ITS61557 Service Bulletin/Repair Instructions

INSTRUCTION TO SERVICE

ITS61557
FEBRUARY 6, 2026
SECTION:
290-PLC Programs
SUBJECT:
#PLC# - Saucon addition to MCI coach
ISSUE:
Customer request to have PLC transmit specified signals to Saucon.
SUMMARY:
Flash Latest Released PLC Program to the Vehicle
ITS61557

Ref. NHTSA Recall No.

Not Applicable
Ref. Transport Canada Recall No.

Not Applicable
THIS ITS DOCUMENT SHOULD BE RETAINED AND REFERRED TO FOR FUTURE MAINTENANCE UNTIL

THE NEW FLYER PARTS AND/OR SERVICE MANUAL IS UPDATED TO REFLECT WORK DONE AS A

RESULT OF THIS DOCUMENT. ENSURE THAT THIS DOCUMENT IS AVAILABLE FOR PARTS AND

MAINTENANCE STAFF GOING FORWARD.

This document and the contents discussed herein are the confidential and proprietary information of New Flyer Industries Canada

ULC and New Flyer of America Inc. and are disclosed by New Flyer in confidence. This document and the contents herein are not

to be disclosed by the intended recipient without the prior written authorization of New Flyer. Any unauthorized disclosure,

reproduction or other distribution of this document or information strictly prohibited and may result in action being taken against

the party making the unauthorized disclosure. This document and all copies hereof must be returned to New Flyer upon request.
INSTRUCTION TO SERVICE

ITS61557
Section
Field Name
Input / Example
1. EXECUTIVE

SUMMARY
Document Type
Customer Request
Year and Model

Affected
Select 2025-2026 J4500 vehicles
Triggering Event
Condition is primarily triggered when the vehicle

performs an event monitored by Saucon.
2. SAFETY RISK
Safety Risk

Statement
Not Applicable
3. CORRECTIVE

ACTION
Corrective

Measure
Flash Latest Released PLC Program to the Vehicle
Issue Resolution

Statement
Issue resolved by updating logic groups as requested by

customer.
Validation Criteria
The program works as expected if the customer can see

the transmitted message via the Saucon system.
ITS61557
Page 2 of 4
FEBRUARY 6, 2026
INSTRUCTION TO SERVICE

ITS61557
PROCEDURE:

1. Set park brake and chock wheels.

2. Turn the main battery disconnect switch to the “ON” position.

3. Turn the MRS Switch to the “DAY RUN” position to turn on the bus.

4. Turn the HAZARD SWITCH to “ON”.

5. Connect the USB interface of your NEXIQ to your laptop.

6. Connect the CAN interface of your NEXIQ to Channel 1 (Pins C and D) of the Rear Vehicle Diag port.

7. Open the PLC program in the VMM software.

8. Select Tools and Query VMMs.
Figure 1: Query VMMs Option

9. Ensure you are communicating with all the nodes in the query screen prior to downloading.

10. Select download logic.

11. Ensure the correct file name and revision appear in the file window.
Figure 2: File Selection and Flashing Start
ITS61557
Page 3 of 4
FEBRUARY 6, 2026
INSTRUCTION TO SERVICE

ITS61557

12. The software will verify the correct number of VMMs are found. Do not download program if all VMMs are

not located. If the correct number of VMMs were found, select Yes.

13. Flashing will happen in two parts; the main logic and the J1939 Table data will be 2 separate progress

screens. Make sure not to close anything after the first progress screen reaches 100% as another one will

appear after that also needs to complete before flashing is completed.

14. Once flashing has truly finished, allow the bus to stay awake for 15 minutes without knifing the bus or turning

off the hazards. This ensures that the VMMs stay awake long enough to load the program into the dash with

the new PLC program. This is an important step as the dash may get stuck rebooting repeatedly if interrupted

while it is being programmed by the other VMMs. This needs to happen as the DPS70 has a slave VMM

inside of it that is not programmed as a part of the above outlined VMM flashing process.

NOTE – For a non-touchscreen bus, there is no requirement to wait 15 minutes. The bus can be turned

off immediately after a flash.

15. Remove all tools and debris from work area to return coach to service.

16. Turn the main battery disconnect switch to the “OFF” position.
LABOUR ESTIMATE

Number of

Technician(s)

1
Operation

1
Flash VMM Program
Hours
Labor Time

T X HR

0.5
0.5
SPECIAL TOOLS REQUIRED

Item
Part Number
Description
Qty.
Units
1
Laptop with Vansco VMM Software
1
EA
2
NEXIQ DLA Adaptor
1
EA
ITS61557
Page 4 of 4
Notes
FEBRUARY 6, 2026

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