Diagnostic Information And Procedures; Compression Check - Suzuki GRAND VITARA Owner's Manual

1D-70 Engine Mechanical: For J20 Engine
System Operation
IMT vacuum solenoid valve open:
When IMT vacuum solenoid valve is OFF, the actuator side of IMT vacuum solenoid valve is lead to relief port. Under
this condition, the negative pressure is not applied to IMT valve actuator. The IMT valve, therefore, is totally opened
due to the force of return spring in IMT valve actuator.
The effective intake pipe length, therefore, becomes shorter.
IMT valve closed:
When IMT vacuum solenoid valve is ON, the actuator side of IMT vacuum solenoid valve is lead to vacuum tank.
Under this condition, the negative pressure of vacuum tank is applied to IMT valve actuator. The IMT valve, therefore,
is totally closed because the return spring in IMT valve actuator is compressed due to the negative pressure.
The effective intake pipe length, therefore, becomes longer.

Compression Check

Check compression pressure on all 4 cylinders as
follows:
1) Warm up engine.
2) Stop engine after warming up.
NOTE
After warming up engine, place transmission
gear shift lever in "Neutral" (shift selector
lever to "P" range for A/T model), and set
parking brake and block drive wheels.
3) Remove engine cover.
4) Disconnect ignition coil couplers.
5) Disconnect ignition coils (1).
6) Remove all spark plugs (2).

Diagnostic Information and Procedures

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7) Disconnect fuel injector wire harness at the coupler.
8) Install special tool (Compression gauge) into spark
plug hole.
Special tool
(A): 09915–64512
(B): 09915–64530
(C): 09915–67010
9) Disengage clutch (to lighten starting load on engine)
for M/T vehicle, and depress accelerator pedal all
the way to make throttle fully open.
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