Suzuki 2000 Grand Vitara SQ625 Service Manual page 46

6-42 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
TABLE A-2 MALFUNCTION INDICATOR LAMP CIRCUIT CHECK – MIL REMAINS "ON"
AFTER ENGINE STARTS
WIRING DIAGRAM/CIRCUIT DESCRIPTION
Refer to TABLE A-1.
INSPECTION
STEP
DTC Check:
1
1) With ignition switch OFF, install scan tool.
2) Start engine and check DTC.
Is there any DTC(s).
MIL circuit Check:
2
(1) With ignition switch OFF, disconnect couplers
from ECM (PCM).
Does MIL turn ON at ignition switch ON?
TABLE A-3 MIL CHECK – MIL FLASHES AT IGNITION SWITCH ON (vehicle with monitor
connector)
WIRING DIAGRAM/CIRCUIT DESCRIPTION
Refer to TABLE A-1.
INSPECTION
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?
TABLE A-4 MIL CHECK – MIL DOES NOT FLASH OR JUST REMAINS ON EVEN WITH
GROUNDING DIAGNOSIS SWITCH TERMINAL
WIRING DIAGRAM/CIRCUIT DESCRIPTION
Refer to TABLE A-1.
INSPECTION
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 (E61-29 connection) connected to
ECM/PCM properly?
3 Diag. switch Terminal Circuit Check:
1) Connect connectors to ECM (PCM).
2) Using service wire, ground E61-29 terminal with
connectors connected to ECM (PCM).
3) Turn ignition switch ON.
Does MIL flash?
ACTION
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.
YES
"V/Y" circuit shorted
to ground.
Go to Step 3.
"Y" or "B" circuit
open.
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.
NO
Go to Step 2.
Poor connector
connection.
Substitute a known-
good ECM (PCM)
and recheck.