Endurant HD
TRTS0950 EN-US
|
November 2024 - B

Fault Code 900: PTO 1 Request

J1939: SA 3 SPN 3452 FMI 4, 9, 12, 13, 14, 19, 20, 31

Overview

The Endurant HD 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 HD Driver Instructions based on transmission model (TRDR0950/TRDR0955) 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 PTO 1 Request J1939 messages or the hardwired PTO 1 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: PTO 1 Request circuit input signal indicated short to ground for 5 seconds.

FMI 9 – Abnormal Update Rate: PTO 1 Request messages not received for 5 seconds.

FMI 12 – Bad Intelligent Device: TCM has detected an internal processing error.

FMI 13 – Out of Calibration: PTO 1 Request message not available for 5 seconds.

FMI 14 – Special Instructions: The TCM has detected invalid I/O Package calibration.

FMI 19 – Received Network Data in Error: PTO 1 Request messages invalid for 5 seconds.

FMI 20 – Data Drifted High: PTO 1 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
  • PTO 1 Mode prohibited

Conditions to Set Fault Code Inactive

FMI 4: PTO 1 Request circuit not shorted to ground for 10 seconds.

FMI 9, 13, 19: PTO 1 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: PTO 1 Request circuit input signal in range for 10 seconds.

Possible Causes

FMI 4, 20:

  • Vehicle Harness - PTO 1 Request circuit
    • Shorted to power, shorted to ground or open circuit

FMI 9, 13, 19:

  • Vehicle Components - Vehicle ECU(s)
    • PTO 1 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 900 Troubleshooting

A
Purpose:Identify Transmission Model.

  1. Set vehicle parking brake and chock wheels.

  2. Record transmission model from Service Activity Report created during the Diagnostic Procedure.

B
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.

C
Purpose:Verify PTO 1 Hardwire controlled configuration with ServiceRanger.

  1. Key on.

  2. Connect ServiceRanger.

  3. Go To “Configurations”.

  4. Select “PTO”.

  5. Record “PTO 1” Current Value.

  • If “PTO 1” Current Value indicates “Disabled” and a PTO is properly installed and wired, select a “Hardwire Control Only” option and follow on-screen prompts. Go to Step V

  • If “PTO 1” Current Value indicates a “Hardwire Control Only” option and a PTO is properly installed and wired, refer to OEM or body builder guidelines for repair or replacement of “PTO 1” Request switch or circuits. Go to Step V

    Note: PTO and wiring are installed by the OEM or body builder, reference TRIG2610 for PTO system installation and wiring diagrams.

D
Purpose:Verify PTO 1 J1939 controlled configuration with ServiceRanger.

  1. Key on.

  2. Connect ServiceRanger.

  3. Go To “Configurations”.

  4. Select “PTO”.

  5. Record “PTO 1” Current Value.

  • If “PTO 1” Current Value indicates a J1939 Control or J1939 Request option and a PTO is not installed, select “Disabled” and follow on-screen prompts. Go to Step V

  • If “PTO 1” Current Value indicates a J1939 Control or J1939 Request option and a PTO is properly installed and wired, refer to OEM guidelines regarding OEM ECU PTO configuration. Go to Step V

    Note: PTO and wiring are installed by the OEM or body builder, reference TRIG2610 for PTO system installation and wiring diagrams.

E
Purpose:Check for Active or Inactive fault codes.

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

  • If Fault Code 900 FMI 4, 20 is Active, Go to Step F

  • If Fault Code 900 FMI 4, 20 is Inactive, the intermittent nature of the fault makes it likely that the problem is in the PTO 1 Request circuit. Go to Step G

    Note: PTO and circuit wiring are installed by OEM or body builder.

  • If Fault Code 900 FMI 9, 19 is Active or Inactive, refer to OEM guidelines for repair of the vehicle PTO 1 Request message (SPN 3452). Go to Step V

  • If Fault Code 900 FMI 12 is Active, replace Transmission Control Module (TCM). Go to Step V

  • If Fault Code 900 FMI 12 is Inactive, Go to Step V

  • If Fault Code 900 FMI 13 is Active, refer to OEM and enable PTO 1 Request message (SPN 3452). Go to Step V

  • If Fault Code 900 FMI 13 is Inactive, PTO 1 is properly configured. Go to Step V

  • If Fault Code 900 FMI 14, 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 900 FMI 14, 31 is Inactive, Go to Step V

F
Purpose:Verify PTO 1 configuration with ServiceRanger.

  1. Key on.

  2. Connect ServiceRanger.

  3. Go To “Configuration”.

  4. Select “PTO”.

  5. Record "PTO 1" Current Value.

  • If “PTO 1” Current Value indicates “Disabled” and a PTO is properly installed and wired, select a “Hardwire Control Only” option and follow on-screen prompts. Go to Step V

  • If “PTO 1” Current Value indicates a “Hardwire Control Only” option and a PTO is properly installed and wired, Go to Step G

G
Purpose:Verify Input/Output Package type with ServiceRanger.

  1. Key on with engine off.

  2. Connect ServiceRanger.

  3. Go To “Configuration”.

  4. Select “Calibrations” tab.

  5. Record "PTO 1" 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 PTO 1 Request circuit. Go to Step V

    Note: PTO and circuit wiring are installed by OEM or body builder.

Fault Code 900: PTO 1 Request
Package # and Description20-Way TCM Body Connector Pin(s)Component(s)
Input / Output Calibration Package 1 in TRIG2630: Neutral Output + PTO 1 + Reverse Output1415PTO1 Request Switch DPST
Input / Output Calibration Package 4 in TRIG2630: PTO 11415
Input / Output Calibration Package 5 in TRIG2630: PTO 1 + PTO 2515
Input / Output Calibration Package 6 in TRIG2630: PTO 1 + Secondary Shift Mode1415
Input / Output Calibration Package 7 in TRIG2630: PTO 1 + Rock Free Mode + Secondary Shift Mode1415
Input / Output Calibration Package 8 in TRIG2630: PTO 1 + Reverse Output + Rock Free Mode1415
Input / Output Calibration Package 11 in TRIG2630: PTO 1 + Reverse Output1415
Input / Output Calibration Package 22 and 25 in TRIG2630: Force Neutral + PTO 1 and Hold Neutral + PTO 11415
Input / Output Calibration Package 23 and 26 in TRIG2630: PTO 1 + PTO 2 + Force Neutral and Hold Neutral + PTO 1 + PTO 2515
Input / Output Calibration Package 29 in TRIG2630: PTO 1 + Rock Free Mode1415
Input / Output Calibration Package 34 in TRIG2630: PTO 1 + PTO 2 + Reverse Output 515
V
Purpose:Verify repair.

  1. Key off.

  2. Reconnect all connectors and verify all components are properly installed.

  3. Key on with engine off.

  4. Connect ServiceRanger.

  5. Go To “Fault Codes”.

  6. Select “Clear All Faults”.

  7. Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.

  8. Check for fault codes using ServiceRanger.