Suzuki GA413, Service Manual

Page: 813 / 1246

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-37
GA413
supple
TABLE A-2 MALFUNCTION INDICATOR LAMP CIRCUIT CHECK – LAMP
REMAINS “ON” AFTER ENGINE STARTS
WIRING DIAGRAM / CIRCUIT DESCRIPTION – Refer to table A-1.
INSPECTION
STEP ACTION YES NO
1 Diagnostic Trouble Code (DTC) check
1) Check DTC referring to DTC CHECK section.
Is there any DTC(s)? Go to Step 2 of ENGINE
DIAG. FLOW TABLE. Go to Step 2.
2 DTC check
Start engine and recheck DTC while engine
running.
Is there any DTC(s)? Go to Step 3.
3 MIL Circuit check
1) Turn OFF ignition switch.
2) Disconnect connectors from ECM.
Does MIL turn ON at ignition switch ON? “PPL/YEL” wire circuit
shorted to ground. Substitute a known-good
ECM and recheck.
TABLE A-3 MALFUNCTION INDICATOR LAMP CIRCUIT CHECK – MIL
FLASHES AT IGNITION SWITCH ON (VEHICLE WITH MONITOR
CONNECTOR)
WIRING DIAGRAM / CIRCUIT DESCRIPTION – Refer to table A-1.
INSPECTION
STEP ACTION YES NO
1 MIL flashing pattern check:
1) With the ignition switch ON position, check
MIL flashing pattern.
Does MIL flashing pattern indicate DTC (diag-
nostic trouble code)?
Go to Step 2. Go to “Diagnosis” in sec-
tion 8G.
2 Diagnosis switch terminal check:
1) With ignition switch OFF position, disconnect
ECM electrical connectors.
2) Check for continuity from L20-21 terminal of
ECM connector to ground.
Is there continuity?
“BLU/WHT” wire (diagno-
sis switch terminal)
shorted to ground circuit.
If OK, substitute a
known-good ECM and
recheck. Substitute a known-good
ECM and recheck.