8.
Monitor that "Fuel pressure" data should be stable.
Sudden poor power and poor acceleration above certain rpm while driving could be caused by abnormal fuel system, intake and exhaust system leakage, abnormal EGR system, abnormal VGT system, abnormal CPF system. The purpose of this inspection is to analyze the cause of poor power and poor acceleration.
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". | ● "EGR and MAFS inspection" |
Case2 | ● Fuel pressure" is unstable or "Rail pressure regulator (rail)" and "Rail pressure regulator (pump)" data is abnormal. ● "Fuel pressure" is NOT controlled by ECM to follow "Fuel pressure-Target" at stall test, finally poor acceleration occurs or engine stall. | ● Go to "Low fuel pressure inspection" |
