Repair Section
2
–
101
(1) Fuel pressure test procedure
• Connect the DST-2 to the vehicle-side test connector.
- With the vehicle idling, verify the rail pressure displayed on the DST-2.
System selection screen: Rail a ECU Data Monitor
6 Filter (supply pump inlet) clogging
• Fuel filter
- Check for fuel delivery from the priming
pump.
• Gauze filter
- Visually check for clogging due to foreign
material.
Clean the gauze filter, fuel filter and fuel piping
system, or replace the filters.
7 Oil level increase (engine internal leak)
• Verify whether the oil level increases on the
oil level gauge.
Check the engine.
8 High-pressure piping and CRS component
(injector supply pump, rail) fuel leaks (engine
external leak) (Refer to "(2) Fuel leak check".)
• Connect the DST-2 to the diagnostic connec-
tor. Activate the "Fuel Leak Check Function"
within the active test.
• Visually check and specify areas that leak
fuel.
< CAUTION >
In the event of a large fuel leak down-
stream of the flow damper, be aware
that fuel flow will stop and the leak will
cease due to flow damper operation.
Repair leaking high-pressure piping or replace
leaking parts.
Normal
Item Name (Abbrevi-
ated)
Explanation Check Conditions Reference Value Items of Importance
During an Abnormal-
ity
Rail Pressure (RP) • Displays the fuel
pressure in the rail.
• Display range: 0
MPa to 255 MPa
Following engine
warm-up, when the
engine is rotating
Fuel pressure in the
rail is displayed within
a range of 30 MPa to
160 MPa.
PCR1, PCR2 signals
(rail assembly)
NG
OK
NG
OK
NG
OK
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