Circuit Description

The Electronic Brake and Traction Control Module (EBTCM) controls the Pulse Width Modulated (PWM) signal on the desired torque circuit while monitoring the wheel speed sensors to detect slippage. The PCM monitors the PWM signal and reduces engine torque as needed by retarding ignition timing, decreasing boost duty cycle, increasing air/fuel ratio, or in severe cases, shutting off up to 3 fuel injectors.

PCM sends a PWM signal to the EBTCM on the delivered torque circuit, informing the EBTCM of response made to the desired torque signal. A problem with the delivered torque circuit should cause DTC P1689 and ABS/TCS DTC 76 to set, and traction control disabled.

Conditions for setting this DTC are, improper voltage level has been detected on the output circuit which controls the traction control delivered torque output and condition present for at least 30 seconds.