DTC C1222

BHE040243000W25

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

DTC

C1222

ABS wheel-speed sensor (slip monitor)

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 WDS OR EQUIVALENT

• Turn the ignition switch off.
• Connect the WDS or equivalent to the DLC-2.
• Select the following PIDs using the WDS or equivalent:
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 5.
No
If there is a difference in speeds of the four wheels, go to the next step.
2

INSPECT ABS WHEEL-SPEED SENSOR OUTPUT PULSE USING OSCILLOSCOPE

• Inspect output voltage pattern from the ABS wheel-speed sensor.
• Is the output voltage pattern normal?
Yes
Go to Step 5.
No
If there is any malfunction in the front ABS wheel-speed sensor, replace the front ABS wheel-speed sensor, then go to Step 5.
If there is any malfunction in the rear ABS wheel-speed sensor, go to the next step.
3

INSPECT IF MALFUNCTION OCCURRED DUE TO IMPROPER SENSOR CLEARANCE

• Inspect the clearance between the ABS wheel-speed sensor and the rear ABS sensor rotor.
Clearance
0.3-1.1 mm {0.012-0.043 in}
Yes
Go to the next step.
No
Replace the rear ABS wheel-speed sensor, then go to Step 5.
4

VISUALLY INSPECT REAR ABS SENSOR ROTOR FOR ABNORMAL OR MISSING TEETH, DEFORMATION, OBSTRUCTION, AND ANGLED INSTALLATION

• Is the result normal?
Yes
Go to the next step.
No
Replace the rear drive shaft, then go to the next step.
5

VERIFY DTC TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the memory.
• Are the same DTCs present?
Yes
Repeat the inspection from Step 1.
If the malfunction recurs, replace the DSC HU/CM.
No
Go to the next step.
6

VERIFY AFTER REPAIR PROCEDURE

• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC Table.)
No
DTC troubleshooting completed.