Fault Code 902: Split Shaft PTO Request
J1939: SA 3 SPN 3454 FMI 4, 9, 12, 13, 14, 19, 20, 31
Overview
The Endurant XD Series transmission incorporates enhanced controls for Power Take-Off (PTO) operation. When PTO operation is required the Transmission Control Module (TCM) receives a request (Input) for PTO operation, determines if operating conditions are suitable, and supplies a signal (Output) to engage the PTO. Once engaged the TCM receives a confirmation to complete the operation. Reference Endurant XD Driver Instructions TRDR0960 for PTO operation.
The TCM can be configured to operate a PTO with messages over the vehicle Primary Data Link J1939A or from a PTO 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 "J1939 Control Only", PTO operation messages are exchanged between the TCM and a OEM vehicle ECU. If the TCM is configured to "Hardwire Control Only, PTO operation is controlled by Input and Output signals from a hardwired switch circuit. The TCM has the functionality to support operation of two PTOs at the same time; one over the Primary Data Link J1939A and one from a hardwired PTO switch circuit.
PTO circuit inputs and outputs are connected to the TCM in the 20-Way TCM Body Harness Connector. The PTO and PTO circuit are installed by the OEM or body builder. Reference Input / Output Calibration of the Appendix for recommended PTO circuit wiring diagrams.
Detection
The TCM monitors the Split Shaft PTO Request J1939 messages or the hardwired Split Shaft PTO Request circuit input signal. If the messages or signal are not received or are invalid, the fault is set Active.
Conditions to Set Fault Code Active
FMI 4 – Voltage Below Normal or Shorted Low: Split Shaft PTO Request circuit input signal indicated short to ground for 5 seconds.
FMI 9 – Abnormal Update Rate: Split Shaft PTO Request messages not received for 5 seconds.
FMI 12 – Bad Intelligent Device: TCM has detected an internal processing error.
FMI 13 – Out of Calibration: Split Shaft PTO Request message not available for 5 seconds.
FMI 14 – Special Instructions: The TCM detected invalid I/O Package calibration.
FMI 19 – Received Network Data in Error: Split Shaft PTO Request messages invalid for 5 seconds.
FMI 20 – Data Drifted High: Split Shaft PTO Request circuit input signal out of range (4.00–5.25 V) for 5 seconds.
FMI 31 – Condition Exists: The TCM detected invalid I/O Package calibration.
Fallback
All FMIs:
- Amber warning lamp on
- Split Shaft PTO Mode prohibited
Conditions to Set Fault Code Inactive
FMI 4: Split Shaft PTO Request circuit not shorted to ground for 10 seconds.
FMI 9, 13, 19: Split Shaft PTO Request messages received and valid for 10 seconds.
FMI 12: Key cycle and fault condition no longer exists.
FMI 14, 31: Valid I/O Package calibration file is configured in TCM.
FMI 20: Split Shaft PTO Request circuit input signal in range for 10 seconds.
Possible Causes
FMI 4, 20:
- Vehicle Harness - Split Shaft PTO Request circuit
- Shorted to power, shorted to ground or open circuit
FMI 9, 13, 19:
- Vehicle Components - Vehicle ECU(s)
- Split Shaft PTO Request J1939 message not enabled
- Other vehicle ECU(s) faulted
- Vehicle Harness - Primary Data Link (J1939A)
- Shorted to power, shorted to ground or open circuit
- Terminals bent, spread, corroded, or loose
FMI 12:
- TCM
- Software issue
- Internal failure
FMI 14, 31:
- TCM
- Invalid I/O Package calibration file configured in TCM
Fault Code 902 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 902 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V
If Fault Code 902 FMI 4, 20 is Active, Go to Step B
If Fault Code 902 FMI 4, 20 is Inactive, the intermittent nature of the fault makes it likely that the problem is in the Split Shaft PTO Request circuit. Go to Step C
Note: Split Shaft PTO and circuit wiring are installed by OEM or body builder.
If Fault Code 902 FMI 9 or 19 is Active or Inactive, refer to OEM guidelines for repair of the vehicle Split Shaft PTO Request message (SPN 3454). Go to Step V
If Fault Code 902 FMI 12 is Active, replace Transmission Control Module (TCM). Go to Step V
If Fault Code 902 FMI 12 is Inactive, Go to Step V
If Fault Code 902 FMI 13 is Active, refer to OEM and enable Split Shaft PTO Request message (SPN 3454). Go to Step V
If Fault Code 902 FMI 13 is Inactive, Split Shaft PTO is properly configured. Go to Step V
If Fault Code 902 FMI 14 or 31 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 902 FMI 14 or 31 is Inactive, Go to Step V
Key on.
Connect ServiceRanger.
Go To “Configuration”.
Select “PTO”.
Record "Split-Shaft PTO Configuration" Current Value.
If "Split-Shaft PTO Configuration" Current Value indicates “Disabled” and Split-Shaft PTO circuit is properly installed and wired, select a Stationary or Mobile Analog (hardwired) option and follow on-screen prompts. Go to Step V
If "Split-Shaft PTO Configuration" Current Value indicates a Stationary or Mobile Analog (hardwired) option and the Split-Shaft PTO Request 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 Split Shaft PTO Request circuit. Go to Step V
Note: Split Shaft PTO and circuit wiring are installed by OEM or body builder.
| Fault Code 902: SSPTO Request | |||
|---|---|---|---|
| Package # and Description | 20-Way TCM Body Connector Pin(s) | Component(s) | |
| Input / Output Calibration Package 20 of TRIG2630: Split Shaft PTO | 6 | 14 | SSPTO Request Switch |
| Input / Output Calibration Package 21 of TRIG2630: PTO 1 + Split Shaft PTO | |||
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 902 sets Active, Go to Step A
If a fault code other than 902 sets Active, troubleshoot per the Fault Code Isolation Procedure Index.