Suzuki WagonR+ RB310 Service Manual page 2380

ENGINE BASIC INSPECTION
This check is very important for troubleshooting when ECM has detected no DTC and no abnormality has been
found in visual inspection.
Follow the flow table carefully.
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check battery voltage.
Is it 11 V or more?
3 Is engine cranked?
4 Does engine start?
5 Check idle speed as follows:
1) Warm up engine to normal operating temp.
2) Shift transmission to neutral position for M/T
("P" position for A/T).
3) All of electrical loads are switched off.
4) Check engine idle speed with scan tool.
See Fig. 1.
Is it 650 – 750 r/min (700 – 800 r/min. for A/T
vehicle)?
6 Check ignition timing as follows:
1) When not using SUZUKI scan tool, disconnect
scan tool from DLC and connect test switch
terminal of monitor coupler to ground. See Fig. 2.
When using SUZUKI scan tool, select "MISC"
mode on SUZUKI scan tool and fix ignition timing
to initial one. See Fig. 3.
2) Remove air cleaner bolt and clips and shift air
cleaner position to observe ignition timing.
3) Using timing light (1), check initial ignition timing.
See Fig. 4.
Is it 5_ ± 3_ BTDC at specified idle speed?
7 Check fuel supply as follows:
1) Check to make sure that enough fuel is filled in fuel
tank.
2) Turn ON ignition switch for 2 seconds and then
OFF. See Fig. 5.
Is fuel pressure from fuel feed hose (1) when ignition
switch is turned ON?
8 Check fuel pump for operating.
1) Was fuel pump operating sound heard from fuel
filler for about 2 seconds after ignition switch ON
and stop?
9 Check ignition spark as follows:
1) Disconnect injector couplers.
2) Remove spark plugs and connect them to high
tension cords.
3) Ground spark plugs.
4) Crank engine and check if each spark plug sparks.
Is it in good condition?
10 Check fuel injector for operation as follows:
1) Install spark plugs and connect injector
connectors.
2) Using sound scope (1), check operating sound of
each injector (2) when cranking engine. See Fig. 6.
Was injector operating sound heard from all
injectors?
ACTION YES
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to "SYMPTOM-
TO-DIAGNOSIS
MATRIX TABLE".
Go to Step 9.
Go to "DIAG. FLOW
TABLE B-3".
Go to Step 10.
Go to "SYMPTOM-
TO-DIAGNOSIS
MATRIX TABLE".
ENGINE DIAGNOSIS 6-21
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Charge or replace
battery.
Go to "DIAGNOSIS"
in Section 6G.
Go to Step 7.
Go to "SYMPTOM-
TO-DIAGNOSIS
MATRIX TABLE".
Check ignition control
related parts referring
to Section 6F3.
Go to Step 8.
Go to "DIAG. FLOW
TABLE B-2".
Go to "DIAGNOSIS"
in Section 6F3.
Go to "DIAG. FLOW
TABLE B-1".