Check Rail pressure.
Ignition "ON" & Engine "ON".
Ignition "OFF" then Igintion "ON" before Main relay OFF.
Monitor signal waveform or graph function of current data by connecting scantool at terminal 2 of Rail preussure regulator.
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 from rail pressure sensor at idle is required to keep up with 1.2V ~ 1.4V. Then, the voltage will be drop to 0.7V at the point of Key off. Finally Voltage is getting slowly down | Pressure detected by Rail pressure sensor is required to keep up with 250bar at idle. Then, Pressure will be drop rapidly upto 100bar at the point of key off. Finally, Pressure is getting slowly down. |
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 of Vehicle Repair" procedure.
NO
▶ Perform Fuel Pump relay, Injectors, Rail Pressure Sensor and Rail Pressure regulator Inspection procedure. For more detail information, refer to DTC P0232 and P0231 for Fuel pump relay, P0261~0272 for injectors 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.
