Suzuki SY413 Service Manual page 2756

TABLE A-3 ECM POWER AND GROUND CIRCUIT CHECK – MIL DOESN'T
LIGHT AT IGNITION SWITCH ON AND ENGINE DOESN'T START
THOUGH IT IS CRANKED UP (Page 1 of 2)
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 tuned ON, the main relay turns ON (the contact point closes) and the main power is sup-
plied to ECM.
INSPECTION
STEP
1 Main Relay Operating Sound Check
Is operating sound of main relay heard at ignition switch ON?
2 Fuse Check
Is main "FI" fuse in good condition?
3 Main Relay Check
1) Turn OFF ignition switch and remove main relay.
2) Check for proper connection to main relay at terminal 3 and 4.
3) Check resistance between each two terminals. See Fig. 1 and 2.
Between terminals 1 and 2: Infinity
Between terminals 3 and 4: 70 – 110 W
4) Check that there is continuity between terminals 1 and 2 when
battery is connected to terminals 3 and 4. See Fig. 3.
Is main relay in good condition?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC) 6-2-39
ACTION YES NO
Go to Step 5. Go to Step 2.
Go to Step 3. Check for short in
circuits connected
to this fuse.
Go to Step 4. Replace main
relay.