Pinpoint Test AU: Abs Module Communication Concern With AWD Module

Normal Operation and Fault Conditions

The AWD module may also be known as the TCCM.

With the ignition ON, the AWD module sends messages to the ABS module over the FD-CAN. If the ABS module does not receive these messages within the allotted time frame or if the messages contain invalid data, the module sets a DTC. This can be due to a AWD module failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the AWD module, REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
ABS U0102:00	Lost Communication with Transfer Case Control Module: No Sub Type Information	Sets if the AWD module messages are missing.
ABS U0403:00	Invalid Data Received From Transfer Case Control Module: No Sub Type Information	Sets if the information in one or more messages from the AWD module contain invalid or out of range information.

Possible Causes

Network communication concern
AWD module

AU1 CHECK THE TCCM (TRANSFER CASE CONTROL MODULE) COMMUNICATION NETWORK

NOTE: The TCCM may also be known as the AWD module or the 4WD module.

Ignition ON.

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

Does the TCCM pass the Network Test?

Yes

DIAGNOSE the TCCM Diagnostic Trouble Codes (DTCs). REFER to: DTC Chart and Pinpoint Tests - Vehicles With: 1-Speed Torque On Demand Transfer Case . REFER to: DTC Chart and Pinpoint Tests - Vehicles With: 2-Speed Torque On Demand Transfer Case . If there are no TCCM Diagnostic Trouble Codes (DTCs), GO to AU3

GO to AU2

AU2 CHECK THE GATEWAY MODULE (GWM) COMMUNICATION NETWORK

Ignition ON.

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

Does the GWM pass the Network Test?

Yes	DIAGNOSE the TCCM control module does not communicate with the diagnostic scan tool. REFER to: Controller Area Network (CAN) Module Communications Network .

No	DIAGNOSE the GWM does not communicate with the diagnostic scan tool, REFER to: Controller Area Network (CAN) Module Communications Network .

AU3 CHECK FOR RETURNING ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, clear the ABS module Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

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

GO to AU4

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

AU4 CHECK FOR VOLTAGE-RELATED DIAGNOSTIC TROUBLE CODES (DTCS) IN THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE
- Review the recorded Diagnostic Trouble Codes (DTCs) from the ABS module.
Is DTC U3003:16 or U3003:17 present in the ABS module?

Yes For ABS module DTC U3003:16, GO to Pinpoint Test A For ABS module DTC U3003:17, GO to Pinpoint Test F

No GO to AU5

AU5 RETRIEVE ALL GATEWAY MODULE (GWM) DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, carry out the GWM module self-test.
Are any GWM Diagnostic Trouble Codes (DTCs) present?

Yes DIAGNOSE the GWM Diagnostic Trouble Codes (DTCs). REFER to: Controller Area Network (CAN) Module Communications Network .

No GO to AU6

AU6 RETRIEVE ALL AWD (ALL-WHEEL DRIVE) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition ON.

Using a diagnostic scan tool, carry out the AWD module self-test.

Are any AWD module Diagnostic Trouble Codes (DTCs) present?

Yes	DIAGNOSE the AWD module Diagnostic Trouble Codes (DTCs). REFER to: DTC Chart and Pinpoint Tests - Vehicles With: 1-Speed Torque On Demand Transfer Case . REFER to: DTC Chart and Pinpoint Tests - Vehicles With: 2-Speed Torque On Demand Transfer Case .

GO to AU7

AU7 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 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 observable symptom is still present.

Is the observable symptom still present?

Yes

GO to AU8

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

AU8 CHECK FOR COMMUNICATION DIAGNOSTIC TROUBLE CODES (DTCS) IN OTHER MODULES
- Ignition ON.
- Using a diagnostic scan tool, clear the ABS module Diagnostic Trouble Codes (DTCs).
- Using a diagnostic scan tool retrieve all Diagnostic Trouble Codes (DTCs).
Is DTC U0102:xx or U0403:xx present in one or more modules in addition to the ABS module?

Yes GO to AU9

No GO to AU10

AU9 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 concern still present?

Yes	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) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. Refer to Connector Repair Procedures for schematic and connector information.

AU10 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
- Pushed-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

The HCU and ABS module are a single assembly known as the EBB unit. CHECK OASIS for any 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 EBB module. REFER to: Electric Brake Booster (EBB) .

No	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. Refer to Connector Repair Procedures for schematic and connector information.