Possible Causes

Wiring, terminals or connectors
Network communication concern
ABS module

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

Courtesy of FORD MOTOR COMPANY

Harness Side

Fig 2: Steering Angle Sensor Module (SASM) Connector - C2414

Courtesy of FORD MOTOR CO.

Harness Side

AX1: CHECK THE COMMUNICATION NETWORK

Ignition ON, engine OFF.
Press the Read Vehicle Information button to view the results of the modules communicating on the network.
Retrieve the continuous memory DTCs.

Does the ABS module pass the Network Test?

Yes	No
Go to AX2.	DIAGNOSE the scan tool does not communicate with the ABS module. REFER to COMMUNICATIONS NETWORK .

AX2: RECHECK THE SASM FOR THE LOST COMMUNICATION DTC

Clear the SASM DTCs.
Ignition OFF.
Ignition ON, engine OFF.
Carry out the SASM self-test.

Is DTC U0121:xx still present?

Yes	No
Go to AX3.	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

AX3: REVIEW THE SASM SELF-TEST FOR VOLTAGE-REALTED DTCS

Review the results from the SASM self-test.

Is DTC U3003:1C or U3003:17 present?

Yes	No
For DTC U3003:1C, Go to PINPOINT TEST BD . For DTC U3003:17, Go to PINPOINT TEST BE . For all others, No fault found.	Go to AX4.

AX4: CHECK FOR ABS MODULE DTCS

Carry out the ABS self-test.

Are any DTCs present?

Yes	No
DIAGNOSE the ABS module DTC. REFER to ABS - Antilock braking system .	Go to AX5.

AX5: CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

Check the vehicle service history for recent service actions related to the ABS module or SASM. If recent service history is found:
- Verify the correct replacement module was installed. HVBOM may be used to verify correct part fitment.
- Verify the configuration of replacement module was correct. Re-configure the module using as-built data if prior configuration is suspect.
- Verify the module was not obtained from a like vehicle and installed into customer vehicle. Return the swapped module to source vehicle and obtain new replacement module.
Operate the system and determine if the observable symptom is still present.

Is the observable symptom still present?

Yes	No
Go to AX6.	The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

AX6: CHECK FOR COMMUNICATION DTCS IN OTHER MODULES

Ignition ON, engine OFF.
Retrieve the continuous memory DTCs.

Is DTC U0121:xx set in 1 or more modules in addition to the SASM?

Yes	No
Go to AX7.	Go to AX8.

AX7: VERIFY ABS MODULE OPERATION

Ignition OFF.
ABS Module connector disconnected. (C135)
SASM connector disconnected. (C2414)
Disconnect all in-line electrical connectors between the ABS module and the SASM.
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
Connect all in-line electrical connectors between the ABS module and the SASM. Make sure the connectors seat and latch correctly.
SASM connector connected. (C2414) Make sure the connector seats and latches correctly.
ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new ABS module. CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . ORDER a replacement ABS module and INCLUDE the RVC on the form. If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.	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.

AX8: VERIFY SASM OPERATION

Ignition OFF.
SASM connector disconnected. (C2414)
ABS Module connector disconnected. (C135)
Disconnect all in-line electrical connectors between the SASM and the ABS module.
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
Connect all in-line electrical connectors between the SASM and the ABS module. Make sure the connectors seat and latch correctly.
ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
SASM connector connected. (C2414) Make sure the connector seats and latches correctly.
Operate the system and verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new SASM. CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new SASM-clockspring assembly. REFER to CLOCKSPRING or CLOCKSPRING - VEHICLES WITH: ADAPTIVE STEERING .	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.