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 Level Sensing
The
Powertrain Control Module (PCM) reads the fuel level sensor, filters the data, and then sends a fuel level Class 2 serial data message to the instrument cluster for display. The instrument cluster drives the fuel gauge pointer. The PCM is responsible for sending a fuel related Class 2 serial data message so that fuel level sensing is started when Ignition 0 is ON, however the fuel level is not displayed until Ignition 1 is ON. This is done in order to reduce the latency of the fuel gauge display during key-on. The
Body Control Module (BCM) looks for the low fuel indicator Class 2 serial data report from the instrument cluster and triggers a chime when the indicator is ON.