Suzuki WagonR+ RB310 Service Manual page 2431

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6-72 ENGINE DIAGNOSIS
INSPECTION
STEP
1
Was "ENGINE DIAG. FLOW TABLE" performed?
2
Is there DTC other than Fuel system (DTC P0171/P0172)
and misfire (DTC P0300-P0304)?
3
Check Ignition System.
1) Remove spark plugs and check them for;
D Air gap: 1.0 – 1.1 mm (0.040 – 0.043 in.) See Fig. 1.
D Carbon deposits
D Insulator damage
D Plug type
If abnormality is found, adjust, clean or replace.
2) Disconnect all injector connectors. See Fig. 2.
3) Connect spark plugs to high tension cords and then
ground spark plugs.
4) Crank engine and check that each spark plug sparks.
Are above check results satisfactory?
4
Check Fuel Pressure (Refer to Section 6E for details).
1) Release fuel pressure from fuel feed line.
2) Install fuel pressure gauge. See Fig. 3.
3) Check fuel pressure.
With fuel pump operating
and engine at stop
At specified idle speed
Is measured value as specified?
5
Check Fuel Injectors and Circuit.
1) Using sound scope (1) or such, check operating sound of
each injector (2) when engine is running. Cycle of
operating sound should very according to engine speed.
See Fig 4.
If no sound or an unusual sound is heard, check injector
circuit (wire or coupler) or injector.
2) Turn ignition switch OFF and disconnect a fuel injector
connector.
3) Check for proper connection to fuel injector at each
terminal.
4) If OK, then check injector resistance. See Fig. 5.
Injector Resistance: 12 – 13 ohm at 20_C (68_F)
5) Carry out steps 1) and 3) on each injector.
6) Check each injector for injected fuel volume referring to
Section 6E. See Fig. 6.
Injected Fuel Volume: 40 – 50 cc/15 sec (1.35/1.41 –
7) Check each injector for fuel leakage after injector closed.
Fuel Leakage: Less than 1 drop/min.
Is check result in step 1) and 3) to 7) satisfactory?
ACTION
: 270 – 310 kPa, 2.7 – 3.1 kg/cm
38.4 – 44.0 psi.
: 270 – 310 kPa, 2.7 – 3.1 kg/cm
38.4 – 44.0 psi.
1.69/1.76 US/Imp. oz/15 sec)
YES
Go to Step 2.
Go to "ENGINE
DIAG. FLOW
TABLE".
Go to applicable
Go to Step 3.
DTC Diag.
Flow Table.
Go to Step 4.
Check ignition
system parts
(Refer to Section
6F1).
Go to Step 5.
Go to Diag. Flow
Table B-3 fuel
pressure check.
2
,
2
,
Go to Step 6.
Check injector
circuit or replace
fuel injector(s).
NO

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