Possible Causes

Tire pressure
Wheel and tire size
Chassis damage
Steering damage or alignment
Wheel speed sensor
Steering angle sensor
PSCM
RCM

Fig 1: Antilock Braking System (ABS) Module Connector - C135

Courtesy of FORD MOTOR COMPANY

Harness Side

Fig 2: Restraint Control Module-A (RCM-A) Connector - C310A

Courtesy of FORD MOTOR COMPANY

Harness Side

Fig 3: Restraint Control Module-B (RCM-B) Connector - C310B

Courtesy of FORD MOTOR COMPANY

Harness Side

AD1: CHECK FOR OTHER ABS MODULE DTCS

Ignition ON, engine OFF.
Carry out the ABS self-test.

Is DTC C006B:00 the only DTC present?

Yes	No
Go to AD2.	DIAGNOSE all other ABS module DTCs before diagnosing DTC C006B:00. REFER to the ABS - Antilock braking system .

AD2: CHECK THE TIRE PRESSURE

Verify all tire inflation pressures are correct as indicated on the VC label.

Are the tires inflated to the correct pressure as indicated on the VC label?

Yes	No
Go to AD3.	ADJUST the tire pressure as necessary.

AD3: VERIFY THE WHEEL AND TIRE SIZE

Verify all the tires and wheels are the same size and the size is correct as indicated on the VC label.

Are all 4 wheels and tires the correct size as indicated on the VC label?

Yes	No
Go to AD4.	INSTALL new wheels or tires as necessary.

AD4: CHECK SUSPENSION AND STEERING ALIGNMENT

Verify the suspension and steering alignment is correct. Refer to SUSPENSION SYSTEM - GENERAL INFORMATION .

Is the suspension and steering alignment correct?

Yes	No
Go to AD6.	CORRECT the suspension or steering alignment. REFER to SUSPENSION SYSTEM - GENERAL INFORMATION .

AD5: CHECK THE ABS MODULE YAW RATE PID

NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.

Access the ABS and monitor the YAW_RATE (ANGV) PID.

Is the PID value between -0.05 and 0.05?

Yes	No
Go to AD7.	Go to AD11.

AD6: CHECK THE ABS MODULE YAW RATE PID

NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.

Access the ABS and monitor the YAW_RATE (ANGV) PID.

Is the PID value between -0.05 and 0.05?

Yes	No
Go to AD7.	Go to AD11.

AD7: CHECK THE ABS MODULE LATERAL ACCELEROMETER PID

NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.

Access the ABS and monitor the LAT_ACCL (ACC) PID.

Is the PID value between -0.4 and 0.4?

Yes	No
Go to AD8.	Go to AD11.

AD8: CHECK THE ABS MODULE LONGITUDINAL ACCELEROMETER SENSOR INPUT PID

Access the ABS and monitor the LONG_ACCL (ACC) PID.

Is the PID value between -0.4 and 0.4?

Yes	No
Go to AD9.	Go to AD11.

AD9: CHECK THE ABS MODULE ROLL RATE PID

Access the ABS and monitor the ROLL_RATE (ANGV) PID.

Is the PID value between -0.4 and 0.4?

Yes	No
Go to AD10.	Go to AD11.

AD10: CHECK THE ABS MODULE STEERING WHEEL ANGLE SENSOR PID

Access the ABS and monitor the STEER_ANGL (ANGL) PID.
Slowly rotate the steering wheel one complete revolution to the left and then one complete revolution to the right.

Does the PID change in intervals of 4.5 degrees and show a 360-degree increase for each complete revolution of the steering wheel?

Yes	No
Go to AD11.	Go to PINPOINT TEST AJ .

AD11: CHECK THE RCM INSTALLATION AND MOUNTING SURFACE

WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.
Wait one minute.
RCM_A connector disconnected. (C310A)
RCM_B connector disconnected. (C310B)
Inspect the RCM installation and verify all fasteners are tighten to specifications.
Inspect the RCM mounting surface for damage, corrosion, dirt and other irregularities.

Is the RCM installed correctly and the mounting surface clean and free from damage?

Yes	No
Go to AD12.	CLEAR or REPAIR the RCM mounting surface as necessary. TIGHTEN the fasteners to the correct toque specification.

AD12: VERIFY ALL WIRING CONNECTIONS

Ignition OFF.
NOTE: The battery must be removed to access the ABS module electrical connector.
Remove the battery. Refer to the BATTERY .
ABS Module connector disconnected. (C135)
Using a good light source, inspect all disconnected electrical connectors for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary

Are the connectors free of corrosion, damaged pins, bent pins, pushed-out pins and spread terminals?

Yes	No
Go to AD13.	REPAIR the connector or terminals. Refer to OEM CONNECTOR REPAIR PROCEDURES , for schematic and connector information.

AD13: CHECK FOR CORRECT RCM OPERATION

RCM_A connector connected. (C310A) Make sure the connector seats and latches correctly.
RCM_B connector connected. (C310B) Make sure the connector seats and latches correctly.
ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
Install the battery. Refer to the BATTERY .
Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new RCM. CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues. If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.