Ignition Timing Inspection
Ignition timing is not adjustable. If ignition timing is out of specification, check system related parts.
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) When using SUZUKI scan tool (1), connect SUZUKI scan tool to DLC (2) with ignition switch OFF.
Special Tool
(A) : SUZUKI scan tool
2) Start engine and warm it up to normal operating temperature.
3) Make sure that all of electrical loads except ignition are switched off.
4) Check to be sure that idle speed is within specification referring to Idle Speed / Idle Air Control (IAC) Duty Inspection:M13A without VVT .
5) Fix ignition timing to initial one as follows.
a) When using SUZUKI scan tool:
Select “Misc Test” mode on SUZUKI scan tool and fix ignition timing to initial one.
b) When not using SUZUKI scan tool: (engine not equipped with VVT system)
Disconnect scan tool from DLC, and connect D and E terminals of monitor connector (1) or E to body ground by using service wire so that ignition timing is fixed on initial one.
6) Using timing light (1), check that ignition timing is within specification.
Initial ignition timing
Test switch terminal grounded or fixed with SUZUKI scan tool : 5 ± 3° BTDC (at idle speed)
Ignition order
1 – 3 – 4 – 2
7) If ignition timing is out of specification, check the followings.
CKP sensor
CKP sensor plate
CMP sensor
CMP sensor rotor tooth of camshaft
TP sensor
Test switch signal circuit
Timing chain cover installation
8) After checking initial ignition timing, release ignition timing fixation by using SUZUKI scan tool or disconnecting service wire from monitor connector.
9) With engine idling (test switch terminal ungrounded, throttle opening at closed position and vehicle stopped), check that ignition timing is about 4° – 20° BTDC (engine not equipped with VVT system) or 2° – 18° BTDC (engine equipped with VVT system). (Constant variation within a few degrees from 4° – 20° (engine not equipped with VVT system) or 2° – 18° (engine equipped with VVT system) indicates no abnormality but proves operation of electronic timing control system.) Also, check that increasing engine speed advances ignition timing.
If above check results are not satisfactory, check CKP sensor, test switch terminal circuit and ECM.