Fault Code 962: Force Hold Neutral Output
J1939: SA 3 SPN 7694 FMI 3, 4, 5, 13, 14
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 reveives 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 Output circuit signal. If the signal is out of range, the fault is set Active.
Conditions to Set Fault Code Active
FMI 3 – Voltage Above Normal or Shorted High: Force Hold Neutral Output circuit signal shorted to power for 5 seconds.
FMI 4 – Voltage Below Normal or Shorted Low: Force Hold Neutral Output circuit signal shorted to ground for 5 seconds.
FMI 5 – Current Below Normal or Open Circuit: Force Hold Neutral Output circuit open for 5 seconds.
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.
Fallback
All FMIs:
- Amber warning lamp on
- No degrade modes
- Force Hold/Neutral Mode may not function
Conditions to Set Fault Code Inactive
FMI 3: Force Hold Neutral Output circuit not shorted to power for 10 seconds.
FMI 4: Force Hold Neutral Output circuit not shorted to ground for 10 seconds.
FMI 5: Force Hold Neutral Output circuit not open for 10 seconds.
FMI 13, 14: Valid I/O Package calibration file is configured in TCM.
Possible Causes
FMI 3, 4, 5:
- Vehicle Harness - Force Hold Neutral Output Circuit
- Shorted to power, shorted to ground, or open circuit
FMI 13, 14:
- TCM
- Invalid I/O Package calibration file configured in TCM
Fault Code 962 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 962 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V
If Fault Code 962 FMI 3, 4 or 5 is Active, Go to Step B
If Fault Code 962 FMI 3, 4 or 5 is Inactive, the intermittent nature of the fault makes it likely that the problem is in the Force Hold Neutral Output circuit. Go to Step C
Note: Force Hold Neutral Output circuit wiring is installed by OEM or body builder.
If Fault Code 962 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 962 FMI 13 or 14 is Inactive, Go to Step V
Key on.
Connect ServiceRanger.
Go To “Configuration”.
Select “Options”.
Record "Force/Hold Neutral Control" Current Value.
If "Force/Hold Neutral Control" Current Value indicates “Disabled” and Force Hold Neutral Output 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 Output 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 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 962: Force Hold Neutral Output | |||
|---|---|---|---|
| Package # and Description | 20-Way TCM Body Connector Pin(s) | Component(s) | |
| Input / Output Calibration Package 14 and 15 in TRIG2630: Force Neutral and Hold Neutral | 1 | 17 | Force or Hold Neutral Switch |
| Input / Output Calibration Package 22 and 25 in TRIG2630: Force Neutral + PTO 1 and Hold Neutral + PTO 1 | |||
| Input / Output Calibration Package 23 and 26 in TRIG2630: PTO 1 + PTO 2 + Force Neutral and Hold Neutral + PTO 1 + PTO 2 | |||
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 962 sets Active, Go to Step A
If a fault code other than 962 sets Active, troubleshoot per the Fault Code Isolation Procedure Index.