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Pinpoint Test D: Diagnosing Radio Frequency Interference Faults

WARNING: This page is about a different car, the 2022 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. NOTE: Make sure that all aftermarket electronic equipment has been disconnected (if possible) and the customer has been questioned about the electronic equipment they may have been using in the vehicle when this concern was identified.

    Normal Operation and Fault Conditions 

    REFER to: Tire Pressure Monitoring System (TPMS) - System Operation and Component Description .

    One or more TPMS sensors not being trained or missing, RTM wiring and BCM wiring, or an internal failure of the RTM, GWM or BCM can all present symptoms similar to RFI.

    Possible Sources 

    • Wiring, terminals or connectors
    • Not all TPMS sensors are installed
    • TPMS sensor(s) not trained
    • TPMS sensor(s)
    • Intermittent TPMS operation due to RFI
    • RTM
    • GWM
    • BCM

    Visual Inspection and Pre-checks 

    • Inspect for customer electronic devices, such as a cell phone charger or GPS unit.
    • Inspect for aftermarket wheels or run-flat tires (tires with steel body cord plies in the tire sidewall).
    • Verify horn operation

  2. D1 CHECK FOR COMMUNICATION WITH THE GWM (GATEWAY MODULE A) AND THE RTM (RADIO TRANSCEIVER MODULE)

    • Ignition ON.

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

    Do the GWM and the RTM pass the Network Test? 

    Yes  GO to D2 
    No  DIAGNOSE the GWM or RTM does not respond to the scan tool. REFER to: Communications Network .

  3. D2 CHECK FOR RTM (RADIO TRANSCEIVER MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

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

    Are there any Diagnostic Trouble Codes (DTCs) present in the RTM? 

    Yes  DIAGNOSE all RTM Diagnostic Trouble Codes (DTCs). REFER to the DTC Chart: RTM .
    No  GO to D3 

  4. D3 VIEW THE BCM (BODY CONTROL MODULE) TPMS (TIRE PRESSURE MONITORING SYSTEM) STATUS (TPMS_STATUS) PID (PARAMETER IDENTIFICATION)

    • Ignition ON.

    • Using a diagnostic scan tool, view the BCM TPMS_STATUS PID.

    Does the TPMS_STATUS PID display SYSTEM FAULT? 

    Yes  GO to D4 
    No  GO to  D6

  5. D4 CARRY OUT THE TPMS (TIRE PRESSURE MONITORING SYSTEM) SENSOR TRAINING PROCEDURE

    NOTE: Before beginning TPMS sensor training, make sure the vehicle is away from other vehicles or devices which may cause RFI such as electric motors or radio transmitters.

    Did all of the TPMS sensors train and did the horn sound when each sensor was trained? 

    Yes  The system is operating correctly at this time. The concern may have been caused by RFI. For information on locating sources of RFI, REFER to: Tire Pressure Monitoring System (TPMS) - System Operation and Component Description .
    No  GO to D5 

  6. D5 ATTEMPT TO CARRY OUT THE SENSOR TRAINING PROCEDURE AGAIN USING KNOWN GOOD SENSORS

    • Move the vehicle to rotate the wheels at least one-fourth of a turn. Leave the vehicle doors open.

    Did all of the known good TPMS sensors train and did the horn sound when each known good sensor was trained? 

    Yes  If only some of the sensors trained, VERIFY the correct sensors are installed for those that fail to train. If the correct sensors are installed and do not train, INSTALL a new TPMS sensor for each sensor that failed to train. REFER to: Tire Pressure Monitoring System (TPMS) Sensor . If all the known good sensors trained, INSTALL new TPMS sensors. REFER to: Tire Pressure Monitoring System (TPMS) Sensor .
    No  INSTALL a new RTM. REFER to: Radio Transceiver Module (RTM) . If the concern is still present, GO to D6 

  7. D6 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all BCM connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins).
      • damaged or bent pins - install new terminals or pins.
      • pushed-out pins - install new pins as necessary.

    • Connect the BCM connectors. Make sure they seat and latch correctly.

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

    Is the concern still present? 

    Yes  If all the sensors are present and of the correct type, CHECK OASIS for any applicable Technical Service Bulletins (TSBs), GSB, SSM or FSA. If a exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no TSB exists for the concern, INSTALL a new BCM. REFER to: Body Control Module (BCM) . .
    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.
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