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Make sure of fuel leak when fuel pressure gauge is installed for low pressure fuel system. Make sure of fuel leak after reassembling fuel hose quick-connector.

When DTC relates to rail pressure is displayed, Normal fuel supplying to high pressure pump must be inspected before checking high pressure fuel system.

Disconnect fuel supply hose quick-connector.

☞ Make sure of fuel leak after disconnecting fuel hose quick-connector and an inrush of foreign substances.

Install pressure gauge of low pressure fuel between the fuel hose quick-connectors.

☞ Make sure of using vacuum gauge (CRT-1051), gauge connection tube (CRT-1052), connection adapter (CRT-1053).

note

Refer to "CRT-1000 Tester composition" of detail inspections (Equipment settings).

IG KEY "ON", ENGINE "ON"

☞ Fuel pressure will be 0 bar after rising by 3.5 bar when low pressure fuel pump is operated approx. 2 seconds at IG KEY 'ON'.

☞ Make sure of fuel leak in the quick-connector at ENGINE 'ON' after installing pressure gauge.

■ Specification : Approx. 4.6 ~ 5.2 bar (pointer shook rapidly) at idle (Load is not applied).

Inspect change of the fuel pressure while accelerating engine or stall test.

☞ The more engine rpm is higher, the more pointer shaking is bigger.

☞ Approx. 4.5 bar at accelerating engine (Load is not applied.) or stall test.

IG KEY "OFF", ENGINE "OFF"

☞ Fuel pressure will be 0 bar gradually (within 1 ~ 2 seconds) with ENGINE 'OFF'.

Symptom		Inspection procedure
Case1	● Pressure of low pressure fuel system is normal.	● ☞ Go to 'High pressure fuel system inspection'
Case2	● Pressure of low pressure fuel system is low continuously or fuel pressure is under 3.0 bar while accelerating engine.	● Go to 'Fuel pressure of low fuel pressure inspection' procedure.
Case3	● Pressure of low pressure fuel system is 0 bar (fuel pump is not operated) or low irregularly.	● Go to 'Fuel pump circuit inspection' procedure.