Suzuki Wagon R Manual page 1156

6-1-64 GENERAL INFORMATION AND 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.
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). See Fig. 1.
Does HO2S-1 output voltage deflect between below 0.3 V and
over 0.6 V repeatedly?
4 Check Fuel Pressure (Refer to section 6E1 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 : 90 – 140 kPa, 0.9 – 1.4 kg/cm
Is measured value as specified?
5 Check Fuel Injector and Circuit.
1) Turn ignition switch OFF and disconnect fuel injector
connector.
2) Check for proper connection to fuel injector at each terminals.
3) If OK, then check injector resistance. See Fig. 3.
Injector resistance: 0.5 – 1.5 Ω at 20_C (68_F)
4) Connect injector connector.
5) Check that fuel is injected out in conical shape from fuel
injector when running engine.
6) Check injector for fuel leakage after engine stop.
Fuel leakage: Less than 1 drop/min.
Is check result 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. 4.
Is vacuum felt?
7 Check intake manifold absolute pressure sensor for
performance (See DTC P0105 Diag. Flow Table).
Is it in good condition?
ACTION
: 160 – 210 kPa, 1.6 – 2.1 kg/cm
22.7 – 29.9 psi.
12.8 – 20.0 psi.
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
6E1).
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.
Go to Step 7.
Repair or
replace.