08-001 ECPC SPN 517081/FMI 14 False Fail for
Welded Contactors BMS3 or BMS4 SPN
517000/FMI 6 or SPN 517001/FMI 6

TSB-08-001-FTL

Creation Date:2023-12-04
Last Revision Date:2024-05-20

Engine or Vehicle Affected:
pemM2
peCascadia

Description of Revisions: This bulletin replaces the version dated
04/11/2024. The service bulletin number has been added in the title.

Warranty applies to this described condition. See the warranty information at the end of this bulletin.
Described Conditi

In eCascadia and eM2 vehicles, the fault monitoring diagnostics for the AUX contactors in BMS3 or BMS4 may
trigger a false SPN517000/FMI6 or SPN517001/FMI6 due to incorrectly identifying contactors as being welded.
When a welded contactor condition is active, the high-voltage (HV) startup gets disabled. This incorrect fail
status will be rectified and corrected in a forthcoming software update. In the interim, to verify and rectify the
false fail fault, perform the following procedure when:

¢ ECPC is reporting SPN 517081/FMI 14 and
¢ BMSS3 is reporting SPN 517000/FMI 6 or SPN 517001/FMI 6 and the batteries are 2 layer batteries or

¢ BMS4 is reporting SPN 517000/FMI 6 or SPN 517001/FMI 6 and the batteries are 3 layer batteries.

4 Danger: Service and repair of the electric vehicle should only be performed by
technicians that have completed HV2 or HV3 Daimler Safety Training.
Decommissioning and commissioning of the HV system should only be
performed by technicians that have completed HV3 Daimler Safety training. To
prevent personal injury or death, or damage to the electric system, do not attempt
repairs yourself.

4 Danger: If a collision occurs, do not touch any high voltage cables, connectors,
or components. Doing so could cause severe personal injury or death.

@ Warning: Always disconnect the battery negative (ground) cable before carrying
out repairs or service on the electrical system.

@ Warning: Before attempting any work on the batteries or the electrical system,
remove all metal jewelry. If metal contacts with electrical circuits, a short circuit
may occur causing electrical system failure and damage or personal injury.

1. Park the vehicle on a level surface, place the vehicle in neutral, shut down the vehicle, and set the park brake. Chock the tires.

2. _Decommission the vehicle and verify the high-voltage (HV) system is shut down. See Section 08.08, Subject 110 of the eCascadia
Workshop Manual ot Section 08.08, Subject 110 of the eM2 Workshop Manual for instructions. Is the measurement greater than 12 volts
during decommissioning?

a. YES — Stop the decommissioning procedure. Visit the ‘DTTS Cases’ link on the service page of the DTNA Portal for additional
assistance.

b. No Go to step 3.

3. “Connect all the HV connectors and the cable clamps that were removed during the decommissioning.

4. Remove the cable retention clamp bolt at the battery 2, connector C3. See Fig. 1, item 3.

5. Remove the bolt and install the guide pin tool (DDE DSNEMG022008) on battery 2, connector C3. See Fig. 2.

6. Lift the high-voltage cable (HV) connector C3 from battery 2, remove the guide pin, then install the breakout box tool (W000588046300) on
the battery 2, connector C3.

7. Leave the E-Stop button pressed and Locked Out. Turn the cab load disconnect switch (CLDS) ON and turn the keyswitch to the ON
position,

8. “Connect 12 volts DC into the breakout box positive and EQ ground (center banana jack) ports for one minute. A 12 volt power supply or the
vehicle 12 volt battery circuit may be used.

9. Turn the keyswitch to the OFF position and turn the CLDS OFF.

10. Remove the breakout box from battery 2, connector C3.

11. “Install the guide pin tool (DDE DSNEMG022008) on battery 2, connector C3.

12. Install the high voltage cable on the battery 2, connector 3. Remove the guide pin, then install the connector C3 retention bolt and tighten
the bolt 14 Ib-ft (19 N-m).

13. Commission the vehicle. See Section 08.08, Subject 110 of the eCascadia Workshop Manual or Section 08.08, Subject 110 of the eM2
Workshop Manual or instructions.
HV battery connector callouts and Aux cable retention clamps

07/25/2023 f080501

1. Connector 1 (C1) 4. Connector 4 (C4)
2. Connector 2 (C2) 5. Connector 5 (C5)

3. Connector 3 (C3)
Fig. 1, HV battery connector callouts and Aux cable retention clamps

Guide Pin

03/27/2024 f080503
Fig. 2, Guide Pin

14. Turn the CLDS ON and tum the keyswitch to the ON position, then connect DiagnosticLink® and clear the fault codes.

15. After the faults are cleared, continue to monitor the faults for two minutes. Does the fault return active?

a. Yes — Visit the ‘DTTS Cases’ link on the service page of the DTNA Portal for additional assistance.

b. No — Return the vehicle to operation.

Warranty

This procedure is warrantable only if the described condition exists and the repair is performed within the
applicable base or extended coverage warranty period. If a failure is not found, this procedure is considered
preventive and warranty does not apply.

See Table 1 for OWL VMRS codes and labor allowance information. Enter this service bulletin number in the
Service Bulletin # field.

Table 1, OWL VMRS Codes and Labor Allowance

Primary Failed | Component Cause Correction SRT Description Hours
Part Code Code Code Code
2 layer: A66- | 039-001-001 33 24 4BL- BATTERY ASSEMBLY - HIGH 1.0
23665-000 5000A VOLTAGE ELECTRIC VEHICLE
3 layer: A66-
23670-000

Note:
039-001-001

F38,F40,F37

REMOVE INSTALL

CONTACT INFORMATION

For questions, please create a Service Technical Request using the DTTS Application on the DTNA Portal

Document Number:0000083641

Table 1, OWL VMRS Codes and Labor Allowance