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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 756 (Anti-Lock Brake System - F150 & Mark LT) >> Diagnostic Tests >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test F: The Traction Control System Cannot Be Disabled/Enabled or the Traction Control System is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The ABS module sends wheel speed sensor information to the PCM along the high-speed controller area network (HS-CAN) bus. The PCM compares the front wheel speed sensor information to the rear wheel speed sensor information to determine if traction control is necessary. If traction control is necessary, the PCM limits engine torque by regulating fuel and spark to the cylinders, to control the wheel slip. At the same time, the PCM sends the instrument cluster a message over the HS-CAN bus to flash the traction control indicator. The traction control indicator informs the driver that a traction control event is taking place.

The traction control system can be disabled by pressing the traction control switch located on the instrument panel. When the system is disabled, the traction control system indicator light on the switch will illuminate and the message center (if equipped) will display Traction Control Off.

Fused ignition voltage is supplied to the traction control switch from central junction box (CJB) fuse 15 (5A) along circuit 640 (RD/YE) and 640 (BK). When the traction control switch is pressed, the voltage is supplied through the switch to the PCM along circuit 959 (GY). The PCM then grounds circuit 960 (BK/LB) which illuminates the traction control system indicator in the switch.

This pinpoint test is intended to diagnose the following:

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