Fault Code 983: Auxiliary Trans Range Switch
J1939: SA 3 SPN 3960 FMI 4, 12, 13, 14, 20
Overview
The Endurant XD Pro Transmission can be combined with a 2, 3, or 4-speed auxiliary transmission for additional gear ratio coverage. When auxiliary transmission operation is required the Transmission Control Module (TCM) receives a gear engagement signal (Input) then adjusts the transmission shift strategy and launch characteristics for the new auxiliary transmission gear ratio. Reference Endurant XD Driver Instructions TRDR0960 for Auxiliary Transmission operation.
The TCM can be configured for operation with a 2, 3, or 4-speed auxiliary transmission with messages over the vehicle Primary Data Link J1939A or from a switch circuit hardwired directly to the TCM. The TCM is equipped to receive 4 switch inputs and control 3 relay outputs that can be configured in an Input/Output (I/O) Package to support various vocational features.
If the TCM is configured to “2, 3, or 4-Speed Aux Trans... - J1939”, auxiliary transmission gear engagement messages are provided to the TCM by an OEM vehicle ECU. If the TCM is configured to “2, 3, or 4-Speed Aux Trans... - TCM Hardwired”, auxiliary transmission gear engagement notification signal (Input) is provided to the TCM from a hardwired switch circuit.
The auxiliary transmission circuit input is connected to the TCM in the 20-Way TCM Body Harness Connector. The auxiliary transmission circuit is installed by the OEM or body builder. Reference Input / Output Calibration in the Appendix for recommended Auxiliary Transmission circuit wiring diagrams.
Detection
The TCM monitors the Auxiliary Trans Range Switch hardwired circuit input signal. If the signal is out of range, the fault is set Active.
Conditions to Set Fault Code Active
FMI 4 – Voltage Below Normal or Shorted Low: Auxiliary Trans Range Switch circuit input signal shorted to ground for 5 seconds.
FMI 12 – Bed Intelligent Device: TCM has detected an internal processing error.
FMI 13 – Out of Calibration: The TCM detected invalid I/O Package calibration.
FMI 14 – Special Instructions: The TCM detected invalid I/O Package calibration.
FMI 20 – Data Drifted High: Auxiliary Trans Range Switch circuit input signal out of range (4.00–5.25 V) for 5 seconds.
Fallback
All FMIs:
- Amber warning lamp on
- No degraded modes
- Auxiliary Trans Range Switch inoperative
Conditions to Set Fault Code Inactive
FMI 4: Auxiliary Trans Range Switch circuit not shorted to ground for 10 seconds.
FMI 12: Key cycle and fault condition no longer exits.
FMI 13, 14: Valid I/O Package calibration file is configured in TCM.
FMI 20: Auxiliary Trans Range Switch circuit input signal in range for 10 seconds.
Possible Causes
FMI 4, 20:
- Vehicle Harness - Auxiliary Trans Range Switch Circuit
- Shorted to power, shorted to ground or open circuit
FMI 12:
- TCM
- Internal failure
- Software issue
FMI 13, 14:
- TCM
- Invalid I/O Package calibration file configured in TCM
Additional Tools
- None
Fault Code 983 Troubleshooting
Set vehicle parking brake and chock wheels.
Record transmission fault codes, FMIs, occurrences, and timestamps from Service Activity Report created during the Diagnostic Procedure.
If Fault Code 983 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V
If Fault Code 983 FMI 4, 20 is Active, Go to Step B
If Fault Code 983 FMI 4, 20 is Inactive, the intermittent nature of the fault makes it likely that the problem is in the Auxiliary Trans Range Switch circuit. Go to Step C
Note: Auxiliary Trans Range Switch circuit wiring is installed by OEM or body builder.
If Fault Code 983 FMI 12 is Active, replace Transmission Control Module (TCM). Go to Step V
If Fault Code 983 FMI 12 is Inactive, Go to Step V
If Fault Code 983 FMI 13 or 14 is Active, Contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information. Go to Step V.
