Per the Manual...
6F2-6 IGNITION SYSTEM (FOR J20/H25 ENGINES
Narrative below. Narrative
plus diagrams in Manual link.
Service Manual SQ416SQ420SQ625_2 of 2
IGNITION TIMING CHECK AND ADJUSTMENT
NOTE:
Before starting engine, place transmission gear shift lever in
“Neutral” (shift selector lever to “P” range for A/T model), and
set parking brake.
1) Start engine and warm it up to normal operating temperature.
2) Make sure that all of electrical loads except ignition are switched
off.
3) Check to be sure that idle speed is within specification.
Refer to SECTION 6E1 or 6E2.
4) [Using SUZUKI scan tool (Tech 1)]
Connect SUZUKI scan tool (Tech 1) to DLC (1) with ignition
switch OFF, restart engine and fix ignition timing by using fixed
spark mode of SUZUKI scan tool (Tech 1).
Special Tool
(A): 09931-76011 (SUZUKI scan tool)
(B: Mass storage cartridge
(C): 16/14 pin DLC (OBD-II adaptor) cable
[Not using SUZUKI scan tool (Tech 1)]
a) Remove monitor coupler cap.
b) Ground test switch terminal in monitor coupler by using service
wire so that ignition timing is fixed on initial one.
5) Set timing light to ignition harness for No.1 cylinder.
6) Using timing light, check that timing observed from viewpoint
is within specification.
Initial ignition timing of viewpoint
(when it is fixed by Tech 1 or service wire): 5 1 BTDC
Ignition order: 1-3-4-2 (J20 engine)
: 1-6-5-4-3-2 (H25 engine)
Special Tool
(A): 09930-76420
7) If ignition timing is out of specification, loosen flange bolt(s), adjust
timing by turning CMP sensor while engine is running, and
then tighten bolt(s).
Tightening Torque
(a): 15 N.m (1.5 kg-m, 11.0 lb-ft)
8) After tightening bolt(s), recheck that ignition timing is within
specification.
9) After checking and/or adjusting, end fixed spark mode of SUZUKI
scan tool or disconnect service wire from monitor coupler.
CAUTION:
Driving with test switch terminal grounded will cause
damage to catalyst.
Be sure to disconnect service wire after adjustment.
NOTE:
In this state, ignition timing may vary more or less of initial
ignition timing but it is nothing abnormal.
10) With engine idling (closed throttle position and vehicle
stopped), check that ignition timing is about BTDC 12 – 16
(J20 engine), 10 –13 ( H25 engine with monitor connector),
6 – 12 (H25 engine without monitor connector) (shown in the
figure). Also, check that increasing engine speed advances
ignition timing.
If above check results are not satisfactory, check input signals
related to this system.