Traction Control

Traction Control Torque Circuit:

Purpose
While monitoring wheel speeds to detect slippage, the Electronic Brake and Traction Control Module (EBTCM) varies the Pulse Width Modulation (PWM) signal to the PCM.

The PCM in turn sends a PWM signal to the EBTCM in response to changes required.

Operation:

Traction Control Desired Torque (CKT 463)
The PCM monitors the PWM signal and reduces drive wheel slippage as needed by retarding ignition timing, decreasing boost duty cycle, increasing air/fuel ratio, or in severe cases, shutting "OFF" up to three fuel injectors. A problem on CKT 463 should cause DTC P1571 and ABS/TCS DTC 75 to set and traction control to be disabled.

Traction Control Delivered Torque (CKT 464)
The PCM sends a PWM signal to the EBTCM in response to the desired torque signal sent by the EBTCM. A problem on CKT 464 should cause ABS/TCS DTC 77 to set and traction control to be disabled.

PCM to EBTCM Serial Data (CKT 800)
Under certain conditions, the PCM has the ability to request the EBTCM to shut "OFF" traction control via serial data. The following DTC's will cause traction control to be disabled, ABS/TCS DTC 75 to be set, and the "Traction OFF" lamp to be illuminated:

^ P0101 - Mass Air Flow (MAF) sensor
^ P0131 - Heated Oxygen Sensor low signal voltage
^ P0132 - Heated Oxygen Sensor high signal voltage
^ P0171 - Fuel Trim Lean
^ P0172 - Fuel Trim Rich
^ P0341 - Cam/Crank Error
^ P0342 - Cam Signal Circuit
^ P1350 - Ignition Control (IC) circuit open
^ P1361 - Ignition Control (IC) circuit signal not toggling
^ P1571 - Traction Control Desired Torque Out of Range
^ P1623 - PROM error
^ P1630 - System Voltage high or low