Endurant XD
TRTS0960 EN-US
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September 2024 - A

Fault Code 350: Input Speed

J1939: SA 3 SPN 161 FMI 2, 3, 4, 5, 6, 8, 9, 10, 14, 20, 21

Overview

The Endurant XD Series transmissions are equipped with speed sensors to monitor: Input, Countershaft and Output speeds. The speed sensors provide rotational speed inputs to the Transmission Control Module (TCM) for the purpose of verifying clutch engagement, making shift decisions, and confirming gear engagements. The Input Speed Sensor measures the rotational speed of the Input Shaft. The Input and Countershaft speed 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.

Detection

The TCM monitors the Input Speed Sensor signal. If a system failure is detected, the fault is set Active.

Conditions to Set Fault Code Active

FMI 2 – Data Erratic: Input Speed Sensor signal out of range for 5 seconds.

FMI 3 – Voltage Above Normal or Shorted High: Input Speed Sensor circuit shorted to power for 5 seconds.

FMI 4 – Voltage Below Normal or Shorted Low: Input Speed Sensor circuit shorted to ground for 5 seconds.

FMI 5 – Current Below Normal or Open Circuit: Input Speed Sensor circuit open or shorted to power for 5 seconds.

FMI 6 – Current Above Normal or Shorted Circuit: Input Speed Sensor circuit supply voltage out of normal operating range (4.75V to 5.25V) for 5 seconds.

FMI 8 – Abnormal Frequency: Input Speed Sensor signal frequency out of range for 5 seconds.

FMI 9 – Abnormal Update Rate: Input Speed Sensor speed direction unknown for 5 seconds.

FMI 10 – Abnormal Rate of Change: Input Speed Sensor signal rate of change exceeded for 2 seconds.

FMI 14 – Special Instructions: Input Speed value out of range (near 0 RPM) when compared to calculated input speeds based on known Engine, Countershaft, and Output speeds and gear ratio, for 5 seconds.

FMI 20 – Data Drifted High: Input Speed value greater than expected when compared to calculated input speeds based on known Engine, Countershaft, and Output speeds and gear ratio, for 2 seconds.

FMI 21 – Data Drifted Low: Input Speed value less than expected when compared to calculated input speeds based on known Engine, Countershaft, and Output speeds and gear ratio, for 2 seconds.

Fallback

All FMIs

  • Amber warning lamp on
  • If vehicle is moving - Red stop lamp on
  • If Fault Codes 350 and 370 are both Active and transmission is in gear:
    • 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 Fault Codes 350 and 370 are both Active and transmission is not in gear:
    • Urge to Move and Creep Mode prohibited
    • Inertia Brake activation prohibited
    • Non-Neutral modes prohibited
    • PTO Mode prohibited

Conditions to Set Fault Code Inactive

FMI 2: Input Speed Sensor signal in range for 10 seconds.

FMI 3: Input Speed Sensor circuit not shorted to power for 10 seconds.

FMI 4: Input Speed Sensor circuit not shorted to ground for 10 seconds.

FMI 5: Input Speed Sensor circuit not open or shorted to power for 10 seconds.

FMI 6: Input Speed Sensor circuit supply voltage between 4.75V and 5.25V for 10 seconds.

FMI 8: Input Speed Sensor signal frequency in range for 10 seconds.

FMI 9: Input Speed Sensor speed direction known for 10 seconds.

FMI 10: Input Speed Sensor signal rate of change in range for 10 seconds.

FMI 14, 20, 21: Input Speed Sensor signal matches calculated input speeds for 10 seconds.

Possible Causes

FMI 2, 14, 20, 21:

  • MTM - Input Speed Sensor
    • Internal failure
    • Damaged
  • Internal Transmission
    • Mechanical failure
  • TCM
    • Software issue
    • Internal failure

FMI 3:

  • TCM
    • Internal failure

FMI 4, 5, 6, 8, 9, 10:

  • MTM - Input Speed Sensor
    • Internal failure
    • Damaged
  • MTM - Input Shaft Speed Sensor Harness
    • Wiring shorted to power, shorted to ground or open
  • MTM - Transmission Harness
    • Wiring shorted to power, shorted to ground or open
  • TCM
    • Software issue
    • Internal failure

