Endurant HD
TRTS0950 EN-US
|
September 2024 - B

Fault Code 920: PTO 1 Confirm

J1939: SA 3 SPN 3460 FMI 4, 7, 9, 12, 13, 14, 19, 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 Confirm J1939 messages or the hardwired PTO 1 Confirm 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 Confirm circuit output signal shorted to ground for 5 seconds.

FMI 7 – Mechanical System Not Responding: PTO 1 Confirm message or signal received but PTO 1 Engage not commanded.

FMI 9 – Abnormal Update Rate: PTO 1 Confirm 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 Confirm 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: PTO 1 Confirm messages invalid 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 Confirm circuit not shorted to ground for 10 seconds.

FMI 7: PTO 1 Confirm circuit signal not continuously grounded.

FMI 9, 13, 19: PTO 1 Confirm messages received and valid for 10 seconds.

FMI 12: Key cycle and fault condition no longer exits.

FMI 14, 31: Valid I/O Package calibration file is configured in TCM.

Possible Causes

FMI 4:

  • Vehicle Harness - PTO 1 Confirm Circuit
    • Shorted to ground

FMI 7:

  • Vehicle Harness - PTO 1 Confirm Circuit
    • Shorted to ground
  • Vehicle Components - PTO 1 Confirm Circuit
    • Switch stuck open
    • Relay latch failure
  • Vehicle Components - PTO Mechanical
    • Failure to engage

FMI 9, 13, 19:

  • Vehicle Components - Vehicle ECU(s)
    • PTO 1 Confirm 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
    • Internal failure
    • Software issue

FMI 14, 31:

  • TCM
    • Invalid I/O Package calibration file configured in TCM

Fault Code 920 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.

  • If Fault Code 920 FMI 4 is Active or Inactive, Go to Step C

  • If Fault Code 920 FMI 7 is Active or Inactive, Go to Step E

  • If Fault Code 920 FMI 9, 13, 19 is Active, Go to Step D

  • If Fault Code 920 FMI 9, 13, 19 is Inactive, PTO 1 is properly configured and communicating valid PTO messages in the TCM and OEM ECU. Go to Step V.

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” Confirm switch or circuit. 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 settings. 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:Verify PTO 1 operation and Confirm feedback.

  1. Key on with engine running.

  2. Select transmission PTO 1 request switch to off (if necessary).

  3. Connect ServiceRanger.

  4. Go To “Data Monitor”

  5. From the “Default Parameter Files” tab, select “Transmission PTO”.

  6. Monitor 520536 – PTO Confirmation Voltage value. Record reading in table.

  7. Select transmission PTO 1 request switch to on.

  8. Monitor 520536 – PTO Confirmation Voltage value. Record reading in table.

  9. Compare reading(s) in table.

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

  • If readings are in range, no fault was found. The intermittent nature of the fault makes it likely that the problem is in the PTO, PTO 1 confirmation switch and/or wiring. Refer to OEM or body builder guidelines for repair or replacement.Go to Step V

  • If readings are out of range, refer to OEM or body builder guidelines for repair or replacement of the PTO, PTO 1 confirmation switch and/or wiring.Go to Step V

ParameterRangeReading(s)
PTO 1 Off
520536 – PTO Confirmation Voltage4.5–5.5 V
PTO 1 On
520536 – PTO Confirmation Voltage0.0–0.5 V
F
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 920 FMI 4 or 7 is Active or Inactive, Go to Step G

  • If Fault Code 920 FMI 9 or 19 is Active or Inactive, refer to OEM guidelines for repair of the vehicle PTO 1 Confirm message (SPN 3460). Go to Step V

  • If Fault Code 920 FMI 12 is Active, replace Transmission Control Module (TCM). Go to Step V

  • If Fault Code 920 FMI 12 is Inactive, Go to Step V

  • If Fault Code 920 FMI 13 is Active, refer to OEM and enable PTO 1 Confirm message (SPN 3460). Go to Step V

  • If Fault Code 920 FMI 13 is Inactive, PTO 1 is properly configured. Go to Step V

  • If Fault Code 920 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 920 FMI 14 or 31 is Inactive, Go to Step V

G
Purpose:Verify PTO 1 operation and Confirm feedback.

  1. Key on with engine running.

  2. Select transmission PTO 1 request switch to off (if necessary).

  3. Connect ServiceRanger.

  4. Go To “Data Monitor”

  5. From the “Default Parameter Files” tab, select “Transmission PTO”.

  6. Monitor 520536 – PTO Confirmation Voltage value. Record reading in table.

  7. Select transmission PTO 1 request switch to on.

  8. Monitor 520536 – PTO Confirmation Voltage value. Record reading in table.

  9. Compare reading(s) in table.

  • If readings are in range, no fault was found. The intermittent nature of the fault makes it likely that the problem is in the PTO, PTO 1 confirmation switch and/or wiring. Go to Step H

  • If readings are out of range, Go to Step H

ParameterRangeReading(s)
PTO 1 Off
520536 – PTO Confirmation Voltage4.5–5.5 V
PTO 1 On
520536 – PTO Confirmation Voltage0.0–0.5 V
H
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 "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 PTO 1 Confirm circuit. Go to Step V

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

Fault Code 920: PTO 1 Confirm
Package # and Description20-Way TCM Body Connector Pin(s)Component(s)
Input / Output Calibration Package 1: Neutral Output + PTO 1 + Reverse Output516PTO1 Confirm Relay
Input / Output Calibration Package 4: PTO 1516
Input / Output Calibration Package 5: PTO 1 + PTO 2516
Input / Output Calibration Package 6: PTO 1 + Secondary Shift Mode516
Input / Output Calibration Package 7: PTO 1 + Rock Free Mode + Secondary Shift Mode1416
Input / Output Calibration Package 8: PTO 1 + Reverse Output + Rock Free Mode516
Input / Output Calibration Package 11: PTO 1 + Reverse Output516
Input / Output Calibration Package 22 and 25: Force Neutral + PTO 1 and Hold Neutral + PTO 11416
Input / Output Calibration Package 23 and 26: PTO 1 + PTO 2 + Force Neutral and Hold Neutral + PTO 1 + PTO 2516
Input / Output Calibration Package 29: PTO 1 + Rock Free Mode1415
Input / Output Calibration Package 34: PTO 1 + PTO 2 + Reverse Output515
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.