Fuller Advantage
TRTS0980 EN-US
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November 2023 - A

Fault Code 83: Invalid Shift Lever Position

J1587 MID 130 SID 18 FMI 14

J1939 SA 3 SPN 751 FMI 14

Overview

The Fuller Advantage transmission may be equipped with an analog shift control device. The Transmission Electronic Control Unit (TECU) supplies the analog Shift Control Device a 5-volt reference through OEM wiring. This voltage is reduced by resistive ladder circuitry in the shift device, based on the position the driver selects. The return voltage to the TECU indicates the position of the Shift Lever. Fault Code 83 indicates the TECU did not identify a Shift Lever position.

Detection

The TECU monitors Shift Lever position by supplying voltage to the Shift Lever and measuring the returned voltage. When the return voltage received by the TECU does not match any known shift mode this fault code sets Active.

Conditions to Set Fault Code Active

FMI 14 – Special Instructions: Selected lever position is invalid for 0.5 seconds or longer.

Fallback

FMI 14

  • “F” flashes in gear display.
  • Service light flashes (if equipped).
  • Transmission may not engage a gear from neutral.
  • Transmission enters downshift-only mode.

Conditions to Set Fault Code Inactive

FMI 14: TECU recognizes a valid Shift Lever position from the Shift Lever after 0.2 seconds.

Possible Causes

FMI 14

  • Vehicle Analog Shift Device
    • Internal failure
    • Lever positioned between two modes
  • Eaton Cobra Shift Lever
    • Internal failure
    • Lever positioned between two modes

Component Identification

TRTS-0940/_Graphics/LineArt/TRTS0940_FC83_ID1.png

Eaton Cobra Lever

Fault Code 83 Troubleshooting

A
Purpose:Check for Active or Inactive fault codes.

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

B
Purpose:Verify lever positions in gear display.

  1. Key on with engine off.

  2. Set parking brake and chock wheels.

  3. Depress service brake pedal.

  4. Shift the Lever into Reverse (R), Drive (D), Low (L) and Neutral (N) modes.

  5. Monitor the vehicle gear display and Shift Lever mode lights (if equipped). Ensure that when each mode is selected an appropriate gear is engaged by the transmission.

  • If lever positions do not match gear display, replace Shift Lever. Go to Step V

  • If lever positions match gear display, test complete. 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. Clear fault codes using ServiceRanger.

  5. Drive vehicle and attempt to reset the code or duplicate the previous complaint.

  6. Check for fault codes using ServiceRanger.