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3-1 HIGH PRESSURE TEST for each system
High pressure test with Injectors ( Step 2-1)
1
BOSCH SYTEM (With PRV type)
High pressure test without Injectors ( Step 2-2)
BOSCH SYTEM (With PRV type)
6
2
1
COMMONRAIL PLUG
1
Purpose of this test is to check the High pressure pump's and the
rail pressure sensor's performance.
TEST PROCEDURE
- Remove the wiring connectors from all Injectors.
- Install the HP controller and set the mode switch to
- Install ① PRV Dummy Resister and ② Rail Pressure Sensor Dummy in
each wiring connectors.
- Crank the engine and measure the rail pressure and injector back
leak amount.
SERVICE SPEC
700 bar
High pressure : Above
Back Leak : Less than 3 times than minimum amount injector
CHECK POINT (If test is failed )
- Fuel Leak (rail plug or pipes connection)
- PRV (leakage or damaged) & Fuel line
- HP pump (leakage or damaged)
The Purpose of this test is to confirm the High pressure pump
performance or to reconfirm high pressure pump performance
when measured value of pressure was lower than 700bar during
Step 2-1.
Avoid injector back leak completely by blocking rail outlet.
Test Procedure
- Remove the Injector pipes from the rail.
- ① Block the rail outlet using rail plug.
- Install the HP controller and set the mode switch to
- Crank the engine and measure the rail pressure.
SERVICE SPEC : Above 700 bar
If measured pressure from Step2-1was below 700bar and measured
pressure from Step2-2 was over 1000bar, the high pressure pump is in
good condition. The low pressure (below 700bar) might be read due to
too much injector back leak.
current mode.
( with normal Back Leak )
current mode.
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