Special Tool - Suzuki Grand Vitara Service Manual

1) Connect scan tool to DLC (1) with ignition switch
OFF.

Special tool

(A): SUZUKI scan tool
(A)
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 and IAC
Throttle Valve Opening Inspection: in Section 1A".
5) Fix ignition timing by using "Fixed Spark" of "Misc
Test" mode on scan tool.
6) Set timing light (1) to high-tension cord (for M16
engine) or ignition coil harness (for J20 engine) for
No.1 cylinder and check that ignition timing is within
specification.
Initial ignition timing (fixed with SUZUKI scan
tool)
5° – 15° BTDC (at specified idle speed) (for J20
engine)
7° – 17° BTDC (at specified idle speed) (for M16
engine)
Ignition order
1 – 3 – 4 – 2
Special tool
(A): 09930–76420
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7) If ignition timing is out of specification, check the
followings.
• CKP sensor
• CKP sensor plate
• TP sensor
• CMP sensor
• CMP sensor rotor tooth of camshaft
• Wheel speed sensor (VSS)
• Knock sensor
• Timing chain cover installation
8) After checking initial ignition timing, release ignition
timing fixation by using scan tool.
9) With engine idling (throttle opening at closed position
and vehicle stopped), check that ignition timing is
about 7° – 17° BTDC for M16 engine or 5° – 15°
BTDC for J20 engine. (Constant variation within a
few degrees from 7° – 17° BTDC for M16 engine or
5° – 15° BTDC for J20 engine indicates no
abnormality but proves operation of electronic timing
control system.) Also, check that increasing engine
speed advances ignition timing.
If the check results are not satisfactory, check CKP
sensor and ECM.
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Ignition System:
[A]
10
0
1, (A)
[B]
1, (A)
[A]: For M16 engine
[B]: For J20 engine
1H-10
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