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

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System Specifications


Cranking Voltage at least 10 VDC

Ignition System Voltages
terminal 15 to ground battery voltage
(terminal 5 at the diagnostic socket)
between terminal 15 and 1 0 VDC
(terminal 5 and 4 at the diagnostic socket)
between terminal 15 and 31 (on 4 pole plug on switching unit) battery voltage
between terminal 16 and 31 (on 4 pole plug on switching unit) battery voltage

Resistance of Ignition Coil
primary winding (terminal 15 to 1) 0.3 - 0.6 Ohms
secondary winding (terminal 1 to 4) 6 - 15k Ohms

Transmitter Resistance
terminal 7 to 3 500 - 700 Ohms
terminal 7 to ground at least 200k Ohms
terminal 3 to ground at least 200k Ohms

Dwell at terminal TD
at cranking speed 5 - 23°
at 1500 rpm 33 - 51°
at 5000 rpm 45 - 55°