USM_a120 — DI DRIVE MIA
Full alert identifier: USM_a120_DI_DRIVE_MIA
Alert description
One or more of the messages the vehicle controller receives periodically from the drive interface (DI) electronic control unit (ECU) is not received while the vehicle is in Drive, indicating the DI ECU may be unavailable (MIA).
Potential impact
Vehicle speed and power may be limited.
Set condition
One or more of the expected messages from the DI ECU is not received while the vehicle is in Drive.
Clear condition
The vehicle controller starts receiving the expected messages from the DI ECU while the vehicle is in Drive, or the vehicle is no longer in Drive.
Signals to check
These diagnostic fields are associated with USM_a120. Check the alert's Payload in Service Mode Plus for available values.
| Signal | Unit |
|---|---|
BDY Speed
USM_
|
— |
CH Chassis Cntl
USM_
|
— |
CH Loc Status 2
USM_
|
— |
CH Speed
USM_
|
— |
PARTY Aggregated Axle Speed
USM_
|
— |
PARTY Autonomy Health
USM_
|
— |
PARTY Chassis Cntl
USM_
|
— |
PARTY Loc Status
USM_
|
— |
Show 25 more fields
| Signal | Unit |
|---|---|
PARTY Loc Status 2
USM_
|
— |
PARTY Motor Status
USM_
|
— |
PARTY Prnd Control
USM_
|
— |
PARTY Speed
USM_
|
— |
PARTY Stalkless Interfaces
USM_
|
— |
PARTY Status
USM_
|
— |
PARTY System Status
USM_
|
— |
PARTY Torque
USM_
|
— |
PARTY Vehicle Estimates
USM_
|
— |
PT Speed
USM_
|
— |
PT System Power
USM_
|
— |
PT System Status
USM_
|
— |
VEH Aggregated Axle Speed
USM_
|
— |
VEH Autonomy Health
USM_
|
— |
VEH Chassis Cntl
USM_
|
— |
VEH Estimated Brake Temp
USM_
|
— |
VEH Loc Status
USM_
|
— |
VEH Loc Status 2
USM_
|
— |
VEH Motor Status
USM_
|
— |
VEH Prnd Control
USM_
|
— |
VEH Speed
USM_
|
— |
VEH System Power
USM_
|
— |
VEH System Status
USM_
|
— |
VEH Torque
USM_
|
— |
VEH Vehicle Estimates
USM_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of USM_a120.