323000509 - INTRODUCTION - DIESEL INJECTION PRESSURE PUMP ELECTRONIC CONTROL

DESCRIPTION OF COMPONENTS

Injection control unit (common rail mjd 6f3 magneti marelli)

It is located in the engine compartment.The control unit the flash EPROM type, i.e. it can be reprogrammed from the outside without affecting the hardware.The injection control unit integrates the absolute pressure sensor.PIN OUT
CONNECTOR A1. Cylinder 4 injector negative2. Not connected3. Not connected4. Fuel pressure regulator positive on the pump5. E.G.R./VGT positive6. Fuel pressure sensor negative7. Not connected8. Fuel pressure sensor positive9. Insufficient engine oil pressure sensor signal10. Air flow meter temperature signal11. Not connected12. Not connected13. Not connected14. Flow meter air rate signal15. EGR solenoid valve negative16. Cylinder 1 injector negative17. Cylinder 2 injector negative18. Not connected19. Not connected20. Fuel pressure regulator negative on the pump21. Timing sensor negative22. Not connected23. Supercharging pressure sensor positive24. Supercharging pressure sensor negative25. Timing sensor positive26. Not connected27. Flow meter negative28. Not connected29. Engine coolant temperature sensor earth30. VGT solenoid valve negative31. Cylinder 3 injector negative32. Not connected33. Not connected34. Not connected35. Not connected36. Not connected37. Supercharging temperature38. Fuel pressure sensor signal39. Not connected40. Not connected41. Supercharging pressure signal42. Not connected43. Engine rpm sensor positive44. Not connected45. Not connected46. Cylinder 4 injector positive47. Cylinder 1 injector positive48. Cylinder 3 injector positive49. Cylinder 2 injector positive50. Not connected51. Not connected52. Not connected53. Not connected54. Engine coolant temperature sensor signal55. Not connected56. Timing sensor signal57. Not connected58. Not connected59. Rpm sensor signal60. Not connectedCONNECTOR B1. Control unit power earth2. Control unit power earth3. Control unit power earth4. 12 V control unit power supply5. 12 V control unit power supply6. 12 V control unit power supply7. Fan 1st speed control (-)8. Fan 2nd speed control (-)9. Not connected10. Air conditioning compressor linear sensor negative11. Not connected12. Lambda sensor heating (-)13. Fuel temperature sensor earth14. Not connected15. Accelerator pedal potentiometer track 2 power supply16. Not connected17. Not connected18. Not connected19. Cruise Control - DOWN control (-)20. Cruise Control - ON control (-)21. Cruise Control - SET / UP control (+)22. Cruise Control - RESUME control23. Ignition-operated power supply24. Not connected25. Not connected26. Not connected27. Not connected28. Air conditioning compressor activation request29. Not connected30. Not connected31. Not connected32. Accelerator pedal potentiometer track 2 negative33. Not connected34. Not connected35. Accelerator pedal potentiometer track 1 negative36. Not connected37. Air conditioning compressor linear sensor positive38. Not connected39. Not connected40. CAN Low line41. Accelerator pedal potentiometer track 2 signal42. Not connected43. Not connected44. Lambda sensor signal45. Lambda sensor signal46. Lambda sensor reference earth47. Lambda sensor signal48. Not connected49. Not connected50. Direct power supply from battery51. Not connected52. Not connected53. Not connected54. Not connected55. Not connected56. Not connected57. Not connected58. Not connected59. Not connected60. Not connected61. Fuel temperature sensor signal62. Not connected63. Not connected64. CAN High line65. Accelerator pedal potentiometer track 1 signal66. Not connected67. Not connected68. Not connected69. Not connected70. Preheating control unit diagnostic input71. Not connected72. Not connected73. not connected74. Heater plugs relay control75. Not connected76. Not connected77. Not connected78. Injection failure warning light signal79. Air conditioning compressor control80. Main relay control81. Not connected82. Not connected83. Accelerator pedal potentiometer track 1 power supply84. Not connected85. Fuel pump relay control86. Not connected87. Climate control linear pressure sensor signal88. K line89. Not connected90. Water in diesel filter sensor signal91. Not connected92. Brake pedal switch93. Clutch pedal switch94. Not connected

