Suzuki SY413 Service Manual page 2754

TABLE A-1 MALFUNCTION INDICATOR LAMP CIRCUIT CHECK – LAMP
DOES NOT COME "ON" AT IGNITION SWITCH ON (BUT ENGINE
AT STOP)
WIRING DIAGRAM
1. Main fuse
2. Ignition switch
3. Relay box
4. Main relay
5. Malfunction indicator lamp
in combination meter
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, ECM causes the main relay to turn ON (close the contact point). Then, ECM
being supplied with the main power, turns ON the malfunction indicator lamp (MIL). When the engine starts to run
and no malfunction is detected in the system, MIL goes OFF but if a malfunction was or is detected, MIL remains
ON even when the engine is running.
INSPECTION
STEP
1 MIL Power Supply Check
1) Turn ignition switch ON.
Do other indicator / warning lights in combina-
tion meter comes ON?
2 ECM Power and Ground Circuit Check
Does engine start?
3 MIL Circuit Check
1) Turn ignition switch OFF and disconnect
connectors from ECM.
2) Check for proper connection to ECM at
terminal E92-4.
3) If OK, then using service wire, ground ter-
minal E92-4 in connector disconnected.
Does MIL turn on at ignition switch ON?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC) 6-2-37
ACTION YES
Go to Step 2. "IG" fuse blown, main fuse blown,
ignition switch malfunction, "B / W"
circuit between "IG" fuse and
combination meter or poor coupler
connection at combination meter.
Go to Step 3. Go to TABLE A-3 ECM POWER
AND GROUND CIRCUIT CHECK.
If engine is not cranked, go to
DIAGNOSIS in SECTION 6G2 or
6G3.
Substitute a known- Bulb burned out or "V" wire circuit
good ECM and re- open.
check.
NO