ENGINE DIAGNOSIS
6-9
5. TROUBLE SYMPTOM CONFIRMATION
Based on information obtained in Step 1 customer complaint analysis and Step 2 DTC check, confirm trouble
symptoms. Also, reconfirm DTC according to “DTC Confirmation Procedure” in Section 6E1.
6. and 7. RECHECKING AND RECORD OF DTC
Refer to “DTC Check” in section 6E1 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
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 engine idle speed / IAC duty referring to “Idle
Speed / IAC Duty Inspection” in section 6E1.
Is check result as specified?
Go to Step 6.
Go to “ENGINE
DIAGNOSIS TABLE”
in this section.
6
Check ignition timing referring to “Ignition Timing Inspec-
tion” in section 6F.
Is check result as specified?
Go to “ENGINE
DIAGNOSIS TABLE”
in this section.
Adjust ignition
timing.
7
Check fuel supply as follows:
1) Check to make sure that enough fuel is filled in fuel
tank.
2) Turn the ignition switch ON position for 3 seconds and
then turn it OFF position.
Repeat this a few times.
Is fuel return pressure (returning sounds) felt from fuel
return hose when the ignition switch is turned ON posi-
tion?
Go to Step 9.
Go to Step 8.
8
Check fuel pump for operating.
1) Was fuel pump operating sound heard from fuel filler
for about 3 seconds after turning the ignition switch ON
position and stop?
Go to “Diag. Flow
Table B-3” in section
6E1.
Go to “Diag. Flow
Table B-1” in section
6E1.
9
Check ignition spark referring to “Ignition Spark Test”
in section 6F.
Is it in good condition?
Go to Step 10.
Go to “DIAGNOSIS”
in section 6F.
10
Check fuel injector referring to “Fuel Injector Inspection” in
section 6E1.
Is it in good condition?
Go to “ENGINE
DIAGNOSIS TABLE”
in this section.
Go to “Diag. Flow
Table B-2 in section
6E1.
