Fault Code 577: Rail A Aft Solenoid (A2)
J1939: SA 3 SPN 5908 FMI 0, 1, 3, 4, 5, 6, 8, 12, 16, 18
Overview
The Endurant XD Series transmissions are equipped with solenoid valves that direct vehicle Supply Air to and from the shift rail cylinders in the Mechatronic Transmission Module (MTM). Movement of each shift rail is controlled 2 solenoids; a Fore and a Aft.
The Rail A Aft Solenoid (RAAS) valve is energized by the Transmission Control Module (TCM) to direct Supply Air to the Shift Rail A Cylinder to move the Rail A Shift Yoke and Rail A Synchronizer in the aft or rearward direction. The RAAS valve is located in the MTM and connected to the TCM at the 74-Way Transmission Harness Connector.
Detection
The TCM monitors the RAAS circuit and Shift Rail A position. If a system failure is detected, the fault is set Active.
Conditions to Set Fault Code Active
FMI 0 – Data Valid But Above Normal (Most Severe): RAAS Low-Side Current value greater than commanded current for 1 second.
FMI 1 – Data Valid But Below Normal (Most Severe): RAAS Low-Side Current value less than commanded current for 1 second.
FMI 3 – Voltage Above Normal or Shorted High: RAAS circuit shorted to power for 2 seconds after RAAS commanded off.
FMI 4 – Voltage Below Normal or Shorted Low: RAAS circuit shorted to ground for 2 seconds after RAAS commanded off.
FMI 5 – Current Below Normal or Open Circuit: RAAS circuit open for 2 seconds after RAAS commanded off.
FMI 6 – Current Above Normal or Shorted Circuit: RAAS circuit shorted to ground for 2 seconds after RAAS commanded on.
FMI 8 – Abnormal Frequency: RAAS signal frequency out of range for 1 second.
FMI 12 – Bad Intelligent Device: TCM has detected an internal processing error.
FMI 16 – Data Valid but Above Normal (Moderately Severe): RAAS commanded on longer than expected increasing solenoid temperature.
FMI 18 – Data Valid but Below Normal (Moderately Severe): RAAS circuit voltage lower than expected for 1 second after RAAS commanded on.
Fallback
FMI 0, 1, 3, 5, 6, 8, 12, 18:
- Amber warning lamp on
- If Main Drive Gear is disengaged
- Shift Rail A movement prohibited
- If Main Drive Gear is engaged
- Shift Rail A movement in aft direction prohibited
FMI 4:
- Amber warning lamp on
- Shift Rail A movement prohibited
- Shift Rail B movement prohibited
FMI 16:
- Amber warning lamp on
- Shift Rail A movement in aft direction prohibited
Conditions to Set Fault Code Inactive
FMI 0, 1, 6, 8, 12, 16, 18: Key cycle and fault condition no longer exist.
FMI 3: RAAS circuit not shorted to power for 10 seconds.
FMI 4: RAAS circuit not shorted to ground for 10 seconds.
FMI 5: RAAS circuit not open for 10 seconds.
Possible Causes
FMI 0, 1, 3, 4, 5, 6, 8, 16, 18:
- MTM - RAAS
- Internal failure
- Damaged
- MTM - Transmission Harness
- Wiring shorted to power, shorted to ground or open
- TCM
- Internal failure
FMI 12:
- TCM
- Software issue
- Internal failure
Additional Tools
- Endurant XD Service Manual TRSM0960
- Eaton Breakout Box with 74-Way Eaton Diagnostic Adapter - RR1029TR
- Digital Volt/Ohm Meter (DVOM)
Component Identification
 |
1. Transmission Control Module (TCM) Cover 2. Transmission Control Module (TCM) 3. 74-Way Transmission Harness Connector (TCM-side) 4. 74-Way Transmission Harness Connector (MTM-side) 5. Transmission Control Module (TCM) Seal 6. Mechatronic Transmission Module (MTM) |
Fault Code 577 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 577 FMI 0, 1, 3, 4, 5, 6, 8, 16, 18 is Active or Inactive, Go to Step B
If Fault Code 577 FMI 12 is Active or Inactive, Contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information. Go to Step V
Key off.
Remove TCM from MTM with 20-Way TCM Vehicle Harness Connector and 20-Way TCM Body Harness Connector connected.
Inspect TCM side of the 74-Way Transmission Harness Connector, verify connector is free from contamination and corrosion; terminals are not bent, spread or loose; and there is no damage to connector body.
Inspect TCM Seal, verify seal is properly installed and not damaged.
If contamination or damage is found, replace Transmission Control Module (TCM) and Mechatronic Transmission Module (MTM). Go to Step V
Note: MTM removal and installation requires transmission be removed from vehicle. Reference Endurant XD Service Manual TRSM0960, Transmission Removal Service Procedure.
If no contamination or damage is found, Go to Step C
Key off.
Connect Eaton Breakout Box with 74-Way Eaton Diagnostic Adapter to MTM side of 74-Way Transmission Harness Connector.
Measure resistance at Eaton Breakout Box between Pin 48 and Pin 49. Record reading in table.
Measure resistance at Eaton Breakout Box between Pin 48 and Ground (TCM mounting stud). Record reading in table.
Compare reading(s) in table.
If readings are in range, Go to Step D
If readings are out of range, replace Mechatronic Transmission Module (MTM). Go to Step V
Note: MTM removal and installation requires transmission be removed from vehicle. Reference Endurant XD Service Manual TRSM0960, Transmission Removal Service Procedure.
| Pins | Range | Reading(s) |
|---|---|---|
| 48 to 49 | 3.4–5.5 Ohms | |
| 48 to ground (TCM mounting stud) | Open Circuit (OL) |
Key off.
Remove Eaton Breakout Box 74-Way Eaton Diagnostic Adapter.
Reinstall TCM to MTM.
Reconnect all connectors and verify all components are properly installed.
Key on with engine off.
Connect ServiceRanger.
Retrieve and record transmission fault codes, FMIs, occurrences, and timestamps.
If Fault Code 577 FMI 0, 1, 3, 4, 5, 6, 8, 16, 18 is Active, replace Transmission Control Module (TCM). Go to Step V
If Fault Code 577 FMI 0, 1, 3, 4, 5, 6, 8, 16, 18 is Inactive, replace Mechatronic Transmission Module (MTM). Go to Step V
Note: MTM removal and installation requires transmission be removed from vehicle. Reference Endurant XD Service Manual TRSM0960, Transmission Removal Service Procedure.
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 577 sets Active, Go to Step A
If a fault code other than 577 sets Active, troubleshoot per the Fault Code Isolation Procedure Index.