Suzuki 2000 Grand Vitara SQ625 Service Manual page 159

6-1-48 ENGINE (H25 ENGINE)
TABLE A-2 MALFUNCTION INDICATOR LAMP CIRCUIT CHECK
MIL REMAINS ON AFTER ENGINE STARTS
WIRING DIAGRAM/CIRCUIT DESCRIPTION
Refer to TABLE A-1.
TROUBLESHOOTING
STEP
1 DTC check:
(1) With ignition switch OFF, install scan tool.
(2) Start engine and check DTC.
Is there any DTC(s)?
2 MIL Circuit check:
(1) With ignition switch OFF, disconnect couplers from
ECM (PCM).
Does MIL turn ON at ignition switch ON?
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
1 MIL Flashing Pattern check:
1) Turn ignition switch ON.
Does lamp flashing pattern indicate diagnostic trouble
code?
2 Diag. Switch Circuit check:
Is diag. switch terminal connected to ground via service
wire?
ACTION
ACTION
YES
Go to Step 2 of
"ENGINE DIAG.
FLOW TABLE" in
this section.
"V/Y" wire shorted to
ground circuit.
YES
Go to Step 2.
System is in good
condition.
NO
Go to Step 2.
Substitute a known-
good ECM (PCM)
and recheck.
NO
Go to "Diagnosis" in
Section 8G.
"Y" circuit shorted to
ground. If circuit is
OK substitute a
known-good ECM
(PCM) and recheck.