Suzuki sq-416-420-625 Service Manual page 437

DIAGNOSTIC FLOW TABLE B-1
WIRING DIAGRAM
G16 / J20 Engines
H25 Engine
TROUBLESHOOTING
STEP
1 "O/D OFF" light circuit check:
(1) With ignition switch OFF, disconnect
couplers from PCM.
(2) Using service wire, connect E61-20
(G16/J20 engines) or E61-7 (H25 engine)
terminal of disconnected PCM coupler and
ground.
Does "O/D OFF" light turn ON at ignition
switch ON?
"O/D OFF" LIGHT CIRCUIT CHECK
("O /D OFF" LIGHT DOESN'T LIGHT AT IGNITION SWITCH ON BUT
ENGINE STARTS UP)
ACTION
AUTOMATIC TRANSMISSION (4 A / T) 7B1-35
YES
Poor E61-20 (G16/J20
engines) or E61-7 (H25
engine) terminal
connection.
If OK, substitute a known-
good PCM and recheck.
1. PCM
2. J / B
3. O / D cut switch
4. P / N change switch
5. J / C
1. PCM
2. Fuse
3. O / D cut switch
4. P / N change switch
5. J / C
6. J / C
NO
Bulb burned out or faulty
"W/B", "B/W" wire.