D439E Service Manual 4. Fuel system
161
Trouble diagnosis flow in systems of sensors and wirings
Sensors and wirings check flow
Check connectors
and wires for connection (DCP, TDC,
PC
Check rotation
signals, and active conditions of CKP
sensor and TDC sensor
Check
PC sensor output
(Diagnosis equipment) at 0 MPa after
10 minutes from engine
stop
Check
PC sensor
(diagnosis equipment)
Check to see if pressure
increases to the pressureset at leakage
check mode and check PC
movement at the
same time.
Check accel
sensor output (with diagnosis
equipment) and voltage value at idle
full (PTO system also must be
checked)
Check main relay
operating sound and voltage supply
Repair or replace connector
connection and wiring
Check and replace flywheel for any
damage (Check to see if the air
gap between sensor and flywheel
tone wheel is proper)
CKP sensor
TDC sensor
Check wirin
lace PC sensor
Check Pressure
limiter leakage (Return pipe at the
pressure limiter is cold,
warm-u
Replace PC sensor
Replace the rail
Re
Adjust accel sensor
Check wiring and replace
relay
NG
OK
NG
NG NG
NG
Hot
Cold
NG
NG
OK
OK
OK
NG
OK
OK
OK
OK
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