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Home >> VinFast >> 2023 >> VF9 Eco >> Repair and Diagnosis (Single Page) >> Steering >> Electronic Steering >> Power Steering System Diagnosis (2 Of 2) >> DTC U3000-96: Control Module - Component Internal failure >> VinFast DTC Guided Repair Instruction >> Operating Conditions
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Operating Conditions

Enable Criteria For all 10 cases:
AND Battery voltage is between 9V to 16V
AND Ignition On
  1. No Level A DTC

    AND After EPS assist power Ramp Up

  2. No Level A DTC

    AND GATE Driver is normal

  3. No Level A DTC
  4. No Level A DTC
  5. N/A
  6. N/A
  7. N/A
  8. N/A
  9. AND After Ramp Up
Failure Criteria
  1. Steering Wheel counter calculated by Motor position is turned Over 40 rotations to one direction.
  2. Detected failure by gate driver
  3. MCU Hardware Failures handled by SMU (Safety Management Unit) Peripheral; e.g lock step error, access protection violation, Flash ECC, RAM ECC, DFLASH ECC etc
  4. The POK 5V flag from regulator is monitored, if regulator has fault, it will set LOW.
  5. |Vbat - Vbridge|is greater than 2V
  6. If power on at different timing, arbitration error will occur when system init.
  7. ECU fail-safe RELAY Short (When GateDriver Power Switch Driver Off + Monitoring ON)
  8. ECU fail-safe RELAY Open (When GateDriver Power Switch Driver ON + Monitoring OFF)

    *monitoring ON: power switch line in EPS circuit is on (electric current is flow), but software RELAY command is off.

    *monitoring OFF: power switch line in EPS circuit is Off (electric current is not flow), but software RELAY command is on.

  9. Detect error of NVM.

    Every time read/write access is performed, if there MPU (Memory Protection Unit) error a trap/exception is raised; stuck in the endless while loop.

    Types of Failures: privilege instruction check, Read/write execution, peripheral access, null address and global register write protection

  10. Internal temperature Sensor value less than -50° OR greater than 150°
Failure/Mature Time
  1. 50 ms
  2. 32 ms
  3. Immediately
  4. 24 ms
  5. 500 ms
  6. 3000 ms
  7. 80 ms
  8. 80 ms
  9. Immediately
  10. 3000 ms
Pass Criteria
  1. Steering Wheel counter calculated by Motor position is turned under 40 rotations to one direction
  2. Gate driver is valid
  3. MCU hardware is valid
  4. regulator is valid voltage
  5. |Battery voltage - Bridge Voltage| less than or equal to 2V
  6. ECU1 and ECU2 have power on in same time.
  7. ECU fail-safe RELAY has no detection of Short or Open circuit
  8. ECU fail-safe RELAY has no detection of Short or Open circuit
  9. No error detected in the Non Volatile Memory when reading/writing to it.
  10. -50° less than or equal to Temperature Sensor value is less than or equal to 150°
Pass/De-mature Time Immediately
Failure Aging 40 Ignition cycles
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