Normal Operation

The ABS module needs to be calibrated whenever a component specific to the Electronic Stability Control (ESC) or Roll Stability Control (RSC®) system is disconnected or a new component is installed. Calibration allows the ABS module to identify the "zero position" of the sensors so the system operates correctly.

• DTC C1991 (Module Calibration Failure) - If the IVD Initialization sequence does not finish or if the ABS module loses the calibration information, DTC C1991 sets.

This pinpoint test is intended to diagnose the following: 

• ABS module
• Restraints Control Module (RCM)
• Steering wheel rotation sensor