Isuzu 4ja1 - 3. Insufficient Power

6 – 6 TROUBLESHOOTING
3. Insufficient Power
Step Action Value(s) Yes No
1 Was the air cleaner element condition OK? (Clogged
or not)
—
Go to Step 2
Clean or
replace the air
cleaner
element.
2 Was the intake air leakage found from intake
system?
— Repair or
replace the
intake air
system. Go to Step 3
3 Was the fuel filter element condition OK? (Clogged
or not)
—
Go to Step 4
Clean or
replace the fuel
filter element.
4 Check the fuel injection pipes.
Does the injection pipes have obstruction or any
damage?
— Repair or
replace the fuel
injection pipes. Go to Step 5
5 Was the water contained in the fuel? — Replace the
fuel Go to Step 6
6 Was the injection nozzle pressure or spray pattern
normal?
—
Go to Step 7
Readjust the
injection nozzle
pressure or
replace the
nozzle.
7 Was the compression pressure OK? 3.0 MPa
(31.0 kg/cm
2
,
441 psi) at
200 rpm
Go to Step 8
Readjust the
valve clearance
or replace the
cylinder head
gasket or
cylinder liner or
piston or piston
ring or valve
and valve seat
8 Was the exhaust pipe clogged? — Repair or
replace the
exhaust pipe. Go to Step 9
9 Was the exhaust gas leakage found from exhaust
system?
— Repair or
replace the
exhaust
system. Go to Step 10
10 Was the waste gate control actuator hose broken or
cracked?
— Replace the
hose. Go to Step 11
11 Was the waste gate working completely? —
Go to Step 12
Replace the
turbocharger
assembly.
12 Was turbocharger working completely? —
Go to Step 13
Replace the
turbocharger
assembly.
13 Are any DTC stored? — Go to indicated
DTC Solved