DTC C1222

id040200801500

Note
•  DTC C1222 will be detected when a malfunctioning ABS wheel-speed sensor cannot be specified.

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 or engine switch off.
•  Connect the M-MDS to the DLC-2.
•  Select the following PIDs using the M-MDS:
WSPD_LF
WSPD_LR
WSPD_RF
WSPD_RR
•  Start the engine and 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
0.30—1.1 mm {0.012—0.043 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 [4X2 (EXCEPT HIGH CLEARANCE MODEL)].)
(See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION [4x2 (HIGH CLEARANCE MODEL), 4X4].)
(See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION [4X2 (EXCEPT HIGH CLEARANCE MODEL)].)
(See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION [4x2 (HIGH CLEARANCE MODEL), 4X4].)
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, front drive shaft or rear axle shaft, then go to the next step.
(See WHEEL HUB, STEERING KNUCKLE REMOVAL/INSTALLATION [4x2 (EXCEPT HIGH CLEARANCE MODEL)].)
(See WHEEL HUB, STEERING KNUCKLE REMOVAL/INSTALLATION [4X2 (HIGH CLEARANCE MODEL)].)
(See FRONT DRIVE SHAFT REMOVAL/INSTALLATION [G6, WLT-1, WLT-2].)
(See FRONT DRIVE SHAFT REMOVAL/INSTALLATION [WL-C, WE-C].)
(See AXLE SHAFT REMOVAL/INSTALLATION.)
4
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the memory.
•  Start the engine and drive the vehicle at 12 km/h {7.5 mph} or more.
•  Are the same DTCs present?
Yes
Repeat the inspection from Step 1.
If the malfunction recurs, replace the ABS HU/CM.
(See ABS 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.)
No
DTC troubleshooting completed.