Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE) 6-1-57
Table A-2 Malfunction Indicator Lamp Circuit Check
MIL remains on after engine starts
WIRING DIAGRAM/CIRCUIT DESCRIPTION
Refer to TABLE A-1.
TROUBLESHOOTING
Table A-3 Malfunction Indicator Lamp Check
MIL flashes at ignition switch ON (vehicle with monitor connector)
WIRING DIAGRAM/CIRCUIT DESCRIPTION
Refer to TABLE A-1.
TROUBLESHOOTING
Step Action Yes No
1 DTC check :
1) With ignition switch OFF, install scan tool.
2) Start engine and check DTC.
Is there any DTC(s)?
Go to Step 2 of “Engine
Diag. Flow Table” in this
section. Go to Step 2.
2 MIL Circuit check :
1) With ignition switch OFF, disconnect cou-
plers from ECM (PCM).
Does MIL turn ON at ignition switch ON?
“PPL/YEL” wire shorted to
ground circuit. Substitute a known-good
ECM (PCM) and recheck.
Step Action Yes No
1 MIL Flashing Pattern check :
1) Turn ignition switch ON.
Does lamp flashing pattern indicate diagnostic
trouble code?
Go to Step 2. Go to “Diagnosis” in Sec-
tion 8G.
2 Diag. Switch Circuit check :
Is diag. switch terminal connected to ground via
service wire? System is in good condi-
tion. “YEL” circuit shorted to
ground. If circuit is OK
substitute a known-good
ECM (PCM) and recheck.