Endurant HD
TRTS0950 EN-US
|
September 2024 - B

Fault Code 963: Force Hold Neutral Input

J1939: SA 3 SPN 7695 FMI 5, 8, 9, 12, 13, 14, 19, 20

Overview

The Endurant HD transmission incorporates a Force Neutral and a Hold Neutral feature that allow the use of a separate vehicle integrated switch “input” circuit to place and hold the transmission in a neutral state to prevent vehicle motion while a vehicle specific feature is performed or chassis mounted equipment is operated or deployed (e.g. PTO, Crane, Lift, etc.). When Force Neutral or Hold Neutral is active, an “HN” is displayed in the gear display. The Transmission Control Module (TCM) can be configured to enable Force Neutral (Force Neutral - TCM Hardwired) or Hold Neutral (Hold Neutral - TCM Hardwired) based on the vehicle’s application.

When Force Neutral or Hold Neutral operation is required, the TCM receives the operator’s request (Input) from the vehicle integrated switch circuit, determines if operating conditions are suitable, then places the transmission in a neutral state regardless of the selected gear lever position (Shift Mode). The transmission remains in a neutral state and disallows any operator Shift Mode requests until the operator removes the Force Neutral or Hold Neutral request by returning the vehicle integrated switch circuit to the deactivated state and selecting Neutral on the Driver Interface Device. Reference Endurant HD Driver Instructions based on transmission model (TRDR0950/TRDR0955) for Force Neutral and Hold Neutral operation.

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 these vocational features. The Force Neutral and Hold Neutral circuits are connected to the TCM in the 20-Way TCM Body Harness Connector. The Force Neutral and Hold Neutral circuits are installed by the OEM or body builder. Reference Input / Output Calibration of the Appendix for recommended Force Neutral and Hold Neutral circuit wiring diagrams.

Detection

The TCM monitors the hardwired Force Hold Neutral Input circuit signal. If the signal is out of range, the fault is set Active.

Conditions to Set Fault Code Active

FMI 5 – Current Below Normal or Open Circuit: Force Hold Neutral Input circuit open for 5 seconds.

FMI 8 – Abnormal Frequency: Force Hold Neutral Input circuit signal frequency out of range for 1 second.

FMI 9 – Abnormal Update Rate: Force Hold Neutral Input message not received for 5 seconds.

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

FMI 13 – Out of Calibration: Force Hold Neutral Input message not available for 5 seconds.

FMI 14 – Special Instructions: Force Hold Neutral Input circuit type not configured in TCM but circuit is installed or J1939 message is received.

FMI 19 – Received Network Data in Error: Force Hold Neutral Input message invalid for 5 seconds.

FMI 20 – Data Drifted High: Force Hold Neutral Input circuit input signal out of range (4.00-5.25 V) for 5 seconds.

Fallback

FMI 5, 8, 9, 12, 13, 19, 20:

  • Amber warning lamp on
  • No degrade modes
  • Force Hold/Neutral Mode will not function

FMI 14:

  • Amber warning lamp on
    • Coast Mode and Neutral Coast prohibited
    • Urge to Move and Creep Mode prohibited
    • Inertia Brake activation prohibited
    • Upshifts prohibited
    • Clutch engagements prohibited
    • Non-Neutral modes prohibited
    • PTO Mode prohibited

Conditions to Set Fault Code Inactive

FMI 5, 8, 12, 14, 20: Key cycle and fault condition no longer exists.

FMI 9, 13, 19: Force Hold Neutral Input messages received and valid for 10 seconds.

Possible Causes

FMI 5:

  • Vehicle Harness - Force Hold Neutral Input Circuit
    • Open circuit

FMI 8:

  • Vehicle Harness - Force Hold Neutral Input Circuit
    • Shorted to power, shorted to ground, or open circuit

FMI 9, 13, 19:

  • Vehicle Components - Vehicle ECU(s)
    • Force Hold Neutral Input 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:

  • TCM
    • Not configured for Force Hold Neutral Input circuit type installed

FMI 20:

  • Vehicle Harness - Force Hold Neutral Input Circuit
    • Shorted to power, shorted to ground or open circuit

Fault Code 963 Troubleshooting

A
Purpose:Check for Active or Inactive fault codes.

  1. Set vehicle parking brake and chock wheels.

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

  • If Fault Code 963 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V

  • If Fault Code 963 FMI 5, 8, 14 or 20 is Active, Go to Step B

  • If Fault Code 963 FMI 5, 8, 14 or 20 is Inactive, the intermittent nature of the fault makes it likely that the problem is in the Force Hold Neutral Input circuit. Go to Step C

    Note: Force Hold Neutral Input circuit wiring is installed by OEM or body builder

  • If Fault Code 963 FMI 9 or 19 is Active or Inactive, refer to OEM guidelines for repair of the vehicle Force Hold Neutral Input message (SPN 7695). Go to Step V

  • If Fault Code 963 FMI 12 is Active, replace Transmission Control Module (TCM). Go to Step V

  • If Fault Code 963 FMI 12 is Inactive, Go to Step V

  • If Fault Code 963 FMI 13 is Active, refer to OEM and enable Force Hold Neutral Input message (SPN 7695). Go to Step V

  • If Fault Code 963 FMI 13 is Inactive, Force Hold Neutral Input is properly configured. Go to Step V

B
Purpose:Verify Force/Hold Neutral Control configuration with ServiceRanger.

  1. Key on.

  2. Connect ServiceRanger.

  3. Go To “Configuration”.

  4. Select “Options”.

  5. Record "Force/Hold Neutral Control" Current Value.

  • If "Force/Hold Neutral Control" Current Value indicates “Disabled” and Force Hold Neutral Input switch or signal circuit is properly installed and wired, select “Force Neutral - TCM Hardwired" or "Hold Neutral - TCM Hardwired" and follow on-screen prompts. Go to Step V

  • If "Force/Hold Neutral Control" Current Value indicates “Enabled” and Force Hold Neutral Input circuit is properly installed and wired, Go to Step C

C
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 Force Hold Neutral Output signal circuit. Go to Step V

    Note: Force Hold Neutral Output signal circuit wiring is installed by OEM or body builder.

Fault Code 963: Force Hold Neutral Input
Package # and Description20-Way TCM Body Connector Pin(s)Component(s)
Input / Output Calibration Package 14 and 15: Force Neutral and Hold Neutral517Force or Hold Neutral Switch
Input / Output Calibration Package 22 and 25: Force Neutral + PTO 1 and Hold Neutral + PTO 1517
Input / Output Calibration Package 23 and 26: PTO 1 + PTO 2 + Force Neutral and Hold Neutral + PTO 1 + PTO 21417
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.