Normal Operation

The ABS module receives brake pedal input from the PCM over the High Speed Controller Area Network (HS-CAN). The ABS module compares this information against other inputs (wheel speed signals, vehicle speed signal, brake pressure transducer) to determine if the brake pedal input is valid. A brake pedal switch that is misadjusted or incorrectly installed can cause a signal plausibility concern.

• DTC C0040: 64 (Brake Pedal Switch "A": Signal Plausibility Failure) - this DTC sets if during normal operation or the on-demand self-test, the ABS module cannot detect the brake pedal input or if the brake pedal input does not match information from other sensors (wheel speed signals, vehicle speed signal, brake pressure transducer).

This pinpoint test is intended to diagnose the following: 

• Stoplamp concern
• Communication concern
• ABS module