Traction Control System

TRACTION CONTROL CIRCUITS

Traction Control Desired Torque (CKT 463)
While monitoring wheel speeds to detect slippage, the Electronic Brake and Traction Control Module (EBTCM) varies the Pulse Width Modulated (PWM) signal on 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 extreme cases, shutting "OFF" up to three fuel injectors. A problem with CKT 463 should cause DTC P1571 and Anti-Lock Brake (ABS) / Traction Control System (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 on CKT 464 informing the EBTCM of response made to the desired torque signal EBTCM. A problem with 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 (CKT 800). The following DTCs 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 (HO2S) - Low Signal Voltage
P0132 - Heated Oxygen Sensor (HO2S) - 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 Circuit
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