Canister purge valve (ELCD) (2 outputs)
^ Idle air control valve (2 outputs)