Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 159

6-1-18 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE)
5. TROUBLE SYMPTOM CONFIRMATION
Based on information obtained in Step 1 "CUSTOMER COMPLAINT ANALYSIS" and Step 2 "DTC/FREEZE
FRAME DATA CHECK", confirm trouble symptoms. Also, reconfirm DTC according to "DTC CONFORMATION
PROCEDURE" described in each "DTC FLOW TABLE".
6. and 7. RECHECKING AND RECORD OF DTC
Refer to "DTC Check" in this section for checking procedure.
8. ENGINE BASIC INSPECTION AND ENGINE DIAGNOSIS TABLE
Perform basic engine check according to the "ENGINE BASIC INSPECTION FLOW TABLE" first. When the end
of the flow table has been reached, check the parts of the system suspected as a possible cause referring to
"Engine Diagnosis Table" and based on symptoms appearing on the vehicle (symptoms obtained through steps
of customer complaint analysis, trouble symptom confirmation and/or basic engine check) and repair or replace
faulty parts, if any.
Engine Basic Inspection Flow Table
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
6E2.
Is check result as specified?
6 Check ignition timing referring to "Ignition Tim-
ing Inspection" in Section 6F2.
Is check result as specified?
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 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?
8 Check fuel pump for operating.
Was fuel pump operating sound heard from fuel
filler for about 3 seconds after ignition switch
ON and stop?
9 Check ignition spark referring to "Ignition Spark
Test" in Section 6F2.
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 9.
Go to "Diag. Flow Table B-
3" in this section.
Go to Step 10.
No
Go to "Engine Diag. Flow
Table".
Charge or replace battery.
Go to "Diagnosis Table" in
Section 6G.
Go to Step 7.
Go to "Engine Diagnosis
Table" in this section.
Adjust ignition timing.
Go to Step 8.
Go to "Diag. Flow Table B-
1" in this section.
Go to "Diagnosis Table" in
Section 6F2.