Suzuki Wagon R Manual page 1130

6-1-38 GENERAL INFORMATION AND ENGINE DIAGNOSIS
TABLE A-1 MALFUNCTION INDICATOR LAMP CIRCUIT CHECK – LAMP DOES
NOT COME "ON" AT IGNITION SWITCH ON (BUT ENGINE AT STOP)
CIRCUIT DESCRIPTION
Ignition switch
Main fuse
When the ignition switch is turned ON, ECM (PCM) causes the main relay to turn ON (close the contact point).
Then, ECM (PCM) 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 de-
tected, 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 (PCM) Power and Ground Circuit
Check
Does engine start?
3 MIL Circuit Check
1) Turn ignition switch OFF and disconnect
connectors from ECM (PCM).
2) Check for proper connection to ECM
(PCM) at terminal E21-17.
3) If OK, then using service wire, ground
terminal E21-17 in connector
disconnected.
Does MIL turn on at ignition switch ON?
Malfunction indicator lamp in combination meter
Main relay
"IG COIL"
ACTION YES
Go to Step 2.
Go to Step 3.
Substitute a known-
good ECM (PCM) and
recheck.
NO
"IG COIL" fuse blown, main
fuse blown, ignition switch
malfunction, "BLK/WHT"
circuit between "IG COIL" fuse
and combination meter or
poor coupler connection at
combination meter.
Go to TABLE A-3 ECM (PCM)
POWER AND GROUND
CIRCUIT CHECK.
If engine is not cranked, go to
DIAGNOSIS in SECTION 6G.
Bulb burned out or
"PPL/WHT" wire circuit open.