Engine Basic Check - Suzuki 2000 Grand Vitara SQ625 Service Manual

6-28 ENGINE 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 Timing
Inspection" in Section 6F1 or 6F2.
Is check result as specified?
7 Is immobilizer control system equipped?
8 Check immobilizer system malfunction as follows.
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.
1) 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 Inspection"
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 "DIAGNOSIS"
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"
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"
in Section 6F1 or
6F2.
Go to "Diag. Flow
Table B-2".