Engine Basic Check - Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual

6-34 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES)

Engine Basic Check

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
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 engine idle speed/IAC duty referring to
"Idle speed/IAC Duty Inspection" in Section
6E1.
Is check result as specified?
6 Check ignition timing referring to "Ignition Tim-
ing Inspection" in Section 6F1 or 6F2.
Is check result as specified?
7 Is immobilizer control system equipped?
8 Check immobilizer system malfunction as fol-
lows.
1) Check immobilizer indicator lamp or MIL
(malfunction indicator lamp) for flashing.
Is it flashing when ignition switch is turned to
ON position?
9 Check fuel supply as follows:
1) Check to make sure that enough fuel is
filled in fuel tank.
2) Turn ON ignition switch for 3 seconds and
then OFF.
Repeat this a few times.
Is fuel return pressure (returning sounds) felt
from fuel return hose when ignition switch is
turned ON?
10 Check fuel pump for operating.
Was fuel pump operating sound heard from fuel
filler for about 3 seconds after ignition switch
ON and stop?
11 Check ignition spark referring to "Ignition Spark
Test" in Section 6F1 or 6F2.
Is it in good condition?
12 Check fuel injector referring to "Fuel Injector" in
Section 6E1.
Is it in good condition?
Action Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to "Engine Diagnosis
Table" in this section.
Go to Step 8.
Go to "Diagnostic Flow
Table" in Section 8G.
Go to Step 11.
Go to "Diag. Flow Table B-
3".
Go to Step 12.
Go to "Engine Diagnosis
Table" in this section.
No
Go to "Engine Diag. Flow
Table".
Charge or replace battery.
Go to "Diagnosis Table" in
Section 6G or 6G1.
Go to Step 7.
Go to "Engine Diagnosis
Table" in this section.
Adjust ignition timing or
check input signals
related to ignition system.
Go to Step 9.
Go to Step 9.
Go to Step 10.
Go to "Diag. Flow Table B-
1".
Go to "Diagnosis Table" in
Section 6F1 or 6F2.
Go to "Diag. Flow Table B-
2".