Normal Operation
WARNING: This page is about a different car, the 2006 Mercury Mountaineer and 2006 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Engine torque modulation is achieved by regulating fuel and spark to the cylinders. The stability assist system operates using the anti-lock brake system (ABS) module to interact with the powertrain control module (PCM) to reduce engine torque if one or more wheels lose traction and begin to spin during acceleration.
Fused ignition voltage is supplied from smart junction box (SJB) fuse 18 (10A) to the stability traction control switch along circuit CBP18 (GY/OG). When the switch is pressed, the voltage is sent to the ABS module along circuit CCA15 (YE/GY). The ABS module sends a message to the instrument cluster along the CAN bus to illuminate the traction control/roll stability control indicator.