Eaton Fuller Hybrid Transmission Fault Code 58 – Output Shaft Speed Sensor

Fault code for Eaton Hybrid Drive Systems models (MY08) EH-8E306A-U, EH-8E306A-UPG, EH-8E306A-UP, EH-8E306A-CD, EH-8E306A-T, EH-6E606B-CD, (MY09) EH-8E406A-U/P, EH-8E406A-UP, EH-8E406A-UPG, EH-8E406A-CD, EH-8E406A-CDG, EH-8E406A-CDR, EH-8E406A-T, EH-6E706B-CD, EH-6E706B-P and EH-6E706B-UPG. Read below to learn how to test, clear and fix fault code errors for your Freightliner, Mack, Peterbilt, Kenworth, Volvo, International, and heavy-duty truck and equipment. The Output Shaft Speed Sensor is located on the rear bearing cover at the 12 o’clock position. The sensor is a magnetic pickup that produces an AC voltage as the tone wheel teeth moves past the end of the sensor. At idle, the Speed Sensor output is low and it increases as the speed of the output shaft increases.

Fault Code 58 – Output Shaft Speed Sensor Detection

The following preconditions must be met before the system detects the fault:

  • Transmission Electronic Control Unit (TECU) ignition voltage is greater than 7 volts and less than 16 volts.
  • FMI 2 does not set if there is already an Active FMI 5 for the Input or Output Shaft Speed Sensors.

Note: When troubleshooting an Inactive code refer to the Product Diagnostic Mode (PDM)

Conditions to Set Fault Code Active

  • FMI 2 is set when the TECU output shaft speed is compared to the input shaft speed and it produces an inconsistent reading for 1 second or greater.
  • FMI 3, 4 are set when the TECU detects a short to ground, short to battery, or the output shaft speed is 0 for 1 second or greater.
  • FMI 5 is set when the TECU detects an open circuit and the Output Shaft Speed Sensor is 0 for 1 second or greater.

Fallback When Fault Code 58 is set the following conditions occur:

  • Red “Service” light illuminates and an “F” flashes in the gear display.
  • Fault is stored in TECU memory.
  • Operation mode changes to “AutoShift Fallback” mode.
  • If this fault occurs while moving, the transmission remains in the current gear and the clutch opens when the vehicle stops.

Conditions to Set Fault Code Inactive

Only Inactive faults can be cleared from the Transmission Electronic Control Unit (TECU) or HCM history using ServiceRanger. The TECU automatically clears the faults from history after 200 hours and the HCM automatically clears the faults from history after the fault has been Inactive for 200 hours.

This fault code can be caused by any of the following:

  • FMI 2
    • Output Shaft Speed Sensor
    • TECU
    • Transmission Harness
    • Damaged Transmission Gearing
    • Contamination on the Output Shaft Speed Sensor
  • FMI 3, 4, 5
    • Output Shaft Speed Sensor
    • TECU
    • Transmission Harness

Fault Code 58 – Output Shaft Speed Sensor Test

Component Identification:

Harness Front View TECU - Vehicle Interface Connector for Fuller transmission

Harness Front View
(TECU – System Interface Connector)

Output Shaft Speed Sensor

Output Shaft Speed Sensor

NOTE: Refer to the Eaton Hybrid Component and Connector Location for Connector Locations in MY08 Systems

NOTE: Refer to the Eaton Hybrid Component and Connector Location for Connector Locations in MY09 Systems.

TECU Output Shaft Speed Sensor connector location Eaton Fuller transmission

STEP 1. Verify continuity of Transmission Harness sensor circuits.

  1.  Retrieve Active fault codes and FMIs with ServiceRanger using the 9-Way Diagnostic Connector.
  2. Key off.
  3. Disconnect negative battery cable.
  4. Disconnect the Transmission Harness 38- Way Connector.
  5. Measure resistance between the Transmission Harness 38-Way Connector Pin 23 and Pin 24 and Pin 23 and ground:
    • If resistance is 2K–4.5K ohms and Pin 23 to ground is 10K ohms or greater, go to Step 2.
    • If resistance is outside of the range, go to Step 4.

STEP 2. Verify voltage of Transmission Harness sensor circuits to ground.

  1. Key on.
  2. Measure voltage between the Transmission Harness 38-Way Connector Pin 23 and ground.
    • If voltage is 0 volts, go to Step 3.
    • If voltage is 11–13 volts, repair the short to battery in the Vehicle Harness, then go to Step 6.

STEP 3. Verify integrity of Output Shaft Speed Sensor.

  1. Inspect Output Shaft Speed Sensor for contamination or damage.
    • If no problem found, replace Transmission Electronic Control Unit (TECU) (only if fault code is Active), then go to Step 6.
    • If problem is found or were sent here from Step 4 or 5, replace Output Shaft Speed Sensor and inspect the Tone Wheel for damage, looseness or corrosion. Go to Step 6.

STEP 4. Verify continuity of Output Shaft Speed Sensor.

  1. Disconnect the Transmission Harness from the Output Shaft Speed Sensor.
  2.  Measure resistance between Output Shaft Speed Sensor Pin A and Pin B:
    • If resistance is 2K–4.5K ohms, go to Step 5.
    • If resistance is outside of range, go to Step 3.

STEP 5. Verify continuity of Output Shaft Speed Sensor and ground.

  1. Measure resistance between Output Shaft Speed Sensor Pin A and ground:
    • If resistance is 10K ohms or greater, replace the Transmission Harness, then go to Step 6.
    • If resistance is less than 10K ohms, go to Step 3.

STEP 6. Verify repair.

  1. Key off.
  2. Reconnect all connectors and the negative battery cable.
  3. Verify proper installation of Speed Sensor.
  4.  Key on.
  5. Clear codes, see  Clear Inactive Faults.
  6. Drive the vehicle and attempt to reset the code.
  7. Check for codes, see View Active and Inactive Faults.
    • If no codes, test is complete.
    • If fault Code 58 appears, find error in testing, go to Step 1.
    • If a code other than 58 appears, see Fault Code Index List.

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