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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Tach Signal - Range Active/Inactive
This data indicates whether the
Body Function Controller (BFC) is acknowledging a tachometer signal message at the Instrument Cluster via the Serial Peripheral Interface
(SPI) serial data line. Active, is displayed if the
Body Function Controller (BFC) is measuring a tachometer signal message at the Instrument Cluster via the Serial Peripheral Interface (SPI) serial data line. Inactive, is displayed if the Body Function Controller (BFC) is not measuring a tachometer signal message at the Instrument Cluster via the Serial Peripheral Interface (SPI) serial data line. The Instrument Cluster receives a discrete tachometer signal from the
Powertrain Control Module (PCM). The Instrument Cluster calculates the engine RPM based on the tachometer input and drives the tachometer gage. The Instrument Cluster also determines if the discrete hardware tachometer input is toggling, and sets a bit in the Serial Peripheral Interface (SPI) data return line to the Body Function Controller (BFC).