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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Vehicle Speed Signal Circuit

The ECM receives the Vehicle Speed data from the Anti lock Brake System (ABS) on the vehicle speed signal circuit. The vehicle speed is calculated by the ABS controller from the wheel speed sensor signals, and is sent to the ECM via the Vehicle Speed Signal circuit. If the ECM detects a problem with this circuit, the DTC P0501 - Vehicle Speed Signal Circuit will set.