4396631

Check Rail Pressure Regulator.

(1)

Ignition "OFF".

(2)

Disconnect Rail Pressure Regulator.

(3)

Measure resistance between terminal 1 and 2 of rail preussure regulator connecor(Component side).

Specification : 2.07 ~ 2.53 Ω (20°C)

(4)

Is the measured resistance within specifications ?

YES

▶ Go to " Check regulating pressure " as below.

▶ Substitute with a known-good rail pressure regulator and check for proper operation.

If the problem is corrected, replace rail pressure regulator and then go to "Verification of Vehicle Repair" procedure.

Check regulating pressure.

(1)

Ignition "ON" & Engine "ON".

(2)

Ignition "OFF" then Igintion "ON" before Main relay OFF.

(3)

Monitor signal waveform or graph function of current data by connecting scantool at terminal 2 of Rail preussure regulator.

caution

If Main relay OFF, Monitoring current data is impossible. Because Sensor power is cut and communication between scantool and ECM is off.

This test should be done without any leakage from injector nozzle, return line and high pressure line.

Time to pressurize upto 250bar is required as shortly as possible after starting but the time to release the pressure to 100 bar after ignition off is required as quickly as passble. However, time to release the pressure from 100bar to 0bar is required as slowly as possible. Refer to picture1 and 2 as below.

Voltage

Pressure

Voltage for rail pressure sensor at idle keep up 1.2V ~ 1.4V.

Then, the voltage will drop to 0.7V at the point of Key off.

Finally Signal waveform shows that voltage is getting slow down.

Pressure detected by Rail pressure sensor keep up 250bar at idle.

Then, Pressure will drop rapidly upto 100bar at the point of key off.

Finally, Graph shows that pressure is getting slow down.

(4)

Is the rail pressure data displayed correctly ?

YES

▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification vehicle Repair" procedure.

▶ Perform Rail Pressure Sensor & Rail Pressure regulator Inspection procedure. For more detail information, refer to DTC P0192,P0193 and P0190 for Rail Pressure sensor and DTC P1182,P1183 and P1184 for Rail Pressure regulator troubleshooting procedure.

Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.