DI_a204 — Vdc Rcm Longitudinal

Full alert identifier: DI_a204_vdcRcmLongitudinal

Alert description

Drive Inverter Warning: Longitudinal acceleration or roll rate error

Potential impact

Traction control and stability control may be unavailable due to this error. The vehicle should be driven with extreme caution if these features are unavailable.

Set condition

The drive inverter is not receiving longitudinal acceleration and/or roll rate from the Restraint Control Module (RCM) properly, or their values are considered implausible. Alert log signal data for longAccel and rollRate should provide more information on the specific cause (frozen signal, signal rate limit exceeded, or CAN issue). Frozen signals or rate limits require further investigation. CAN issues should also be diagnosed and can be caused by RCM not being on the PARTY CAN bus, or by general CAN bus error frames or shorts.

Clear condition

If this alert is set due to rate or freeze check, it will clear on the next drive cycle. If the alert is set due to CAN issues it will clear on the drive cycle after the CAN issues have been resolved.

Signals to check

These diagnostic fields are associated with DI_a204. Check the alert's Alert Log in Service Mode Plus for available values.

Signal	Unit
Long Accel `DI_a204_longAccel` 0 VALID 1 RANGE 2 FREEZE 3 RATE 4 QF 5 CAN 6 QF VALIDITY 7 TEMP QF INVALID	—
Long Accel Curr Val `DI_a204_longAccelCurrVal`	m/s^2
Long Accel Last Val `DI_a204_longAccelLastVal`	m/s^2
Roll Rate `DI_a204_rollRate` 0 VALID 1 RANGE 2 FREEZE 3 RATE 4 QF 5 CAN 6 QF VALIDITY 7 TEMP QF INVALID	—
Roll Rate Curr Val `DI_a204_rollRateCurrVal`	rad/s
Roll Rate Last Val `DI_a204_rollRateLastVal`	rad/s

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of DI_a204.