Suzuki 2000 Grand Vitara SQ625 Service Manual page 160

TABLE A-4 MALFUNCTION INDICATOR LAMP CHECK
MIL DOES NOT FLASH OR JUST REMAINS ON EVEN WITH GROUNDING DIAGNOSIS SWITCH
TERMINAL (vehicle with monitor connector)
WIRING DIAGRAM/CIRCUIT DESCRIPTION
Refer to TABLE A-1.
TROUBLESHOOTING
STEP
1 MIL Circuit check:
1) Turn ignition switch OFF and disconnect connectors
from ECM (PCM).
Does MIL turn ON at ignition switch ON?
2 ECM (PCM) Connection check:
1) Turn ignition switch OFF.
Is connector (E61-30 connection) connected to ECM
(PCM) properly?
3 Diag. switch Terminal Circuit check:
1) Connect connectors to ECM (PCM).
2) Using service wire, ground E61-30 terminal with
connectors connected to ECM (PCM).
3) Turn ignition switch ON.
Does MIL flash?
ACTION
ENGINE (H25 ENGINE) 6-1-49
YES
"V/Y" circuit shorted
to ground.
Go to Step 3.
"Y" or "B" circuit open.
NO
Go to Step 2.
Poor connector
connection.
Substitute a known-
good ECM (PCM)
and recheck.