Endurant HD
TRTS0950 EN-US
|
September 2024 - B

Fault Code 716: Transmission Selected Gear

J1939: SA 3 SPN 524 FMI 12

Overview

The Mechatronic Transmission Module (MTM) is equipped with solenoids to direct pneumatic flow to actuate the clutch and shift rails and sensors to monitor the clutch and shift rail positions. The Transmission Control Module (TCM) compares the clutch and shift rail commands with the clutch and shift rail positions including speed sensors (ratio calculation) to ensure proper operation.

Detection

The TCM monitors the Transmission Select Gear command, if the command is invalid, the TCM sets the fault code Active.

Conditions to Set Fault Code Active

FMI 12 – Bad Intelligent Device or Component: Inappropriate selected gear relative to output shaft speed.

Fallback

FMI 12:

  • Transmission shifts to Neutral
  • PTO Mode prohibited

Conditions to Set Fault Code Inactive

FMI 12: Condition no longer exists

Possible Causes

FMI 12:

  • TCM
    • Software issue
    • Internal failure
  • PTO (If equipped)
    • PTO Confirm Ball Switch
    • Circuit and/or wiring harness shorted to ground

Additional Tools

  • None

Fault Code 716 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 716 FMI 12 is Active or Inactive, and the transmission is equipped with a PTO, Go to Step B

  • If Fault Code 716 FMI 12 is Active or Inactive and the transmission is not equipped with a PTO, Go to Step C

B
Purpose:Verify TCM Software

  1. Key off.

  2. Allow TCM to perform a complete power down.

  3. Key on with engine off.

  4. Connect Service Ranger.

  5. Go to “Programming”.

  6. Under “Software Information”, verify TCM software version.

  • If TCM software is less than 5516036, update the TCM software to latest available version and inspect PTO Confirm Ball Switch and Circuit. Go to Step V

  • If TCM software is 5516036 or greater, Contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information. Go to Step V

    Note: A corroded and/or contaminated PTO Confirm Ball Switch or Circuit intermittently shorted to ground may cause Fault Code 716 FMI 12 to set Active. Refer to OEM and/or Body Builder guidelines for repair or replacement.

C
Purpose:Verify TCM Software.

  1. Key off.

  2. Allow TCM to perform a complete power down.

  3. Key on with engine off.

  4. Connect ServiceRanger.

  5. Go to “Programming”.

  6. Under “Software Information”, record TCM software in table.

  • If TCM software is less than 5516036, update TCM software to latest available version. Go to Step V

  • If TCM software is 5516036 or greater, contact Eaton Cummins Automated Transmission Technologies at 800-826-4357 for further diagnostic instructions. 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. Connect ServiceRanger.

  5. Go to “Fault Codes”.

  6. Select “Clear All Faults”.

  7. Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.

  8. Check for fault codes using ServiceRanger.