Scania EMS DTC 1024 EGR content

EMS Engine Management System · Scania · 2 variants

Code 1024 (decimal). Some diagnostic tools show it in hexadecimal as 0400.

In short

Incorrect volume of EGR is being recirculated. The desired amount of EGR cannot be reached, or the measurement of the amount of EGR is not reliable.

Variant 1

Applies to: EMS S7

What does Scania EMS fault code 1024 mean?

Incorrect volume of EGR is being recirculated. The desired amount of EGR cannot be reached, or the measurement of the amount of EGR is not reliable.

What causes Scania DTC 1024?

- The EGR valve is stuck. - Leakage in the EGR circuit or in the engine intake system. - The EGR cooler is blocked. - The turbocharger nozzle ring has stuck. - Turbocharger electric motor M30 is defective. - Mass flow sensor T126 indicates an incorrect value. - Charge air pressure sensor T122 indicates an incorrect value. - Charge air temperature sensor T121 indicates an incorrect value. - Exhaust gas pressure sensor T125 indicates an incorrect value.

How does the system react?

The fault affects the engine's nitrous oxide emissions. Depending on the emission class, this may result in torque reduction, speed limitation or a warning indication. Applies only to vehicles with Euro 5: The fault code cannot be deleted when it is active.

How to fix Scania EMS fault code 1024?

  1. Start by rectifying other fault codes.
  2. Then check: The EGR valve via V107 in SDP3.
  3. If there is leakage in the EGR circuit.
  4. For trucks, there is a Check for EGR charge air leakage in SDP3.
  5. That the EGR cooler is intact and clean.
  6. The variable geometry turbocharger nozzle ring and electric motor.
  7. Carry out a Condition test in SDP3.
  8. Engine intake system.
  9. For trucks, there is a check for EGR charge air leakage.
  10. Mass flow sensor T126.
  11. Charge air pressure sensor T122.
  12. Charge air temperature sensor T121.
  13. Exhaust gas pressure sensor T125.
  14. Note: Always carry out Checking the EGR circuit to verify that the fault has been rectified when repairs have been carried out.
  15. This check is available through SDP3.
  16. Carry out a default setting and calibration of the EGR system using SDP3 as well.
  17. When the fault code is inactive, the high exhaust emissions warning lamp will go out.
  18. If the operating time since the fault code was generated exceeds 10 hours, drain the EGR cooler as there is a risk that condensed water will form in the air-cooled EGR cooler when the EGR system has been switched off.
  19. Drain according to the instructions in Workshop Manual, sub-group 01-65.

Variant 2

Applies to: EMS S8

Detection

Incorrect volume of EGR is being recirculated. The desired amount of EGR cannot be reached, or the measurement of the amount of EGR is not reliable.

Possible cause

- The EGR valve is stuck. - Leakage in the EGR circuit or in the engine intake system. - The EGR cooler is blocked. - The turbocharger nozzle ring has stuck. - Turbocharger electric motor M30 is defective. - Mass flow sensor T126 indicates an incorrect value. - Charge air pressure sensor T122 indicates an incorrect value. - Charge air temperature sensor T121 indicates an incorrect value. - Exhaust gas pressure sensor T125 indicates an incorrect value.

System reaction

The fault affects the engine's nitrous oxide emissions. Depending on the emission class, this may result in torque reduction, speed limitation or a warning indication. Applies only to vehicles with Euro 5: The fault code cannot be deleted when it is active.

