Suzuki Ignis Service Manual page 3395

6A1-6 ENGINE MECHANICAL (M13 ENGINE)
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Oil control valve
The oil control valve switches and adjusts the hydraulic pressure
applied to the cam timing sprocket by moving the spool valve (1)
according to the duty pulse signals output from the ECM. By this
operation, the intake valve timing is varied continuously. Signals
output from the ECM are the duty pulse of about 240 Hz.
Cam timing sprocket
4
The cam timing sprocket is equipped with the chambers for timing
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advancing (2) and retarding (3) which are separated by the rotor
(5). The rotor rotates receiving the hydraulic pressure applied to
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both the chambers. The sprocket (1) is installed on the housing
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(4) and the rotor is secured on the intake camshaft by fastening
the bolts. Therefore, the actuation of the rotor makes the phase
difference between the sprocket and intake camshaft.
6. Seal
Timing advancing
When the duty ratio of the signal output from the ECM is heavy,
the spool valve (4) of the oil control valve moves to the left (oppo-
site direction against the coil (5)). By this spool valve movement,
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the pressurized oil (1) is led into the chambers for timing advanc-
ing and the oil in the chambers for timing retarding is drained.
This operations actuate the rotor (3) and result in the advanced
timing of the intake valve.
2. Drain
Timing holding
When the duty ratio of the signal output from the ECM shows that
of holding, the spool valve of the oil control valve is located at
hold position. Because this condition generates no oil pressure
changes in both chambers, the rotor is fixed at a target position.
Timing retarding
When the duty ratio of the signal output from the ECM is light, the
spool valve of the oil control valve moves to the right (head for the
coil). By this spool valve movement, the pressurized oil is led into
the chambers for timing retarding and the oil in the chambers for
timing advancing is drained. This operations actuate the rotor and
result in the retarded timing of the intake valve.