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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Fuel Pump Control Module (J538), Checking






Fuel Pump Control Module (J538), Checking

The voltage for the fuel pump is supplied via the Fuel Pump (FP) control module.

Check the FP control module in Guided Fault Finding using the vehicle diagnosis tester.