If Fault Code 983 FMI 13 or 14 is Inactive, Go to Step V
Key on.
Connect ServiceRanger.
Go To “Configuration”.
Select “Vehicle”.
Record "Multi-Speed Driveline Configuration" Current Value.
If "Multi-Speed Driveline Configuration" Current Value indicates "Not Installed" and Auxiliary Trans Range Switch circuit is properly installed and wired, select the appropriate "- TCM Hardwired" option and follow on-screen prompts. Go to Step V
If "Multi-Speed Driveline Configuration" Current Value indicates a " - TCM Hardwired" option and Auxiliary Trans Range Switch circuit is properly installed and wired, Go to Step C
Key on with engine off.
Connect ServiceRanger.
Go To “Configuration”.
Select “Calibrations” tab.
Record "I/O Package" Current Value.
Based on I/O package configured refer to I/O circuit schematic indicated in table. Contact OEM or body builder for repair or replacement of Auxiliary Trans Neutral Range Actuator switch circuit. Go to Step V
Note: Auxiliary Trans Range Switch circuit wiring is installed by the OEM or body builder.
| Fault Code 983: Auxiliary Trans Range Switch | ||||||
|---|---|---|---|---|---|---|
| Package # and Description | 20-Way TCM Body Connector Pin(s) | Component(s) | ||||
| Input / Output Calibration Package 3: 2-Speed Aux Trans + Rock Free Mode | 14 | 15 | Normally Open Pressure Switch | Aux Trans Vehicle Controls High Range Air Line | ||
| Input / Output Calibration Package 12: 2-Speed Aux Trans | 14 | 15 | ||||
| Input / Output Calibration Package 13: 2-Speed Aux Trans + Secondary Shift Mode | 5 | 15 | ||||
| Input / Output Calibration Package 32: 2-Speed Aux Trans + Reverse Output | 14 | 15 | ||||
| Input / Output Calibration Package 38: 3-Speed Aux Trans - Underdrive, Direct, Overdrive (UD, D, OD) | 14 | 15 | 16 | |||
| Input / Output Calibration Package 39: 3-Speed Aux Trans (UD, D, OD) + Rock Free Mode | 14 | 15 | 16 | |||
| Input / Output Calibration Package 40: 3-Speed Aux Trans (UD, D, OD) + Secondary Shift Mode | 14 | 15 | 16 | |||
| Input / Output Calibration Package 41: 3-Speed Aux Trans (UD, D, OD) + Rock Free Mode + Secondary Shift Mode | 14 | 15 | 16 | |||
| Input / Output Calibration Package 42: 3-Speed Aux Trans - Underdrive, Neutral, Direct, Overdrive (UD, N, D, OD) | 4 | 14 | 15 | 16 | ||
| Input / Output Calibration Package 43: 3-Speed Aux Trans (UD, N, D, OD) + Rock Free Mode | 4 | 14 | 15 | 16 | ||
| Input / Output Calibration Package 44: 4-Speed Aux Trans - Low, Underdrive, Direct, Overdrive (L, UD, D, OD) | 4 | 14 | 15 | 16 | ||
| Input / Output Calibration Package 45: 4-Speed Aux Trans (L, UD, D, OD) + Rock Free Mode | 4 | 14 | 15 | 16 | ||
| Input / Output Calibration Package 46: 4-Speed Aux Trans - Low, Underdrive, Neutral, Direct, Overdrive (L, N, UD, D, OD) | 4 | 14 | 15 | 16 | ||
Key off.
Reconnect all connectors and verify all components are properly installed.
Key on with engine off.
Connect ServiceRanger.
Go To “Fault Codes”.
Select “Clear All Faults”.
Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.
Check for fault codes using ServiceRanger.
If no fault codes set and vehicle operates properly, test complete.
If Fault Code 983 sets Active, Go to Step A
If a fault code other than 983 sets Active, troubleshoot per the Fault Code Isolation Procedure Index.