Suzuki SWIFT RS415 2017, Service Manual

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Engine Mechanical: 1D-4
Diagnostic Information and Procedures
Compression Check
S4RS0A1404001
Check compression pressure on all 4 cylinders as
follows:
1) Warm up engine to normal operating temperature.
2) Stop engine after warming up.
NOTE:
After warming up engine, place transaxle
gear shift lever in “Neutral”, and set parking
brake and block drive wheels.
3) Disconnect ignition coil couplers (1).
4) Remove ignition coil assemblies (2) with high-
tension cord (3).
5) Remove all spark plugs.
6) Disconnect fuel injector wires (4) at the coupler.
7) Install special tools (Compression gauge) into spark
plug hole.
Special tool
(A): 09915–64512
(B): 09915–64530
(C): 09915–67010
8) Disengage clutch (1) (to lighten starting load on
engine) for M/T vehicle, and depress accelerator
pedal (2) all the way to make throttle fully open.
9) Crank engine with fully charged battery, and read the
highest pressure on compression gauge.
Low or average
engine speed range
with heavy engine
load
To the advanced
side
To advance the closing timing of the
intake valve in order to improve the
volumetric efficiency. Improvement of generating the
engine torque at low and
average engine speed.
High engine speed
range with heavy
engine load
To the retarded side
To retard the closing timing of the
intake valve in order to improve the
volumetric efficiency.
Improvement of generating the
engine power.
Low engine coolant
temperature
Most retarded
To shorten the valve opening overlap in
order to prevent the exhaust gas
counterflow to intake manifold and
reduce the fuel increasing.
To slow the fast idle speed of the
engine as a result of stabilizing the
engine idling.
Stabilization of the fast idling of
the engine.
Improvement of the fuel
efficiency.
At engine starting and
stopping
Most retarded
To shorten the valve opening overlap in
order to prevent the exhaust gas
counterflow to intake manifold.
Improvement of start ability.
Driving condition Valve timing Target of control Effect
I2RH0B140003-
(A) (C)
(B)
I3RH0B140009-
I2RH0B140005-