Suzuki GA413, Service Manual

Page: 841 / 1246

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-65
GA413
supple
INSPECTION
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE
DIAG. FLOW
TABLE”.
2 Is there DTC(s) other than fuel system
(DTC P0171 / P0172)? Go to applicable
DTC Diag. Flow
Table. Go to Step 3.
3 Check HO2S-1 Output Voltage.
1) Connect scan tool to DLC with ignition switch OFF.
2) Warm up engine to normal operating temperature and keep it
at 2000 r / min. for 60 sec.
3) Repeat racing engine (Repeat depressing accelerator pedal 5
to 6 times continuously and take foot off from pedal to enrich
and enlean A / F mixture).
Does HO2S-1 output voltage deflect between below 0.3 V and
over 0.6 V repeatedly?
Go to Step 4. Go to DTC
P0130 Diag.
Flow Table
(HO2S-1 circuit
check).
4 Check Fuel Pressure (Refer to section 6E for details).
1) Release fuel pressure from fuel feed line.
2) Install fuel pressure gauge.
3) Check fuel pressure. See Fig. 1.
With fuel pump operating
and engine at stop
: 270 – 310 kPa, 2.7 – 3.1 kg/cm
2
,
38.4 – 44.0 psi.
At specified idle speed : 210 – 260 kPa, 2.1 – 2.6 kg/cm
2
,
29.8 – 37.0 psi.
Is measured value as specified?
Go to Step 5. Go to Diag. Flow
Table B-3 Fuel
Pressure Check.
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 vary according to engine speed. See Fig. 2.
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.
See Fig. 3.
Go to Step 6. Check injector
circuit or replace
fuel injector(s).
g
4) If OK, then check injector resistance.
Injector Resistance: 10 – 15 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. 4.
Injected Fuel Volume: 43 – 47 cc/15 sec
(1.45/1.51 – 1.58/1.65 US/Imp.oz/15 sec)
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?
6 Check EVAP Canister Purge Valve.
1) Disconnect purge hose (1) from EVAP canister.
2) Place finger against the end of disconnected hose.
3) Check that vacuum is not felt there when engine is cool and
running at idle. See Fig. 5.
Is vacuum felt?
Check EVAP
control system
(See Section
6E). Go to Step 7.
7 Check intake manifold absolute pressure sensor for performance
(See step 4) of DTC P0105 (No.11) Diag. Flow Table).
Is it in good condition? Go to Step 8. Repair or
replace.