The Endurant XD Series transmissions are equipped with 5 shift rail position sensors and 5 magnets mounted on shift rails A, B, C, D and E. The shift rail position sensors monitor the position of the shift rail magnet and provide the information to the Transmission Control Module for the purpose of making shift decisions, confirming gear engagement, and monitoring shift rail positions. Shift Rail D actuates the Rail D Sliding Clutch to engage the Driven Gear 1st or Reverse Gear. The position sensors are located in the Mechatronic Transmission Module (MTM) and are connected to the Transmission Control Module (TCM) at the 74-Way Transmission Harness Connector.

FMI 0 – Data Valid But Above Normal (Most Severe): Shift Rail D movement beyond the calibrated Driven Gear 1st engagement position for 1 second.

FMI 1 – Data Valid But Below Normal (Most Severe): Shift Rail D movement beyond the calibrated Reverse Gear engagement position for 1 second.

FMI 2 – Data Erratic: Rail D Position duty cycle out of range for 1 second.

FMI 3 – Voltage Above Normal or Shorted High: Rail D Position Sensor circuit shorted to power for 1 second.

FMI 4 – Voltage Below Normal or Shorted Low: Rail D Position Sensor circuit shorted to ground for 1 second.

FMI 5 – Current Below Normal or Open Circuit: Rail D Position Sensor circuit open for 1 second.

FMI 6 – Current Above Normal or Grounded Circuit: Rail D Position Sensor circuit supply voltage out of normal operating range (4.75V to 5.25V) for 1 second.

FMI 7 – Mechanical System Not Responding: Shift Rail D failed interlock function test. Uncommanded Shift Rail D movement from neutral position while Splitter Gear or Driven Gear 2nd was engaged.

FMI 8 – Abnormal Frequency: Rail D Position Sensor signal frequency out of range for 1 second.

FMI 9 – Abnormal Update Rate: Rail D Position Sensor did not detect Shift Rail D magnet for 1 second.

FMI 10 – Abnormal Rate Of Change: Rail D Position value rate of change exceeded when no Shift Rail D movement commanded for 1 second.

FMI 12 – Bad Intelligent Device: Rail D Position Sensor circuit self-check failure for 1 second.

FMI 14 – Special Instructions:  Rail D Position value indicated Reverse Gear engagement position, but Rail C Position Sensor and speed sensors confirmed Splitter Gear or Driven Gear 2nd engagement for 1 second.

FMI 15 - Data Valid but Above Normal (Least Severe): Uncommanded Shift Rail D movement from neutral position toward Driven Gear 1st while Splitter Gear or Driven Gear 2nd was engaged for 2 seconds.

FMI 16 - Data Valid but Above Normal (Moderately Severe): Uncommanded Shift Rail D movement from Driven Gear 1st toward neutral position while speed sensors continued to indicate a Driven Gear 1st ratio.

FMI 17 – Data Valid but Below Normal (Least Severe): Uncommanded Shift Rail D movement from neutral position toward Reverse Gear while Splitter Gear or Driven Gear 2nd was engaged for 2 seconds.

FMI 18 – Data Valid but Below Normal (Moderately Severe): Uncommanded Shift Rail D movement from Reverse Gear toward neutral position while speed sensors continued to indicate a Reverse Gear ratio.

FMI 20 – Data Drifted High: Rail D Position value indicated Driven Gear 1st disengagement but speed sensors and torque continued to indicate a Driven Gear 1st ratio for 2 seconds.

FMI 21 – Data Drifted Low: Rail D Position value indicated Reverse Gear disengagement but speed sensors and torque continued to indicate a Reverse Gear ratio for 2 seconds.

FMI 31 – Condition Exists: Rail D Position value indicated Driven Gear 1st engagement position, but Rail C Position Sensor and speed sensors confirmed Splitter Gear or Driven Gear 2nd engagement for 1 second.

FMI 0, 1, 7, 14, 15, 16, 17, 18, 20, 21, 31: Key cycle and fault condition no longer exist.

FMI 2: Rail D Position duty cycle in range for 10 seconds.

FMI 3: Rail D Position Sensor circuit not shorted to power for 10 seconds.

FMI 4: Rail D Position Sensor circuit not shorted to ground for 10 seconds.

FMI 5: Rail D Position Sensor circuit not open for 10 seconds.

FMI 6: Rail D Position Sensor signal voltage between 4.75 and 5.25 volts for 10 seconds.

FMI 8: Rail D Position Sensor signal frequency in range for 10 seconds.

FMI 9: Shift Rail D magnet detected for 10 seconds.

FMI 12: Rail D Position Sensor circuit self-checks in range for 10 seconds.

FMI 0, 1:

• MTM
  • Rail D Yoke
• Internal Transmission
  • Rail D Sliding Clutch

FMI 2, 3, 4, 5, 6, 8:

• MTM - Rail D Position Sensor
  • Damaged
  • Internal failure
• MTM - Transmission Harness
  • Wiring shorted to power, shorted to ground or open.
• TCM
  • Software issue
  • Internal failure

FMI 7:

• MTM - Rail D
  • Valve Pack C
  • Valve Pack D
  • Rail D cylinder
  • Rail D yoke
  • Rail D detent
• Internal Transmission
  • Rail D sliding clutch
  • Main Shaft

FMI 9:

• MTM - Rail D Cylinder
  • Magnet loose
  • Magnet detached
• MTM - Rail D Position Sensor
  • Loose
  • Damaged

FMI 10, 14, 20, 21, 31:

• MTM - Rail D Position Sensor
  • Internal failure

FMI 12:

• TCM
  • Software issue
  • Internal failure

FMI 15, 16, 17, 18:

• MTM - Rail D Position Sensor
  • Internal failure
• MTM - Rail D Detent
  • Weak or broken spring
  • Worn shift rail or detent

• Endurant XD Service Manual TRSM0960
• Eaton Breakout Box with 74-Way Eaton Diagnostic Adapter - RR1029TR
• Digital Volt/Ohm Meter (DVOM)