Circuit Description

TCS uses Anti-lock Brake System (ABS) in conjunction with PCM fuel and ignition controls to limit drive wheel slippage during acceleration.

DTC will set when desired torque signal Pulse Width Modulation (PWM) is less than 5 percent or greater than 95 percent or desired torque signal is not received by PCM for 3 seconds.

PCM supplies 5 volts on Desired Torque (DT) circuit to Electronic Brake And Traction Control Module (EBTCM). EBTCM toggles this 5-volt signal to ground in order to produce a duty cycle signal. Signal is proportional to the amount of engine output torque requested by EBTCM. EBTCM supplies this signal when it detects a wheel slip.

In order to reduce engine output torque, the PCM reduces the amount of spark advance and in some cases, disables a number of fuel injectors. This diagnostic test check for DT signal failure. DTC will set when PCM does not receive the desired torque signal for 3 seconds.