6-20 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
ENGINE BASIC INSPECTION
This check is very important for troubleshooting when ECM (PCM) has detected no DTC and no abnormality has
been found in visual inspection.
Follow the flow table carefully.
STEP
ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check battery voltage.
Is it 11 V or more?
Go to Step 3. Charge or replace
battery.
3 Is engine cranked? Go to Step 4. Go to “DIAGNOSIS”
in Section 6G.
4 Does engine start? Go to Step 5. Go to Step 7.
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 800 – 900 r/min.?
Go to Step 6. Go to “ENGINE
DIAGNOSIS TABLE”.
6 Check ignition timing as follows.
1) Select “MISC” mode on SUZUKI scan tool and
fix ignition timing to initial one. See Fig. 2.
2) Using timing light (1), check initial ignition timing.
See Fig. 3.
Is it 5_ ± 3_ BTDC at specified idle speed?
Go to “ENGINE
DIAGNOSIS TABLE”.
Check ignition control
related parts referring
to Section 6F.
7 Check immobilizer system malfunction as follows.
1) Check immobilizer indicator lamp for flashing.
Is it flashing when ignition switch is turned to ON
position?
Go to “DIAGNOSIS” in
Section 8A.
Go to Step 8.
8 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. 4.
Is fuel return pressure (returning sounds) felt from fuel
feed hose (1) when ignition switch is turned ON?
Go to Step 10. Go to Step 9.
9 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?
Go to “DIAG. FLOW
TABLE B-3”.
Go to “DIAG. FLOW
TABLE B-2”.
10 Check ignition spark as follows.
1) Disconnect injector coupler.
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?
Go to Step 11. Go to “DIAGNOSIS”
in Section 6F.
11 Check fuel injector for operation as follows.
1) Install spark plugs and connect injector
connectors.
2) Check that fuel is injected out in conical shape
from fuel injector when cranking.
Is it in good condition?
Go to “ENGINE
DIAGNOSIS TABLE”.
Go to “DIAG. FLOW
TABLE B-1”.
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