D439E Service Manual 4. Fuel system
158
Trouble diagnosis flow when HUNTING is occurred
NG
Idle rotation
hunting (change)
Ex)
Fix the single fall of sensors,
ECU, pump SCV and TWV
system
CKP (Crankshaft Position)
Sensor system
PC sensor system (rail
pressure sensor)
Accel sensor system
ECU sensor system (CPUI
malfunction)
Pump SCV system
TWV system
Defect caused by FCCB (fuel
control for cylinder balance) is
processed by other flow
Check SCV resistance value
7.9±0.25Ω(24V), 20℃
Fuel system check flow
Sensors, wirings check flow
Check
injector injection (Diagnosis
equipment) Check the cylinder
with no vibration change at one
cylinder stop mode
Check poor connection of ECU
ground and ECU connector
Pump system
Injector system
ECU system
Replace supply pump
Repair or replace
wiring
Check injector
wiring
Complete
Repair or correct the wiring
and connection
Complete
Erase the
trouble code and previous
pump learned values with the
diagnosis equipment.
Perform the learning again at idle
with no load after engine
warm up.
Replace ECU
Currently
malfunction
Currently
malfunction
NG
Completed
Hunting
corrected?
OK
NG
OK
OK
NG
OK
OK
OK
OK
OK
NG
NG
NG
Check based on
each trouble code
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