Alerts
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| Signal Name | Description | Condition | Impact |
|---|---|---|---|
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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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Invalid DAS_steeringControlChecksum value received.
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Unexpected DAS_steeringControlChecksum value received by EPAS
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External Angle Controller inhibited
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Invalid DAS_steeringControlCounter value received.
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DAS_steeringControlCounter is not incrementing correctly
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External Angle Controller inhibited
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DAS_steeringControl message not received.
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DAS_steeringControl message not received by EPAS
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External Angle Controller inhibited
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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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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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Electronic Power Assisted Steering (EPAS) module Overheat Protection (OHP) is active.
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OHP limit reports a value less than 140A.
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Steering assist is reduced and External Angle Control (EAC) is degraded.
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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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Vehicle speed estimation correlation error.
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|ESP_Vehicle speed - DI_axleSpeed*.12384| > 3KPH + 0.1*ESP_Vehicle speed
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Reduced assist
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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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