How to fix

  1. Rectify other fault codes related to the EGR circuit first.
  2. Then check: The EGR valve via valve block V107.
  3. Potential leakage in the EGR circuit or in the engine intake system.
  4. Run EMS > E 44 > S8 > Check > Leak testing the EGR circuit.
  5. That the EGR cooler is intact and not clogged.
  6. The variable geometry turbocharger nozzle ring and electric motor.
  7. Run EMS > E 44 > S8 > Check > Condition test on the variable geometry turbocharger.
  8. Mass flow sensor T126.
  9. Charge air pressure sensor T122.
  10. Charge air temperature sensor T121.
  11. Exhaust gas pressure sensor T125.
  12. When the fault code is inactive, the high exhaust emissions warning light will go out.
  13. You may need to carry out a default setting of the EGR circuit.
  14. Run the wizard EMS > E44 > S8 > Calibration > Default setting and calibration of the EGR circuit.
  15. When the actions have been carried out, always check that the fault code has disappeared.
  16. Run the wizard EMS > E 44 > S8 > Check > Check the EGR circuit to verify that the fault has been rectified.
  17. Applies only to vehicles with Euro 5: If the operating time since the fault code was generated exceeds 10 hours, drain the EGR cooler.
  18. The reason for this is that there is a risk that condensed water has formed in the air-cooled EGR cooler while the EGR circuit was switched off.
  19. Drain the EGR cooler according to the instructions in the Workshop Manual > 01-65 EGR circuit > Air-cooled EGR cooler.
  20. Rectify other fault codes related to the EGR circuit first.
  21. Then check: Actuator for EGR valve M28.
  22. Potential leakage in the EGR circuit or in the engine intake system.
  23. Run EMS > E 44 > S8 > Check > Leak testing the EGR circuit.
  24. That the EGR cooler is intact and not clogged.
  25. The variable geometry turbocharger nozzle ring and electric motor.
  26. Run EMS > E 44 > S8 > Check > Condition test on the variable geometry turbocharger.
  27. Mass flow sensor T126.
  28. Charge air pressure sensor T122.
  29. Charge air temperature sensor T121.
  30. Exhaust gas pressure sensor T125.
  31. When the fault code is inactive, the high exhaust emissions warning light will go out.
  32. You may need to carry out a default setting of the EGR circuit.
  33. Run the wizard EMS > E44 > S8 > Calibration > Default setting and calibration of the EGR circuit.
  34. When the actions have been carried out, always check that the fault code has disappeared.
  35. Run the wizard EMS > E 44 > S8 > Check > Check the EGR circuit to verify that the fault has been rectified.
  36. Applies only to vehicles with Euro 5: If the operating time since the fault code was generated exceeds 10 hours, drain the EGR cooler.
  37. The reason for this is that there is a risk that condensed water has formed in the air-cooled EGR cooler while the EGR circuit was switched off.
  38. Drain the EGR cooler according to the instructions in the Workshop Manual > 01-65 EGR circuit > Air-cooled EGR cooler. | Rectify other fault codes related to the EGR circuit first.
  39. Then check: The EGR valve via valve block V107.
  40. Potential leakage in the EGR circuit or in the engine intake system.
  41. Run EMS > E 44 > S8 > Check > Leak testing the EGR circuit.
  42. That the EGR cooler is intact and not clogged.
  43. The variable geometry turbocharger nozzle ring and electric motor.
  44. Run EMS > E 44 > S8 > Check > Condition test on the variable geometry turbocharger.
  45. Mass flow sensor T126.
  46. Charge air pressure sensor T122.
  47. Charge air temperature sensor T121.
  48. Exhaust gas pressure sensor T125.
  49. When the fault code is inactive, the high exhaust emissions warning light will go out.
  50. You may need to carry out a default setting of the EGR circuit.
  51. Run the wizard EMS > E44 > S8 > Calibration > Default setting and calibration of the EGR circuit.
  52. When the actions have been carried out, always check that the fault code has disappeared.
  53. Run the wizard EMS > E 44 > S8 > Check > Check the EGR circuit to verify that the fault has been rectified.
  54. Applies only to vehicles with Euro 5: If the operating time since the fault code was generated exceeds 10 hours, drain the EGR cooler.
  55. The reason for this is that there is a risk that condensed water has formed in the air-cooled EGR cooler while the EGR circuit was switched off.
  56. Drain the EGR cooler according to the instructions in the Workshop Manual > 01-65 EGR circuit > Air-cooled EGR cooler. | First rectify other fault codes related to the EGR circuit.
  57. Then check: Actuator for EGR valve M28.
  58. Potential leakage in the EGR circuit or in the engine intake system.
  59. Run EMS > E 44 > S8 > Check > Leak testing the EGR circuit.
  60. That the EGR cooler is intact and not blocked.
  61. Variable geometry turbocharger nozzle ring and electric motor.
  62. Run EMS > E 44 > S8 > Check > Condition test on the variable geometry turbocharger.
  63. Mass flow sensor T126.
  64. Charge air pressure sensor T122.
  65. Charge air temperature sensor T121.
  66. Exhaust gas pressure sensor T125.
  67. When the fault code is inactive, the high exhaust emissions warning lamp will go out.
  68. You may need to make a default setting of the EGR circuit.
  69. Run the wizard EMS > E 44 > S8 > Calibration > Default setting and calibration of the EGR circuit.
  70. When the actions have been carried out, always check that the fault code has disappeared.
  71. Run the wizard EMS > E 44 > S8 > Check > Checking the EGR circuit to verify that the fault has been rectified.
  72. Applies only to vehicles with Euro 5: If the operating time since the fault code was generated exceeds 10 hours, drain the EGR cooler.
  73. The reason for this is that there is a risk that condensed water has formed in the air-cooled EGR cooler when the EGR system was switched off.
  74. Drain the EGR cooler according to the instructions in the Workshop Manual > 01-65 EGR circuit > Air-cooled EGR cooler.

This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.

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