Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Oldsmobile >> 1995 >> Silhouette >> Repair and Diagnosis >> Brakes >> Anti-Lock Brake System & Traction Control >> TCS Diagnostic Charts >> Code 124 - EBTCM-To-Pcm Requested Torque Circuit Malfunction >> Circuit And Code Description

Circuit And Code Description

The Traction Control System (TCS) uses the ABS in conjunction with PCM fuel and ignition controls to limit drive wheel slippage during acceleration. The PCM controlled portion of the TCS reduces engine torque by altering spark timing, alternating air/fuel ratio, and/or shutting off up to three injectors. EBTCM sends a spark retard request to PCM via the Pulse Width Modulated (PWM) signal requesting the desired spark level for proper traction control system operation. The PCM then provides a throttle position PWM signal informing EBTCM what the actual throttle position of engine is.

Code 124 sets when there is a malfunction in the requested torque circuit or if signal is out of range. TCS is disabled at the end of current TCS cycle and TCS warning light is illuminated.

NOTE: The numbered lines below reveal the strategy for each of the corresponding test steps. Use only 10-megohm (minimum) DVOM for all voltage and resistance tests.
scientia non olet · About Mike's Workshop Manuals