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)

Or, hide this message: temporarily or permanently

Traction Control

Traction Control Torque Reduction Request Circuit

The Antilock Brake System controller sends a signal to the ECM indicating that an excessive wheel spin has been detected. This data is used in order to reduce the engine torque in order to reduce the wheel spin and improve the traction. If the Transmission Control Module (TCM) detects a problem on this circuit, the DTC P1844 - Traction Control Torque Reduction Request Circuit will set.