Alerts
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| Signal Name | Description | Condition | Impact |
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The Electronic Power Assist Steering (EPAS) electronic control unit (ECU) receives invalid controller area network (CAN) messages from the Restraint Control Module (RCM) on the CAN bus.
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The Electronic Power Assist Steering (EPAS) ECU receives invalid CAN messages from the RCM on the CAN bus.
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Steering assist may be reduced or may not function as expected.
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The Electric Power Assist Steering (EPAS) electronic control unit (ECU) is not receiving the expected controller area network (CAN) messages from the Restraint Control Module (RCM) on the CAN bus.
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The Electronic Power Assist Steering (EPAS) ECU does not receive the expected CAN messages from the RCM on the CAN bus.
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Steering assist may be reduced or may not function as expected. Since External Angle Control (EAC) requests may be rejected, Autopilot features may be unavailable or may not function as expected.
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The electric power assist steering (EPAS) Electronic Control Unit (ECU) is not receiving the wheel rotation message, resulting in a reduced amount of steering assist to preserve vehicle stability.
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The electric power assist steering (EPAS) Electronic Control Unit (ECU) does not receive the wheel rotation message.
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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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The electric power assist steering (EPAS) Electronic Control Unit (ECU) is not receiving the wheel speeds message, resulting in a reduced amount of steering assist to preserve vehicle stability.
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The electric power assist steering (EPAS) Electronic Control Unit (ECU) does not receive the wheel speeds message.
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The power steering is operational but the level of assist is decreased.
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The Electronic Power Assist Steering (EPAS) electronic control unit (ECU) detects that the controller area network (CAN) bus is off.
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The Electronic Power Assist Steering (EPAS) ECU detects that the CAN transmit error counter is above 255.
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Steering assist may be reduced or may not function as expected. Since External Angle Control (EAC) requests may be rejected, Autopilot features may be unavailable or may not function as expected.
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Invalid EPAS3P/S_statusCounter value received
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EPAS3P/S_statusCounter is not incrementing correctly
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Incorrect EPS status on bus
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Mismatch between primary and secondary ECU application cyclic redundancy check
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Primary and Secondary ECU are running different versions
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Reduced steering assist
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Invalid motor rotation direction
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Powerpack Polarity service not performed or incorrect value stored
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Reduced steering assist
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Invalid motor cogging compensation values
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Cogging torque service is not performed or incorrect value is stored
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Leads to torque ripple
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Power-up arbitation between primary and secondary ECU failed
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Master and Slave ECUs INIT Arbitration Failed
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Reduced steering assist and EAC inhibited
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Backup ECU motor current measurement plausibility error
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Backup ECU motor current measurement plausibility error
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Reduced steering assist
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Phase disconnect FET startup check error
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Phase disconnect FET startup check error
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Reduced steering assist
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High-side FET startup check error
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High-side FET startup check error
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Reduced steering assist
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ECU temperature sensor out of range
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Temperature sensor value is not within limit (-50 deg ~ 125 deg)
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Reduced steering assist and EAC inhibited
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Fault signaling protocol gate driver power cut
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Gate Drive PWR status signal is monitored wrto the FSP /SMU signal set to LOW). If they do not agree fault is set
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Reduced steering assist and EAC inhibited
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Estimated motor parameters exceed expected values
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if Ke < 24.6 or > 25.6mV/(rad/s), Ke=25.1mV/(rad/s)
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Leads to Torque Ripple
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Motor control feed-forward correlation error
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| estimated torque (back calculated from PWM duty & observer) - Command torque | > 1.2Nm
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Reduced steering assist and EAC inhibited
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Hands-on detection controller correlation error
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HOD level in path1 is not the same as path2
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EAC inhibited
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External angle controller correlation error
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|torque command path1 - path2| > 0.1Nm
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EAC inhibited
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Hysteresis controller correlation error
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|torque command path1 - path2| > 0.6Nm
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Reduced steering assist
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