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2008 - MX-5 - Brakes

DTC C1222 [DYNAMIC STABILITY CONTROL (DSC)]

NOTE:



DTC

C1222

ABS wheel-speed sensor (slip monitor) system

DETECTION CONDITION

  • Difference between any vehicle wheel speeds exceeds specification when driving at a constant speed.

  • ABS control operates for 60 s or more.

POSSIBLE CAUSE

  • ABS wheel-speed sensor malfunction (low output, metal shavings on sensor)

  • ABS sensor rotor malfunction (chipping of sensor rotor teeth)

  • Poor installation of ABS wheel-speed sensor and/or sensor rotor (If the sensor rotor is installed at an angle, it may cause output of abnormal wave pattern at high speeds.)

  • Excessive clearance between the ABS wheel-speed sensor and sensor rotor


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT PID FOR ABNORMAL OUTPUT FROM ABS WHEEL-SPEED SENSOR USING M-MDS
  • Turn the ignition switch off.

  • Connect the M-MDS to the DLC-2.

  • Select the following PIDs using the M-MDS:

    LF_WSPD

    LR_WSPD

    RF_WSPD

    RR_WSPD

  • Drive the vehicle.

  • Verify that the PIDs of the four ABS wheel-speed sensors correspond approximately.

  • Do the vehicle speeds correspond?

Yes

Go to Step 4.

No

If there is a difference in speeds of the four wheels, go to the next step.

2

INSPECT IF MALFUNCTION OCCURRED DUE TO IMPROPER SENSOR CLEARANCE
  • Inspect the clearance between the ABS wheel-speed sensor and the ABS sensor rotor.

    • Clearance

      Front: 0.3—1.0 mm {0.012—0.057 in}

      Rear: 0.8—1.6 mm {0.032—0.062 in}

Yes

Go to the next step.

No

Replace the rear ABS wheel-speed sensor, then go to Step 4.

(See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)

(See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)

3

VISUALLY INSPECT ABS SENSOR ROTOR FOR FOREIGN MATERIAL ADHERING OR IMPROPER INSTALLATION
  • Is the result normal?

Yes

Go to the next step.

No

Replace the front wheel hub component or rear drive shaft, then go to the next step.

(See WHEEL HUB, STEERING KNUCKLE REMOVAL/INSTALLATION.)

(See REAR DRIVE SHAFT REMOVAL/INSTALLATION.)

4

VERIFY DTC TROUBLESHOOTING COMPLETED

Yes

Repeat the inspection from Step 1.

If the malfunction recurs, replace the DSC HU/CM, then go to the next step.

(See DSC HU/CM REMOVAL/INSTALLATION.)

No

Go to the next step.

5

VERIFY AFTER REPAIR PROCEDURE
  • Are any other DTCs present?

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSIS[DYNAMIC STABILITY CONTROL (DSC)].)

No

DTC troubleshooting completed.




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