LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2016 >> Explorer Sport >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System Component Testing >> Pinpoint Tests >> Pinpoint Tests BH: ABS Module Communication Concern With The RCM >> Normal Operation and Fault Conditions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Normal Operation and Fault Conditions

With the ignition ON, the RCM sends messages to the ABS module over the HS-CAN 2. If the ABS module does not receive these messages within a certain time frame, the ABS module sets DTCs. This can be due to a RCM 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 RCM, refer to the Network Message Chart in  Anti-Lock Brake System (ABS) And Stability Control  . 

PPT BH ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Conditions
U0151:00 Lost Communication With Restraints Control Module: No Sub Type Information Sets in continuous memory and on-demand when the expected RCM messages such as yaw rate sensor, lateral and longitudinal accelerometers are missing for more than 5 seconds.
U0452:41 Invalid Data Received From Restraints Control Module: General Checksum Failure Sets if the yaw rate, lateral acceleration, longitudinal acceleration or roll rate message checksum is incorrect or does not match the calculated checksum more than twice.
U0452:86 Invalid Data Received From Restraints Control Module: Signal Invalid Sets if any of the RCM signal messages (yaw rate, lateral acceleration, longitudinal acceleration and roll rate) are out of range or the signal contains invalid information.

Possible Causes 

Fig 1: Antilock Braking System (ABS) Module Connector - C135
G11681959Courtesy of FORD MOTOR CO.

Harness Side

  1. BH1: 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 RCM pass the network test? 
      Yes No
      Go to  BH2. DIAGNOSE the no communication with the RCM. REFER to Module Communications Network .
  2. BH2: RECHECK FOR THE ABS MODULE DTCS 
    • Carry out the ABS self-test.
    • Clear the ABS DTCs.
    • Ignition OFF.
    • Ignition ON, engine OFF.
    • Carry out the ABS self-test.
    • Record all ABS module DTCs.
    • Is DTC U0151:xx or U0452:xx retrieved again? 
      Yes No
      Go to  BH3. The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
  3. BH3: CHECK FOR VOLTAGE DTCS IN THE ABS MODULE 
    • Review the recorded DTCs from the ABS module self-test.
    • Is DTC U3003:16 or U3003:17 present? 
      Yes No
      For DTC U3003:17, Go to PINPOINT TEST F .
      For DTC U3003:16, Go to PINPOINT TEST A .      		 Go to  BH4.
  4. BH4: CHECK FOR DTCS IN THE RCM 
    • Carry out the RCM self-test.
    • Record all DTCs from the RCM self-test.
    • Are any DTCs present? 
      Yes No
      DIAGNOSE the RCM DTCs. REFER to the Diagnosis and Testing in Supplemental Restraint System . Go to  BH5.
  5. BH5: 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 RCM 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 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  BH6. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  6. BH6: CHECK FOR LOST COMMUNICATION DTCS SET IN OTHER MODULES 
    • Retrieve the continuous memory DTCs.
    • Is DTC U0151xx or U0452:xx set in 1 or more modules in addition to the ABS module? 
      Yes No
      Go to  BH7. Go to  BH8.
  7. BH7: CHECK FOR CORRECT RCM OPERATION 
    WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
    • Ignition OFF.
    • Wait one minute.
    • RCM_A connector disconnected.
    • RCM_B connector disconnected.
    • ABS Module connector disconnected. (C135)
    • Disconnect all in-line electrical connectors between the ABS module and the RCM.
    • 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 RCM. Make sure the connectors seat and latch correctly.
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • RCM_B connector connected. Make sure the connector seats and latches correctly.
    • RCM_A connector connected.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
      Yes No
      INSTALL a new RCM.
      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 RCM. REFER to Supplemental Restraint System .      		 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.
  8. BH8: CHECK FOR CORRECT ABS MODULE OPERATION 
    WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
    • Ignition OFF.
    • Wait one minute.
      NOTE: The battery must be removed to access the ABS module electrical connector.
    • Remove the battery. REFER to Charging System (Battery, Battery Mounting And Battery Cables) .
    • ABS Module connector disconnected. (C135)
    • RCM_A connector disconnected.
    • RCM_B connector disconnected.
    • Disconnect all in-line electrical connectors between the ABS module and the RCM.
    • 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 RCM. Make sure the connectors seat and latch correctly.
    • RCM_B connector connected. Make sure the connector seats and latches correctly.
    • RCM_A connector connected.
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Install the battery. REFER to Charging System (Battery, Battery Mounting And Battery Cables) .
    • Operate the system and determine if 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 the ABS module Removal and Installation procedure in Anti-Lock Brake System (ABS) And Stability Control .
      ORDER a replacement ABS module and INCLUDE the RVC form.
      If this is a Ford repair, INCLUDE the RVC on the warranty claim form.
      When complete, SELECT the "X" in the top right corner to CLOSE this procedure.      		 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.
scientia non olet · About LEMON Manuals