Suzuki WagonR+ RB310 Service Manual page 2427

6-68 ENGINE DIAGNOSIS
INSPECTION
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Is there DTC(s) other than fuel system
(DTC P0171/P0172)?
3 Check HO2S-1 Output Voltage.
1) Connect scan tool to DLC with ignition switch OFF.
See Fig. 1.
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?
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. 2.
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 vary according to engine speed. See Fig. 3.
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 4 4) If OK, then check injector resistance.See Fig. 4.
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. 5.
Injected Fuel Volume: 44 – 54 cc/15 sec 1.49/
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. 6.
Is vacuum felt?
7 Check intake manifold absolute pressure sensor for
performance (See DTC P0105 Diag. Flow Table).
Is it in good condition?
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.
1.55 – 1.82/1.90 US/Imp.oz/15 sec)
YES
Go to Step 2.
Go to applicable
DTC Diag. Flow
Table.
Go to Step 4.
Go to Step 5.
2
,
2
,
Go to Step 6.
Check EVAP
control system
(See Section
6E).
Go to Step 8.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Go to Step 3.
Go to DTC
P0130 Diag.
Flow Table
(HO2S-1 circuit
check).
Go to Diag. Flow
Table B-3 Fuel
Pressure Check.
Check injector
circuit or replace
fuel injector(s).
Go to Step 7.
Repair or
replace.