Pinpoint Test P: DTC C1998 Module Calibration Not Complete

WARNING: This page is about a different car, the 2005 Lincoln Navigator and 2005 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Stability assist lamp will flash when calibration is required. Roll stability control (RSC) calibration is required after certain DTCs are cleared.

NOTE: Make sure the vehicle is on level ground, not on a hoist, before carrying out the anti-lock brake system (ABS) module calibration.

P1 CHECK FOR DTCS
- Connect the diagnostic tool.
- Key in ON position.
- Retrieve the DTCs.
- Are any other DTCs retrieved with C1998?
- Yes : GO to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX . NOTE: Some of the pinpoint tests recommend RSC calibration prior to any further diagnostics, in this case GO to P2.
- No GO to P2.
P2 ABS CALIBRATION
- Connect the diagnostic tool.
- Start the engine.
  NOTE: Be sure to rotate the steering wheel lock-to-lock during the calibration of the ABS system.
- Carry out the ABS module calibration per the diagnostic tool instructions.
- Did the calibration complete for all of the stability assist sensors; and did the stability assist lamp stop flashing and go off?
- Yes : GO to P3.
- No : GO to P4.
Some concerns will cause the calibration not to complete. If sent here from another pinpoint test, return to that pinpoint test for further diagnostics.
P3 CLEAR DTC C1998
NOTE: You must clear DTC C1998 after the completion of the calibration.
- Connect the diagnostic tool.
- Key in ON position.
- Clear the DTC.
- Did the DTC clear?
- Yes : TEST DRIVE the vehicle. REPEAT the self-test.
  NOTE: If sent here from another pinpoint test, return to that pinpoint test for further diagnostics.
- No : GO to P4.
P4 MONITOR THE STEERING WHEEL ROTATION SENSOR PIDS
NOTE: You must clear DTC C1998 after the completion of the RSC calibration.
- Key in ON position.
- Monitor the ABS module steering position sensor PIDS while rotating the steering wheel clockwise and counterclockwise.
- Are the two steering position sensor PID values switching as the wheel rotates?
- Yes : GO to PINPOINT TEST H .
- No : GO to PINPOINT TEST G .