Ignition Timing Check & 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.

Start engine and warm it up to normal operating temperature.
Make sure that all of electrical loads except ignition are switched OFF.
Check to be sure that idle speed is within specification referring to IDLE SPEED/IDLE AIR CONTROL (IAC) DUTY INSPECTION (Grand Vitara) or IDLE SPEED/IDLE AIR CONTROL (IAC) DUTY INSPECTION (XL-7).
Connect SUZUKI scan tool to DLC with ignition switch OFF, restart engine and fix ignition timing by using fixed spark mode of SUZUKI scan tool.
Special tool

(A): SUZUKI scan tool

Fig 1: Connecting SUZUKI Scan Tool To DLC
Courtesy of SUZUKI OF AMERICA CORP.
Set timing light to ignition harness for No. 1 cylinder.
Using timing light, check that timing observed from viewpoint is within specification.
Initial ignition timing of viewpoint (when it is fixed by SUZUKI scan tool) 5 +/- 1° BTDC

Ignition order 1-6-5-4-3-2

Special tool

(A): 09930-76420

Fig 2: Checking Timing
Courtesy of SUZUKI OF AMERICA CORP.
If ignition timing is out of specification, loosen CMP sensor bolt (2), adjust timing by turning CMP sensor (1) while engine is running, and then tighten bolt (2).
After tightening bolt (2), recheck that ignition timing is within specification.

Fig 3: Adjusting Timing By Turning CMP Sensor
Courtesy of SUZUKI OF AMERICA CORP.
After checking and/or adjusting, end fixed spark mode of SUZUKI scan tool.
NOTE: In this state, ignition timing may vary more or less of initial ignition timing but it is nothing abnormal.
With engine idling (closed throttle position and vehicle stopped), check that ignition timing is about BTDC 12-16°. Also, check that increasing engine speed advances ignition timing.
If above check results are not satisfactory, check input signals related to this system.

Fig 4: Checking Ignition Timing
Courtesy of SUZUKI OF AMERICA CORP.