Rpm sensor

SpecificationsThis is fitted on the crankcase and faces the phonic wheel on the flywheel.It is inductive type, i.e. its operation is determined by magnetic field changes generated by the teeth passing in front of the phonic wheel (60-2 teeth).The injection control unit uses the rpm sensor signal to:- determining the engine speed of rotation- determining the angular crankshaft position
The rpm sensor components are illustrated in the diagram.
1. Brass bush2. Permanent magnet3. Plastic sensor casing4. Coil reel5. Polar core6. Ring gear or flywheelPIN OUT
PinDescriptionSignal type
1Flywheel signal (A)Frequency output
2Flywheel signal (B)Frequency output
Technical specificationsWinding resistance 790 Ohm +/- 20%Winding resistance 680 mH +/- 20% (f=1khz)The recommended distance (gap) between the end of the sensor and the flywheel for obtaining correct signals should be 0.8 - 1.5 mm.This distance is not adjustable. If the gap is found to be outside the tolerance limits, check the condition of the sensor and phonic wheel.The graph shows the sensor output signal in relation to the horizontal development of the flywheel.
OperationThe changeover from full to empty determined by the presence or absence of a gap brings about a magnetic flux change sufficient to generate an induced alternating voltage proportional to the number of teeth on the ring (or phonic wheel).The frequency and amplitude of the voltage send to the electronic control unit provides the latter with an indication of the engine angular speed.

Cam angle sensor

SpecificationsThis Hall effect sensor is fitted on the camshaft housing facing the camshafts.A tooth on the pulley allows the timing sensor to indicate engine timing position.The injection control unit uses the timing sensor signal to recognize T.D.C. at the end of the compression and during starting to synchronize the engine management control unit with the engine.The sensor is fitted by the exhaust side camshaft.
OperationA current-carrying semiconductor layer immersed in a normal magnetic field (force lines at right angles to current direction) generates a potential difference known as a Hall voltage at its terminals.If current intensity remains constant, the generated voltage depends on magnetic field intensity alone. Periodic changes in magnetic field intensity are sufficient to generate a modulated electrical signal with frequency proportional to the speed of magnetic field change.To produce this change, a tooth on the inner part of the pulley periodically moves close to the sensor.
PIN_OUT
PinDescriptionSignal type
1EarthEarth
2Timing signalFrequency output
3Power supply12 V input
In the specific case of the timing sensor it receives a 5 Volt power supply from the engine management control unit.All the times the rotor passes in front of the sensor a variation in the actual sensor output voltage is produced through the Hall effect; this variation takes place for the entire duration that the rotor passes in front of the sensor after which the signal returns to the original value (5 V).

Air temperature and excess pressure sensor

It is fitted on the air intake manifold and the signal sent to the engine management control unit makes it possible to:- modulate the turbocharger pressure;- protect the engine against overheating;- diagnose the operation of the air flow meter.
PIN OUT
PinDescriptionSignal type
1EarthEarth
2Air temperature sensor outputAnalogue output
3Power supply+5 V input.
4Pressure sensor outputAnalogue output
Sensor specifications
Temperature in °CResistance R in Ohm
MinimumAverageMaximum
- 40453014815351006
- 35337033576337823
- 30253502685428359
- 25192652037621487
- 20147851561416443
-15114531207812702
- 10895194269901
- 5705574197783
0560558876168
5448747074926
103618.73791.13963.5
152938.53074.93211.3
202401.92510.62619.3
251975.82062.92150.1
301644.71715.41786.2
351374.21431.81489.5
401152.41199.61246.7
45969.91008.61047.4
50819.1851.1883.0
55694.2720.7747.1
60590.3612.3634.2
65503.6521.9540.2
70431.0446.3461.6
75370.1382.89395.7
80318.68329.48340.27
85275.25284.37293.48
90238.43246.15253.86
95207.12213.67220.23
100180.42186.00191.58
105157.37162.35167.32
110137.63
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