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Home >> Land Rover >> 2021 >> Range Rover SVAutobiography Dynamic Blk. >> Repair and Diagnosis >> Steering >> Power Steering >> Steering System - General Information -- Range Rover/L405 >> Steering System - General Information >> Diagnosis And Testing >> Steering System (G2894392) >> DTC B1304-04: Electronic Power Assisted Steering System - System Internal Failures >> Action

DTC B1304-04: Electronic Power Assisted Steering System - System Internal Failures: Action

NOTE: When the repair is complete, clear the DTC  (s), close the session and then upload the session file to JLR  . Failure to follow this instruction may result in a warranty claim becoming invalid.
  1. NOTE: During this step, make sure that the battery support unit is NOT  connected.

    Using the JLR  approved diagnostic equipment, check Live Data - Main ECU Voltage Supply  (0xDD02) - Vehicle Battery Voltage  (0x402A). When the vehicle is stationary, move the steering from lock to lock in 2 seconds, immediately within 10 seconds from engine crank. If the main PSCM  voltage drops below 8.0 volts during the steering test, then install a new battery. Refer to: BATTERY .

  2. Check the battery system. REFER to: BATTERY .
  3. Check the PSCM  power and ground electrical circuits. GO to Pinpoint Test B. 
  4. Using the JLR  approved diagnostic equipment, clear the DTC  (s) and retest (Road test the vehicle for at least 10 minutes with a vehicle speed greater than 20 km/h (12 mph), including a full lock to lock of the steering system). RETEST the vehicle for DTC  (s).
  5. Check the PSCM  for damage. For steering gear damage inspection see the 'Electric Power Steering Gear Inspection  ' table in this procedure.
  6. If the fault persists and the power steering warning indicator illuminates, raise a Technical Assistance (TA)
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