Repair instructions
Group 30: Electrical system
Rail pressure measurement This measurement is used for measuring the rail pressure. For example if the engine doesn’t start this measurement can show the rail pressure while the engine is cranking. If it is air in the system the rail pressure could be too low for the engine control unit to activate injection. 1.
NOTE! Starter key in position 0.
2.
Undo the connector from the sensor.
3.
Connect adapter cable (885675) between the sensor and the engine control unit.
4.
Use multimeter (9812519) for voltage measurement. Connect the COM from the multimeter to measurement point 1. Connect V from the multimeter to measurement point 2.
5.
NOTE! Starter key in position I. The multimeter should now show 0.5 Volt which is equal to 0Mpa (0bar).
6.
When cranking the engine, read the voltage value on the multimeter and look in the table which pressure the voltage equals.
NOTE! To activate injection a rail pressure of at least 25 MPa (250 bar) is demanded.
Voltage
0.5
0.95
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
MPa
0
20.3
22.5
27.0
31.5
36.0
40.5
45.0
49.5
54.0
Bar
0
203.0
225.0
270.0
315.0
360.0
405.0
450.0
495.0
540.0
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
MPa
58.5
63.0
67.5
72.0
76.5
81.0
85.5
90.0
94.5
99.0
Bar
585.0
630.0
675.0
720.0
765.0
810.0
855.0
900.0
945.0
990.0
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
MPa
103.5
108.0
112.5
117.0
121.5
126.0
130.5
135.0
139.5
144.0
Bar
1035.0
1080.0
1125.0
1170.0
1215.0
1260.0
1305.0
1350.0
1395.0
1440.0
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
MPa
148.5
153.0
157.5
162.0
166.5
171.0
175.5
180.0
Bar
1485.0
1530.0
1575.0
1620.0
1665.0
1710.0
1755.0
1800.0
Voltage
Voltage
Voltage
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