Possible Causes

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Wiring, terminals or connectors
Network communication concern
ABS
TCCM module

AU1: CHECK THE COMMUNICATION NETWORK

Ignition ON.
Using a diagnostic scan tool, carry out the Network Test.

Does the TCCM pass the network test?

Yes	No
Go to AU2.	DIAGNOSE the no communication with the TCCM . Refer to: COMMUNICATIONS NETWORK .

AU2: CHECK FOR ABS (ANTI-LOCK BRAKE SYSTEM) MODULE CM DTC (CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE)

NOTE: To access the ABS ECU Reset routine when using Ford IDS , go to Chassis, then Brakingand click ABS ECU Reset routine.

Ignition OFF.
Ignition ON.
Using a diagnostic scan tool, carry out the ABS ECU Reset routine.
Using a diagnostic scan tool, carry out the ABS module self-test.

Are any of the Diagnostic Trouble Codes (DTCs) in the DTC Fault Trigger Conditions table retrieved again?

Yes	No
Go to AU3	The system is operating correctly at this time. The DTC may have been set due tohigh network traffic or an intermittent fault condition.

AU3: REVIEW THE RECORDED DIAGNOSTIC TROUBLE CODE (DTCS) FROM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST

Review the recorded Diagnostic Trouble Codes (DTCs) from the ABS module.

Is DTC U3003:16 or U3003:17 present in the ABS module?

Yes	No
For ABS module DTC U3003:16, Pinpoint Tests A For ABS module DTC U3003:17, Pinpoint Tests F	Go to AU4.

AU4: RETRIEVE ALL TCCM (TRANSFER CASE CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE)

Ignition ON.
Using a diagnostic scan tool, carry out the TCCM self-test.

Are any TCCM DTCs present?

Yes	No
DIAGNOSE the TCCM Diagnostic Trouble Codes (DTCs). Refer to FOUR-WHEEL DRIVE SYSTEMS - RAPTOR, VEHICLES WITH: 4HI-LOC TORQUE ON DEMAND TRANSFER CASE Refer to FOUR-WHEEL DRIVE SYSTEMS - VEHICLES WITH: 2-SPEED TORQUE ON DEMAND TRANSFER CASE Refer to FOUR-WHEEL DRIVE SYSTEMS - VEHICLES WITH: ELECTRONIC SHIFT TRANSFER CASE	Go to AU5.

AU5: CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

NOTE: If new modules were installed prior to the DTC being set, the module configuration can beincorrectly 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 TCCM or ABS module. 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 obserable symptom is still present?

Is the observable symptom still present?

Yes	No
Go to AU6.	The system is operating correctly as this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

AU6: CHECK FOR COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) IN OTHER MODULES

Ignition ON.
Using a diagnostic scan tool, clear the ABS module DTC s.
Using a diagnostic scan tool retrieve all DTC s.

Is DTC U0102:xx or U0403:xx present in one or more modules in addition to the ABS module?

Yes	No
Go to AU7.	Go to AU8

AU7: CHECK FOR CORRECT TCCM (TRANSFER CASE CONTROL MODULE) MODULE OPERATION

Ignition OFF.
Disconnect TCCM C2371A
Disconnect TCCM C2371B
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 TCCM C2371A . Make sure it seats and latches correctly.
Connect TCCM C2371B . Make sure it seats and latches correctly.
Operate the system and determine if the concern is still present.

Is the observable symptom still present?

Yes	No
CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new TCCM . Refer to TRANSFER CASE CONTROL MODULE (TCCM) .	The system is operating correctly at this time. The concern may have been caused bymodule connections. ADDRESS the root cause of any connector or pin issues. Refer to CONNECTOR REPAIR PROCEDURES for schematic and connector information.

AU8: CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

Ignition OFF.
Disconnect ABS module 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
- Push-out pins - install new pins as necessary
- Spread terminals - install new terminals as necessary.
Connect ABS module C135 . Make sure it seats and latches correctly.
Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	No
CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOWthe service article instructions. If no service articles address this concern, INSTALL a new ABS module. Refer to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . INSTALL a new Anti-Lock Brake System (ABS) module.	The system is operating correctly at this time. The concern may have been caused bymodule connections. ADDRESS the root cause of any connector or pin issues. Refer to CONNECTOR REPAIR PROCEDURES for schematic and connector information.