Endurant XD
TRTS0960 EN-US
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December 2024 - D

Fault Code 702: Driveline Engagement

J1939: SA 3 SPN 560 FMI 2, 11, 12, 14, 20, 21, 31

Overview

The Endurant XD Series transmissions are equipped with solenoid valves that direct vehicle Supply Air to and from the Linear Clutch Actuator (LCA) and shift rail cylinders for clutch and shift rail actuation. Position sensors monitor clutch and shift rail positions, and speed sensors monitor shaft speeds.

The sensor information is provided to the Transmission Control Module (TCM) for the purpose of making clutch engagement or disengagement decisions, making shift decisions, and confirming gear engagement. The TCM compares the clutch and shift rail commands to the clutch and shift rail positions and the shaft speeds (ratio calculation) to ensure the transmission is operating properly.

The solenoids, sensors, LCA and shift rails are located in the Mechatronic Transmission Module (MTM) and connected to the TCM at the 74-Way Transmission Harness Connector.

Detection

The TCM monitors clutch and shift rail operation. If a system failure is detected, the fault is set Active.

Conditions to Set Fault Code Active

FMI 2 – Data Erratic, Intermittent Or Incorrect: During a Clutch Calibration, position sensor values indicated main shaft neutral position but speed sensors indicated in gear ratio.

FMI 11 – Root Cause Unknown: Output Speed Sensor signal and Countershaft Speed Sensor signal direction mismatch for 2 seconds.

FMI 12 – Bad Intelligent Device: Inappropriate clutch engagement on disengaged main shaft without speed sensor confirmation of mainshaft neutral for 1 second.

FMI 14 – Special Instructions: Inappropriate shift rail movement commanded when vehicle is stationary resulting in drive line engagement for 1 second.

FMI 20 – Data Drifted High: Shift Rail C and E Position Sensor values indicated gear engagement but speed sensors did not for 2 seconds.

FMI 21 – Data Drifted Low: Shift Rail D and E Position Sensor values indicated gear engagement but speed sensors did not for 2 seconds.

FMI 31 – Condition Exists: Inappropriate delay in clutch torque after commanded during vehicle launch.

Fallback

FMI 2:

  • Amber warning lamp on
  • Coast Mode and Neutral Coast prohibited
  • Urge to Move and Creep Mode prohibited
  • Inertia Brake activation prohibited
  • Upshifts prohibited
  • Clutch engagements prohibited
  • Non-Neutral modes prohibited
  • PTO Mode prohibited
  • If vehicle is moving:
    • Red stop lamp on

FMI 11:

If Shift Rail D is disengaged:

  • Amber warning lamp on
  • Driven Gear 1st engagement prohibited Amber warning lamp on
  • Reverse Gear engagement prohibited

If Shift Rail D is engaged:

  • Urge to Move and Creep Mode prohibited
  • Inertia Brake activation prohibited
  • Non-Neutral modes prohibited
  • PTO Mode prohibited
  • If vehicle is moving:
    • Red stop lamp on

FMI 12, 14, 31:

  • Amber warning lamp on
  • Urge to Move and Creep Mode prohibited
  • Non-Neutral modes prohibited
  • PTO Mode prohibited
  • If vehicle is moving:
    • Red stop lamp on

FMI 20, 21:

  • Amber warning lamp on
  • Urge to Move and Creep Mode prohibited
  • Clutch engagements prohibited
  • PTO Mode prohibited
  • If vehicle is moving:
    • Red stop lamp on

Conditions to Set Fault Code Inactive

All FMIs: Key cycle and fault condition no longer exist.

Possible Causes

FMI 2:

  • Rail C or D Position Sensors

FMI 11, 12, 14:

  • TCM
    • Internal failure
    • Software issue

FMI 20, 21:

  • Rail C, D or E Position Sensors

FMI 31:

  • Parking Brake Switch/signal
    • Vehicle Parking Brake set and the driver selected a Reverse or Drive Mode
    • Internal failure
  • TCM
    • Internal failure
    • Software issue

Additional Tools

  • None

Fault Code 702 Troubleshooting

A
Purpose:Check for active or inactive fault codes.

  1. Set vehicle parking brake and chock wheels.

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

  • If Fault Code 702 FMI 2, 14, 20, 21 is Active or Inactive, contact Eaton Cummins Automated Transmission Technologies at +1 800-826-4357 for further diagnostic instructions. Go to Step V

  • If Fault Code 702 FMI 31 is Active or Inactive, Go to Step B

  • If Fault Code 702 FMI 11, 12 is Active or Inactive, Go to Step C

B
Purpose:Verify Vehicle Parking Brake Switch signal with ServiceRanger.

  1. Key on with engine running.

  2. Allow air pressure to build to governor cut off.

  3. Key off.

  4. Key on with engine off.

  5. Connect ServiceRanger.

  6. Go To “Data Monitor”.

  7. From the “Default Parameter Files” tab, select “Vehicle Brake Messages”.

  8. Monitor 70 - Parking brake switch status. Record reading in table.

  9. Depress and hold service brake.

  10. Release vehicle parking brake.

  11. Monitor 70 - Parking brake switch status value. Record reading in table.

  12. Set vehicle parking brake.

  13. Monitor 70 - Parking brake switch status. Record reading in table.

  14. Compare reading(s) in table.

  • If readings are out of range, refer to OEM guidelines for repair or replacement of the Parking Brake Switch/signal. Go to Step V

  • f readings are in range, Contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information. Go to Step V

Parking Brake StateParameterRangeReading(s)
Set70-Parking brake switch statusSet
Not set70-Parking brake switch statusNot set
Set70-Parking brake switch statusSet
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 5516018, update TCM software to latest available version. Go to Step V

  • If TCM software is equal to or greater than 5516018, Contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information. Go to Step V

TCM Software Version
V
Purpose:Verify repair.

  1. Key off.

  2. Reconnect all connectors and verify 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.