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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Component Tests and General Diagnostics

1. Disconnect glow plug/injector harness connectors from the valve cover gasket.

Glow Plug Testing:





2. With the pigtail installed, measure glow plug resistance to battery negative terminal.
3. A resistance measurement of 0.1 - 6 ohms indicates a good glow plug.