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)

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Functional Test



Calibration of Essential Measuring Equipment

WARNING: FAILURE TO COMPLY MAY RESULT IN PERSONAL INJURY OR DAMAGE TO COMPONENTS.

It is of fundamental importance that certain essential equipment e.g. torque wrenches, multimeters, exhaust gas analysers, rolling roads etc., are regularly calibrated in accordance with the manufacturers instructions.

Use of Control Modules
Control modules may only be used on the vehicle to which they were originally fitted. Do not attempt to use or test a control module on any other vehicle.

Functional Test
On completion of a maintenance procedure, a thorough test should be carried out, to make sure that the relevant vehicle systems are working correctly.