Fault Code 84: Shift Device Not Configured
J1587: MID 130 SID 18 FMI 13
J1939: SA 3 SPN 751 FMI 13
Overview
The UltraShift PLUS 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 84 indicates that the TECU detected an incorrect Driver Interface Type configuration.
Detection
The TECU determines the type of Shift Control Device the vehicle is equipped with during the initial power up. Fault Code 84 sets Active when the stored Driver Interface Type configuration in the TECU does not match the Shift Device on the vehicle, provided there are no low battery system fault codes set.
Conditions to Set Fault Code Active
FMI 13 – Out of Calibration: The stored Driver Interface Type configuration file does not match the Shift Device on the vehicle.
Fallback
FMI 13
- “F” flashes in gear display.
- Service light flashes (if equipped).
- Engine may not crank.
- Transmission will not engage a gear from neutral.
Conditions to Set Fault Code Inactive
FMI 13: This fault code is never set Inactive. Fault Code 84 only sets in an Active state.
Possible Causes
FMI 13
- TECU
- Driver Interface Type configuration incorrect or unknown
Component Identification
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1. Transmission Electronic Control Unit (TECU) |
Fault Code 84 Troubleshooting
Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure.
If Fault Code 84 is Active, Go to Step B
If Fault Code 84 is Inactive, test complete. Go to Step V
Key on with engine off.
Connect ServiceRanger.
In ServiceRanger, go to “Service Routines”.
Select “Driver Interface Reset Utility”.
Select and perform “Transmission Driver Interface Type Reset”.
Key off.
NoticeKey on with engine off.
Connect ServiceRanger.
Retrieve and record the transmission fault codes.
If Driver Interface Device is now calibrated and Fault Code 84 is Inactive, Go to Step V
If Driver Interface Device could not be calibrated and Fault Code 84 remains Active, replace Transmission Electronic Control Unit (TECU). Go to Step A
Key off.
Reconnect all connectors and verify that all components are properly installed.
Key on with engine off.
Clear fault codes using ServiceRanger.
Check for fault codes using ServiceRanger.
If no fault codes set Active and vehicle operates properly, test complete.
If Fault Code 84 sets Active during the test drive, Go to Step A
If a fault code other than 84 sets Active, troubleshoot per Fault Code Isolation Procedure Index.