DTC C1233, C1234, C1235, C1236[AJ (3.0L Duratec)]

STEP	INSPECTION	ACTION
1	INSPECT FOR DTC • Turn the ignition switch off. • Connect the M-MDS. • Turn the ignition switch to the ON position. • Verify if any DTCs are displayed. • Is DTC C1145, C1155, C1165, or C1175 displayed?	Yes	• Go to the DTC C1145, C1155, C1165, or C1175 diagnostic procedure. (See DTC C1145, C1155, C1165, C1175[AJ (3.0L Duratec)].)
No	• Go to the next step.
2	INSPECT ABS WHEEL-SPEED SENSOR PID • Turn the ignition switch to the ON position. • Monitor the ABS wheel-speed sensor PIDs LF_WSPD, RF_WSPD, LR _WSPD and RR _WSPD while driving the vehicle at a constant speed. • Are the ABS wheel-speed sensor PIDs displayed?	Yes	• Clear the DTC from the memory. Drive the vehicle. Read DTCs again. If DTC C1233, C1234, C1235, or C1236 is displayed, replace the ABS CM. (See ABS CM REMOVAL/INSTALLATION.)
No	• Go to the next step.
3	INSPECT ABS WHEEL-SPEED SENSOR FOR DAMAGE AND LOOSENESS • Turn the ignition switch off. • Lift up the vehicle. • Inspect the ABS wheel-speed sensor mounting for looseness. If the ABS wheel-speed sensor is suspected, inspect the sensor for corrosion on the rear axle housing boss. Clean if necessary. Caution • Inspect the ABS wheel-speed sensor wiring harness carefully in a well-lit area. Failure to verify damage in the ABS wheel-speed sensor wiring harness can lead to unnecessary replacement of the component parts. • Is the ABS wheel-speed sensor normal?	Yes	• Go to the next step.
No	• If the ABS wheel-speed sensor mounting is loose or corroded, remove the ABS-wheel-speed sensor, plug the opening, and thoroughly clean the mounting surfaces. Apply High Temperature 4x4 Front Axle and Wheel Bearing Grease E8TZ-19590-A or equivalent meeting the specification ESA-M1C198-A to the ABS wheel-speed sensor. • If the ABS wheel-speed sensor is damaged, replace the ABS wheel-speed sensor and repeat the self-test. (See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.) (See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)
4	INSPECT ABS SENSOR ROTOR • Remove the ABS wheel-speed sensor. • Inspect the ABS wheel-speed sensor for damage or missing teeth. Rotate the wheel to verify that no teeth are missing. Caution • Inspect the ABS wheel-speed sensor rotor carefully in a well-lit area. Failure to verify damage in the ABS wheel-speed sensor rotor can lead to unnecessary replacement of the component parts. • Is the ABS sensor rotor normal?	Yes	• Go to the next step.
No	• Replace the ABS sensor rotor. Clear the DTC from the memory and repeat the self-test.

STEP

INSPECTION

ACTION

INSPECT FOR DTC

• Turn the ignition switch off.

• Connect the M-MDS.

• Turn the ignition switch to the ON position.

• Verify if any DTCs are displayed.

• Is DTC C1145, C1155, C1165, or C1175 displayed?

Yes

• Go to the DTC C1145, C1155, C1165, or C1175 diagnostic procedure.

(See DTC C1145, C1155, C1165, C1175[AJ (3.0L Duratec)].)

• Go to the next step.

INSPECT ABS WHEEL-SPEED SENSOR PID

• Turn the ignition switch to the ON position.

• Monitor the ABS wheel-speed sensor PIDs LF_WSPD, RF_WSPD, LR _WSPD and RR _WSPD while driving the vehicle at a constant speed.

• Are the ABS wheel-speed sensor PIDs displayed?

Yes

• Clear the DTC from the memory. Drive the vehicle. Read DTCs again. If DTC C1233, C1234, C1235, or C1236 is displayed, replace the ABS CM.

(See ABS CM REMOVAL/INSTALLATION.)

• Go to the next step.

INSPECT ABS WHEEL-SPEED SENSOR FOR DAMAGE AND LOOSENESS

• Turn the ignition switch off.

• Lift up the vehicle.

• Inspect the ABS wheel-speed sensor mounting for looseness. If the ABS wheel-speed sensor is suspected, inspect the sensor for corrosion on the rear axle housing boss. Clean if necessary.

Caution

• Inspect the ABS wheel-speed sensor wiring harness carefully in a well-lit area. Failure to verify damage in the ABS wheel-speed sensor wiring harness can lead to unnecessary replacement of the component parts.

• Is the ABS wheel-speed sensor normal?

Yes

• Go to the next step.

• If the ABS wheel-speed sensor mounting is loose or corroded, remove the ABS-wheel-speed sensor, plug the opening, and thoroughly clean the mounting surfaces. Apply High Temperature 4x4 Front Axle and Wheel Bearing Grease E8TZ-19590-A or equivalent meeting the specification ESA-M1C198-A to the ABS wheel-speed sensor.

• If the ABS wheel-speed sensor is damaged, replace the ABS wheel-speed sensor and repeat the self-test.

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

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

INSPECT ABS SENSOR ROTOR

• Remove the ABS wheel-speed sensor.

• Inspect the ABS wheel-speed sensor for damage or missing teeth. Rotate the wheel to verify that no teeth are missing.

Caution

• Inspect the ABS wheel-speed sensor rotor carefully in a well-lit area. Failure to verify damage in the ABS wheel-speed sensor rotor can lead to unnecessary replacement of the component parts.

• Is the ABS sensor rotor normal?

Yes

• Go to the next step.

• Replace the ABS sensor rotor. Clear the DTC from the memory and repeat the self-test.