Suzuki 2000 Grand Vitara SQ625 Service Manual page 45

TABLE A-1 MALFUNCTION INDICATOR LAMP CIRCUIT CHECK – MIL DOES NOT COME
"ON" OR DIMS AT IGNITION SWITCH ON (BUT ENGINE AT STOP)
WIRING DIAGRAM
1. ECM (PCM)
2. To ignition switch
3. Main fuse
4. Main relay
5. Monitor connector (if equipped)
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
combination 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 E61-34.
3) If OK, then using service wire, ground
terminal E61-34 in connector disconnected.
Does MIL turn on at ignition switch ON?
ACTION
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-41
YES
Go to Step 2.
Go to Step 3.
"W/R" circuit shorted
to ground or test
switch terminal of
monitor connector is
shorted to ground
(if equipped).
If OK, substitute a
known-good ECM
(PCM) and recheck.
NO
"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 TABLE A-5 ECM (PCM)
POWER AND GROUND
CIRCUIT CHECK.
If engine is not cranked, go to
DIAGNOSIS in Section 6G or
6G1.
Bulb burned out or "V / Y" wire
circuit open.