8.
Monitor that "Fuel pressure" data should be stable.
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 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", "Engine speed", "Fuel Quantity", "Rail pressure regulator (rail)", "Rail pressure regulator (Pump)" parameter on the scantool.
Monitor "Rail pressure regulator (rail)", "Rail pressure regulator (Pump)" at fuel temperature 50 ~ 70℃, engine speed 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" and "Fuel pressure-Target" parameters on the scantool.
Monitor that "Fuel pressure-Target" and "Fuel pressure" data should be almost same at stall test.
Refer to "Stall test" of detail inspections (Equipment settings).
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. | ● Rail pressure regulator is stuck. ● Replace common rail assembly (Bank 2 side). |
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" |
