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Home >> Lincoln >> 2024 >> Navigator L Livery >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System (Abs) And Stability Control >> Diagnosis And Testing >> Anti-Lock Brake System (ABS) and Stability Control >> Pinpoint Tests >> Pinpoint Test Ar: Abs Module Communication Concern With IPC Or The SELECTABLE Drive Mode Feature Is Inoperative Or The Hill Descent Control Feature Is Inoperative >> Pinpoint Test Ar: Abs Module Communication Concern With IPC Or The SELECTABLE Drive Mode Feature Is Inoperative Or The Hill Descent Control Feature Is Inoperative

Pinpoint Test Ar: Abs Module Communication Concern With IPC Or The SELECTABLE Drive Mode Feature Is Inoperative Or The Hill Descent Control Feature Is Inoperative

  1. Normal Operation and Fault Conditions 

    With the ignition ON, the IPC sends messages to the GWM over the HS-CAN3. The GWM relays these 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 IPC 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 IPC, REFER to: Anti-Lock Brake System (ABS) and Stability Control .

    On vehicles equipped with the features, the selectable drive mode and hill descent control are both enabled using the message center and IPC. When a feature is enabled, the IPC sends a message to the GWM over the HS-CAN3. The GWM GWM relays this message to several modules including the ABS module over the FD-CAN. Once the ABS module receives this message, it adjusts the ABS and stability control operating parameters to match the selected feature.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS U0155:00 Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information This DTC sets when the ABS module does not receive any messages from the IPC within the allowed time.
    ABS U0423:00 Invalid Data Received from Instrument Panel Cluster Control Module: No Sub Type Information This DTC sets when the ABS module receives messages from the IPC, but the messages contain invalid data.

    Possible Causes 

    • Network communication concern
    • GWM
    • IPC

  2. AR1 CHECK THE COMMUNICATION TO THE IPC (INSTRUMENT PANEL CLUSTER)

    • Ignition ON.

    • Using a diagnostic scan tool, retrieve the DTC s from the vehicle.
      NOTE: DTC s may be displayed from previous diagnostic actions.

    • Using a diagnostic scan tool, perform a network test.

    Does the IPC pass the network test? 

    Yes  Diagnose the IPC DTCs. REFER to: Instrumentation, Message Center and Warning Chimes . If there are no IPC DTCs, GO to  AR3
    No  GO to  AR2

  3. AR2 CHECK THE GWM (GATEWAY MODULE A) COMMUNICATION

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the network test.

    • Using a diagnostic scan tool, retrieve the DTC s from the vehicle.
      NOTE: DTC s may be displayed from previous diagnostic actions.

    Does the GWM pass the network test? 

    Yes  DIAGNOSE the IPC 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 .

  4. AR3 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTC (DIAGNOSTIC TROUBLE CODE) S

    • Using a diagnostic scan tool, carry out the ABS self-test.

    • RECORD all ABS module DTC s.

    • Using a diagnostic scan tool, clear the ABS DTCs.

    • Disconnect the diagnostic scan tool, exit the vehicle, close all doors and wait 10 minutes for all modules to completely shut down.

    • Ignition ON.

    • Carry out the ABS self-test.

    Are any of the DTC s listed in the Fault Trigger Conditions Table retrieved again? 

    Yes  GO to  AR4
    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.

  5. AR4 CHECK FOR VOLTAGE DTC (DIAGNOSTIC TROUBLE CODE) S IN THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE

    • Review the recorded DTC s from the ABS module self-test.

    Is DTC U3003:16 or U3003:17 present? 

    Yes  For DTC U3003:16, GO to Pinpoint Test A  FOR DTC U3003:17, GO to Pinpoint Test F 
    No  GO to  AR5

  6. AR5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) S IN THE GWM (GATEWAY MODULE A)

    • Using a diagnostic scan tool, carry out the GWM self-test.

    • RECORD all DTC s from the GWM self-test.

    Are any DTC s present in the GWM? 

    Yes  DIAGNOSE the GWM DTC. REFER to: Controller Area Network (CAN) Module Communications Network .
    No  GO to  AR6

  7. AR6 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) S IN THE IPC (INSTRUMENT PANEL CLUSTER)

    • Using a diagnostic scan tool, carry out the IPC self-test.

    Are any DTC s present in the IPC? 

    Yes  DIAGNOSE the IPC DTC. REFER to: Instrument Panel and Interior Switches Illumination .
    No  GO to  AR7

  8. AR7 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 IPC or the 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 a new replacement module.

    • Operate the system and determine if the observable symptom is still present.

    Is the observable symptom still present? 

    Yes  GO to  AR8
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  9. AR8 CHECK FOR COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) S IN OTHER MODULES

    • Ignition ON.

    • Using a diagnostic scan tool, retrieve the DTC s from the vehicle.
      NOTE: DTC s may be displayed from previous diagnostic actions.

    Is DTC U0155:xx, U0423:xx set in 1 or more modules in addition to the ABS module? 

    Yes  GO to  AR9
    No  GO to  AR10

  10. AR9 CHECK FOR CORRECT IPC (INSTRUMENT PANEL CLUSTER) MODULE OPERATION

    • Ignition OFF.

    • Disconnect the diagnostic scan tool, exit the vehicle, close all doors and wait 10 minutes for all modules to completely shut down.

    • Disconnect GWM C2341A.

    • 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 IPC C220A. Make sure the connector seats and latches correctly.

    • Connect IPC C220B. Make sure the connector seats and latches correctly.

    • Connect GWM C2341A. Make sure the connector seats and latches correctly.

    • Connect ABS module C135. Make sure the connector 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 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 exist for this concern, INSTALL a new IPC. REFER to: Instrument Panel Cluster (IPC) .
    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.

  11. AR10 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.

    • Ignition OFF.

    • Disconnect ABS module C135.

    • Disconnect GWM C2341A.

    • 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 the connector seats and latches correctly.

    • Connect IPC C220A. Make sure the connectors seat and latch correctly.

    • Connect IPC C220B. Make sure the connectors seat and latch correctly.

    • Connect GWM C2341A. Make sure the connectors seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  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 EBB. 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.
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