Additional Tools

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

Component Identification

_Graphics/LineArt/TRTS0960_FC275_ComponentID.png

1. Transmission Control Module (TCM) Cover

2. Transmission Control Module (TCM)

3. 74-Way Transmission Harness Connector (TCM-side)

4. 74-Way Transmission Harness Connector (MTM-side)

5. Transmission Control Module (TCM) Seal

6. Mechatronic Transmission Module (MTM)

Fault Code 350 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 350 FMI 3 is Active or Inactive, Go to Step G

  • If Fault Code 350 FMI 4, 5, 6, 8, 9, 10 is Active or Inactive, Go to Step B

  • If Fault Code 350 FMI 2, 14, 20, 21 is Active or Inactive, Go to Step D

B
Purpose: Verify condition of TCM 74-Way Connector.

  1. Key off.

  2. Remove TCM from MTM with 20-Way TCM Vehicle Harness Connector and 20-Way TCM Body Harness Connector connected.

    _Graphics/LineArt/TRTS0950_FC511_Check74WayTCM.png

  3. Inspect TCM side of the 74-Way Transmission Harness Connector, verify connector is free from contamination and corrosion; terminals are not bent, spread or loose; and there is no damage to connector body.

  4. Inspect TCM Seal, verify seal is properly installed and not damaged.

C
Purpose:Verify Input Speed Sensor power supply at TCM.

  1. Key off.

  2. Connect Eaton Breakout Box with 74-Way Eaton Diagnostic Adapter to TCM 74-Way Connector.

    _Graphics/LineArt/TRTS0950_BreakoutBoxtoTCM.png

  3. Key on.

  4. Measure voltage at Eaton Breakout Box between Pin 54 and Pin 55. Record reading in table.

    _Graphics/LineArt/TRTS0950_FC350_DVOM54and55V.png

  5. Compare reading(s) in table.

Ignition StatePinsRangeReading(s)
Key on54 to 554.75–5.25 V
D
Purpose: Verify condition of TCM 74-Way Connector.

  1. Key off.

  2. Remove TCM from MTM with 20-Way TCM Vehicle Harness Connector and 20-Way TCM Body Harness Connector connected.

    _Graphics/LineArt/TRTS0950_FC511_Check74WayTCM.png

  3. Inspect TCM side of the 74-Way Transmission Harness Connector, verify connector is free from contamination and corrosion; terminals are not bent, spread or loose; and there is no damage to connector body.

  4. Inspect TCM Seal, verify seal is properly installed and not damaged.

E
Purpose: Verify Input Speed Sensor power supply at TCM.

  1. Key off.

  2. Connect Eaton Breakout Box with 74-Way Eaton Diagnostic Adapter to TCM 74-Way Connector.

    _Graphics/LineArt/TRTS0950_BreakoutBoxtoTCM.png

  3. Key on.

  4. Measure voltage at Eaton Breakout Box between Pin 54 and Pin 55. Record reading in table.

    _Graphics/LineArt/TRTS0950_FC350_DVOM54and55V.png

  5. Compare reading(s) in table.

Ignition StatePinsRangeReading(s)
Key on54 to 554.75–5.25 V
F
Purpose: Verify mechanical condition of the PTO Drive Gear.

  1. Key off.

  2. Remove MTM.

    Note: MTM removal and installation requires transmission be removed from vehicle. Reference Endurant XD Service Manual TRSM0960, Transmission Removal Service Procedure.

  3. Inspect the PTO Drive Gear for missing teeth and excessive movement.

    _Graphics/LineArt/TRTS0960_FC350_ToneWheel.png

  • If no missing teeth or no excessive movement evident, Contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information. Go to Step V

  • If missing teeth and/or excessive movement evident, identify cause for missing teeth and/or excessive movement and repair. Go to Step V

G
Purpose: Check for active or inactive fault codes.

  1. Confirm a Service Activity Report was downloaded and sent to Eaton.

  2. Retrieve and record the transmission fault codes and FMI’s, and their occurrences and timestamps.

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.

  • If no fault codes set and vehicle operates properly, test complete.

  • If Fault Code 350 sets Active, contact Eaton Cummins Automated Transmission Technologies at +1 800-826-4357 for further diagnostic instructions.

  • If a fault code other than 350 sets Active, go to Fault Code Isolation Procedure Index.