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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With Vehicle Control Module (VCM-A)

Servicing VCM-A:






Refer to Image for removal and installation of the Knock Sensor (KS) Calibration Programmable Read Only Memory (PROM).

CAUTION: To prevent internal Vehicle Control Module (VCM-A) damage, the ignition must be "OFF" when disconnecting or reconnecting power to the VCM-A (for example, battery cable, Engine Control Module (ECM) fuse, jumper cables, etc.).

CAUTION: To prevent possible Electrostatic Discharge damage to the VCM-A, Do Not touch the connector pins or soldered components on the circuit board.