6.
Monitor 'Rail Pressure Regulator (pump)' at 50~70 ℃ fuel temperature and Idle rpm.
If engine stalls with sudden poor acceleration, classify the cause of engine stalls.
Engine stalling could be caused by abnormal fuel system, intake/exhaust system leakage, abnormal EGR system, abnormal VGT system.
IG KEY "ON", ENGINE "ON".
Connect GDS(scantool) to Data Link Connector (DLC).
Allow the engine to warm up to normal operating temperature.
Electrical system and A/CON "OFF".
Select 'Fuel pressure', 'Fuel pressure-Target', 'Rail pressure regulator (pump)', 'Rail Pressure Regulator(pump)', 'Engine Speed', 'Fuel Quantity' parameters on the GDS(scantool).
Monitor 'Rail Pressure Regulator (pump)' at 50~70 ℃ fuel temperature and Idle rpm.
Monitor that 'Fuel Pressure -Target' and 'Fuel Pressure' data should be almost same.
Monitor that 'Fuel Pressure' data should be stable.
Use graph function after selecting 'Fuel Pressure', 'Fuel Pressure -Target' and 'Engine speed' parameters on the GDS(scantool).
Monitor that 'Fuel Pressure -Target' and 'Fuel Pressure' data should be almost same at stall test (acceleration).
Refer to "Stall test" of detail inspections (Equipment settings).
[ Rail pressure data at normal acceleration (load is applied) ]
[ Rail pressure data at normal acceleration (load is not applied) ]
☞ There is a different between target fuel pressure and fuel pressure after acceleration → deceleration (when load is not applied), but it is normal control state.
Symptom | Inspection procedure | |
Case1 | ● Fuel system data are normal and 'Fuel Pressure' is controlled well by ECM to follow "Fuel Pressure -Target". | ● Go to "EGR & MAFS inspection" |
Case2 | ● 'Fuel Pressure' is unstable or 'Rail Pressure Regulator (Rail), (Pump)' is abnormal. Also, 'Fuel Pressure' can not follow (poor acceleration or engine stalling occurs) to 'Fuel Pressure -Target' at stall test. | ● Go to "Low fuel pressure inspection" |
Case3 | ● 'Fuel Pressure' is higher than 'Fuel Pressure -Target' and Engine stalls. | ● Go to "High fuel pressure inspection" |
Case4 | ● Data of fuel system are normal, 'Fuel Pressure' is controlled well by 'Fuel Pressure -Target'. ● But Engine stalls after displaying abnormal 'Engine speed' data. DTC related to CKPS would be displayed sometimes. | ● Go to "CKPS inspection" |
