LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2024 >> Expedition MAX SSV, RWD >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Anti-Lock Brake System (Abs) And Stability Control >> Diagnosis And Testing >> Anti-Lock Brake System (ABS) and Stability Control >> Pinpoint Tests >> Pinpoint Test CE: Abs Module Communication Concern With HVAC (Heating, Ventilation And Air Conditioning) Module >> Pinpoint Test CE: Abs Module Communication Concern With HVAC (Heating, Ventilation And Air Conditioning) Module
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Pinpoint Test CE: Abs Module Communication Concern With HVAC (Heating, Ventilation And Air Conditioning) Module

  1. Normal Operation and Fault Conditions 

    With the ignition ON, the HVAC control module sends messages to the GWM over the MS-CAN, 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 HVAC control 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 HVAC control 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 U0164:00 Lost Communication With HVAC Control Module 'A': No Sub Type Information This DTC sets when the ABS module does not receive any messages from the HVAC control module within the allowed time.
    ABS U0424:86 Invalid Data Received from HVAC Control Module 'A': Signal Invalid This DTC sets when the ABS module receives messages from the APIMHVAC control module, but the messages contain invalid data.

    Possible Causes 

    • Network communication concern
    • GWM
    • HVAC control module

  2. CE1 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

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

    Does the FCIM control module pass the Network Test? 

    Yes  RETRIEVE and RECORD all FCIMDTCs. REFER to: Information and Entertainment System . If there are no DTC s in the APIM, GO to  CE3
    No  GO to  CE2

  3. CE2 CHECK THE GWM (GATEWAY MODULE A) COMMUNICATION NETWORK

    • Ignition ON.

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

    Does the GWM pass the Network Test? 

    Yes  DIAGNOSE the HVAC 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 .

  4. CE3 CHECK FOR RETURNING ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTC (DIAGNOSTIC TROUBLE CODE) S

    • 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  CE4
    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. CE4 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  CE5

  6. CE5 CHECK FOR GWM (GATEWAY MODULE A) DTC (DIAGNOSTIC TROUBLE CODE) S

    • Ignition ON.

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

    Are any GWMDTC s present? 

    Yes  DIAGNOSE the GWMDTC s. REFER to: Controller Area Network (CAN) Module Communications Network .
    No  GO to  CE6

  7. CE6 RETRIEVE ALL HVAC (HEATING, VENTILATION AND AIR CONDITIONING) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the HVAC control module self-test.

    Are any HVAC control module Diagnostic Trouble Codes (DTCs) present? 

    Yes  DIAGNOSE the HVAC control module Diagnostic Trouble Codes (DTCs). REFER to: Climate Control System .
    No  GO to  CE7

  8. CE7 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 HVAC control module 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  CE8
    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. CE8 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 U0164:xx or U0424:xx present in one or more modules in addition to the ABS module? 

    Yes  GO to  CE9
    No  GO to  CE10

  10. CE9 CHECK FOR CORRECT HEATING VENTILATION AND AIR CONDITIONING (HVAC) MODULE OPERATION

    • Ignition OFF.

    • Disconnect HVAC control module C228A .

    • Disconnect GWM module C2431A .

    • 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.

    • Connect GWM module C2431A. Make sure it seats and latches correctly.

    • Connect HVAC control module C228A. 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 HVAC control module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module - Vehicles With: 12 Inch Center Display Screen . REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module - Vehicles With: 15.5 Inch Center Display Screen .
    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.

  11. CE10 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Ignition OFF.

    • Disconnect HVAC control module C228A.

    • 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.

    • Connect GWM module C2431A. Make sure it seats and latches correctly.

    • Connect HVAC control module C228A. 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.
scientia non olet · About LEMON Manuals