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Home >> Ford >> 2005 >> Freestar V6-4.2L VIN 2 >> Repair and Diagnosis >> Brakes and Traction Control >> Antilock Brakes / Traction Control Systems >> Testing and Inspection >> Pinpoint Tests >> Test M: DTC C1991 - Module Calibration Failure
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Test M: DTC C1991 - Module Calibration Failure

PINPOINT TEST M: DTC C1991 - MODULE CALIBRATION FAILURE

NOTE: The stability assist lamp flashes when a system calibration is required. Calibration is required after certain diagnostic trouble codes (DTCs) are cleared.

NOTE: Make sure the vehicle is not on a hoist and is sitting on level ground before carrying out stability assist module calibration.

Normal Operation
The stability assist system needs to be recalibrated whenever a component specific to the system is disconnected or a new component is installed.

Possible Causes
^ anti-lock brake system (ABS) module
^ sensor cluster
^ steering wheel rotation sensor

Test M1:




Tests M2-M4:




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