Alerts
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| Signal Name | Description | Condition | Impact |
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Torque sensor 1 signal invalid
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Invalid Torque sensor 1 signal received by EPAS
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Steering assist reduced and EAC inhibited
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Torque sensor 1 signal not received
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Torque Sensor 1 signal not received by EPAS
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Steering assist reduced and EAC inhibited
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x19 is a diagnostic overview register, registers 1A to 1E provides additional granularity for EPAS digital current sensor (DCS) fault concerns
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Any bit is set from the EPAS DCS x19 register
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This alert is primarily informational and is used for logging purposes. No expected impact on vehicle functionality.
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Electronic Power Assist Steering (EPAS) digital current sensor (DCS) register CREGx or CTUBx voltage less than expected
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Internal digital current sensor (DCS) CBoot flag is set
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This alert is primarily informational and is used for logging purposes. No expected impact on vehicle functionality.
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Phase PWM feedback control error
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Phase PWM feedback control error
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Reduced steering assist
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Electric Power Assisted Steering (EPAS) reports unexpected error between internal angle sensor and steering column control module (SCCM) angle sensor.
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The steering system detects divergence between its internal angle sensor and external angle sensor greater than 30 degrees.
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Angle measurement divergence could indicate steering system belt slip or other mechanical failure.
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Electric Power Assisted Steering (EPAS) reports its secondary Electronic Control Unit (ECU) activated External Angle Control (EAC).
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The EPAS secondary ECU activates EAC due to a condition affecting the primary ECU.
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Backup EAC is active due to a detected condition on the primary steering ECU.
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Electric Power Assisted Steering (EPAS) reports that power steering is unavailable for the remainder of the current power cycle.
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EPAS monitor detects a condition affecting EPAS and disables power steering.
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Power steering is unavailable for the remainder of the current drive cycle.
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Gate drive SPI communication error
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Gate drive SPI communication errors
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Reduced steering assist
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Controller Area Network (CAN) message received from the vehicle security controller (VCSEC) electronic control unit (ECU) has an invalid counter value, indicating an error in data integrity has been detected.
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CAN message counter received from the VCSEC ECU does not increment as expected.
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The VCSEC to Electronic Power-Assisted Steering (EPAS) interface is interrupted. Tire-based steering tuning may be affected.
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Controller Area Network (CAN) messages received from the vehicle security controller (VCSEC) electronic control unit (ECU) has an invalid checksum value, indicating an error in data integrity has been detected.
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CAN message received from the VCSEC ECU has an invalid checksum value.
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The VCSEC to Electronic Power-Assisted Steering (EPAS) interface is interrupted. Tire-based steering tuning may be affected.
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DI_speed - backup vehicle speed - message not received.
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Electronic Power Assist Steering (EPAS) does not receive DI_speed on CAN as expected
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The power steering is operational but the level of assist is decreased and External Angle Controller is inhibited.
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Electric Power Assisted Steering (EPAS) reports that power steering is unavailable for the remainder of the current power cycle.
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EPAS monitor detects a condition affecting EPAS and disables power steering.
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Power steering is unavailable for the remainder of the current drive cycle.
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Electric Power Assisted Steering (EPAS) reports its secondary Electronic Control Unit (ECU) activated External Angle Control (EAC).
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The EPAS secondary ECU activates EAC due to a condition affecting the primary ECU.
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Backup EAC is active due to a detected condition on the primary steering ECU.
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Invalid DI_speedCounter value received
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DI_speedCounter is not incrementing correctly
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Electronic Power Assist Steering (EPAS) will use V_max reduced assist level if invalid DI_speed message received
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Invalid DI_speedChecksum value received
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Unexpected DI_speedChecksum value received by EPAS
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Electronic Power Assist Steering (EPAS) will use V_max reduced assist level if invalid DI_speed message received
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Electronic Power Assist Steering (EPAS) transition to DI vehicle speed source
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ESP_wheelRotation missing or degraded ESP_wheelSpeedQF or degraded DI_speed backup vehicle speed message
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Electronic Power Assist Steering (EPAS) is in reduced assist state, EAC is inhibited
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Electronic Power Assist Steering (EPAS) maximum vehicle speed assist applied
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DI vehicle speed QF degraded below acceptable state
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Electronic Power Assist Steering (EPAS) assist at max vehicle speed level
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Current sensor in backup measurement mode
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Current sensor switched to backup measurement due to low printed circuit board (PCB) temperature & serial number
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Electronic Power Assist Steering (EPAS) current sense module in backup measurement mode
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Significant main current sensor path offset detected
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Electronic Power Assist Steering (EPAS) detected a significant offset in calculated main current sensor path output
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Steering feel potentially compromised
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