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TRTS0980 EN-US
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November 2023 - A

Fault Code 24: XBR System State

J1939: SA 3 SPN 2917 FMI 13, 19

Overview

The Transmission Electronic Control Unit (TECU) receives the vehicle’s eXternal Brake Request (XBR) System State message, associated to the vehicle Collision Mitigation System (CMS), over the Primary Data Link. This information is used to determine transmission operation.

Detection

The TECU monitors the XBR System State message. If a failure is detected the fault is set Active.

Conditions to Set Fault Code Active

FMI 13 - Out of Calibration: XBR System State message is not available or TECU is not properly configured for 5 seconds.

FMI 19 - Received Network Data In Error: XBR System State message invalid for 5 seconds.

Fallback

All FMIs

  • Hill Start Aid inoperative.

    Note: Refer to OEM regarding vehicle fallback modes.

Conditions to Set Fault Code Inactive

All FMIs: XBR System State received, TECU properly configured and valid for 10 seconds.

Possible Causes

FMI 13

  • TECU not properly configured
  • Vehicle Components
    • Module(s)
    • CMS

FMI 19

  • Vehicle Components
    • Module(s)
    • CMS

Fault Code 24 Troubleshooting

A
Purpose:Check for Active or Inactive fault codes.

  1. Set vehicle parking brake and chock wheels.

  2. Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure.

  • If Fault Code 24 is Inactive, and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V

  • If Fault Code 24 FMI 13 is Active, Go to Step B

  • If Fault Code 24 FMI 13 is Inactive, External Braking Integration configuration is properly configured. Go to Step V

  • If Fault Code 24 FMI 19 is Active or Inactive, refer to OEM guidelines regarding repair or replacement of the vehicle’s XBR System State associated to CMS. Go to Step V

B
Purpose:Verify External Braking Integration configuration with ServiceRanger.

  1. Key on.

  2. Connect ServiceRanger.

  3. Go to “Configurations”.

  4. Select “Vehicle”.

  5. Record External Braking Integration Current Value.

  • If vehicle is equipped with CMS and External Braking Integration Current Value indicates “Not Supported”, select “Supported” and follow on-screen prompts. Go to Step V

  • If vehicle is not equipped with CMS and External Braking Integration Current Value indicates “Supported”, select “Non Supported” and follow on-screen prompts. Go to Step V

  • If the vehicle is equipped with CMS and External Braking Integration Current Value is properly configured, refer to OEM and enable vehicle External Braking Integration SPN 2917. Go to Step V

V
Purpose:Verify repair.

  1. Key off.

  2. Reconnect all connectors and verify that all components are properly installed.

  3. Key on with engine off.

  4. Clear fault codes using ServiceRanger.

  5. Drive vehicle and attempt to reset the fault code or duplicate the previous complaint.

  6. Check for fault codes using ServiceRanger.