2007 > 2.7L V6 GASOLINE >
DESCRIPTION
The CVVT (Continuously Variable Valve Timing) which is installed on the exhaust camshaft controls intake valve open
and close timing in order to improve engine performance.
The intake valve timing is optimized by CVVT system depending on engine rpm.
This CVVT system improves fuel efficiency and reduces NOx emissions at all levels of engine speed, vehicle speed,
and engine load by EGR effect because of valve over - lap optimization.
The CVVT changes the phase of the intake camshaft via oil pressure.
It changes the intake valve timing continuously.
OPERATION
The CVVT system makes continuous intake valve timing changes based on operating conditions.
Intake valve timing is optimized to allow the engine to produce maximum power.
Cam angle is advanced to obtain the EGR effect and reduce pumping loss. The intake valve is closed quickly to
reduce the entry of the air/fuel mixture into the intake port and improve the changing effect.
Reduces the cam advance at idle, stabilizes combustion, and reduces engine speed.
If a malfunction occurs, the CVVT system control is disabled and the valve timing is fixed at the fully retarded position.
2007 > 2.7L V6 GASOLINE >
INSTALLATION
If the OCVs are installed incorrectly, the vehicle may be damaged.
So when installing them, ensure the OCV and harness connector colors match(Components and harness side).
[Bank and its color] Bank Component side Harness side
Bank 1 (RH) GreyGrey
Bank 2 (LH) BlackBlack
INSPECTION
FUNCTION AND OPERATION PRICIPLE
The Continuously Variable Valve Timing (CVVT) system controls the amount of valve overlap by varying the amount of
oil flow into an assembly mounted on each intake camshaft through PCM control of an oil control valve. This system
uses two oil control valves, one on each bank. An Oil Temperature Sensor (OTS) is used to allow PCM monitoring of
engine oil temperature. As oil is directed into the chambers of the CVVT assembly, the cam phase is changed to suit
various performance and emissions requirements.. 1. When camshaft rotates engine rotation- wise: Intake- Advance / Exhaust- Retard
2. When camshaft rotates counter engine rotation- wise: Intake- Retard / Exhaust- Advance
SPECIFICATION
Item Specification
Coil Resistance (Ω) 6.7 ~ 7.7Ω at 20°C (68°F)
CIRCUIT DIAGRAM
2007 > 2.7L V6 GASOLINE >
Description
The automatic transmission is a combination of 3 - element 2 - phase 1 - stage torque converter and double shaft
electrocally - controlled unit which provides 4 speeds forward and 1 reverse. To improve the efficiency of power
transmission, the line pressure control was changed applying “Variable Force Solenoid (VFS) valve” on this model.
However, adopting VFS on this model, the line pressure is variably changed according to TPS and the vehicle speed,
this will enable more improved efficiency of power transmission and fuel consumption.
Characteristics
Some of the characteristics include:
▶Different power transfer
▶Different component layout
▶New shift logic(HIVEC) to improve shift feeling
▶Position of Valve Body
▶Variable shift pattern
▶Communication protocol and method
▶Step gate type shift lever.
Item Details
Weight Reduction 1. Aluminum oil pump
a. 2.3kg Approx
2. Pressed parts a. Retainer and hub of brakes and clutches
b. Carrier of planetary gear set
Better shift quality 1. Independent control of clutches and brakes enabled better control of
hydraulic pressure and skiped shifts (4 to 2, 3 to 1)
2. During N to D or N to R shift, feedback control adopted.
3. When starting from Creep condition, reduction of shock.(Creep condition is
controlled with 1st gear)
4. Solenoid valve frequency is increased for more accurate control. 35Hz to
61.3Hz except DCCSV that is 35Hz and VFS that is 600Hz.
5. HIVEC adoption for better shift feeling.
6. Variable shift pattern.
Increase in Power train efficiency 1. Fully Variable Line Pressure
2. VFS(Variable Force Solenoid)
- Manual shifting possible
- Step gate type shift lever
32ND SOLENOID(SCSV C)
Solenoid valve driver for 5sec.3. P range
4. Vehicle speed 0km/h
5. Engine stop
6. No failure
7. TPS < 1V
4
OD SOLENOID(SCSV D)
5 TORQUE CONVERTER SOLENOID VALVE
6 A/T CONTROL RELAY OFF for 3 sec. -
7 INTELLIGENT SHIFT PROHIBIT Prohibit until IG off -
8 CLEAR LEARNING VALUE --
ROAD TEST
No.Condition OperationJudgment value Check item
1 Ignition switch : OFF
Ignition switch
(1) ON Battery voltage (mV)
Control relay
2 a.
Ignition switch :
ON
b. Engine : Stopped
c. Selector lever
position : P Selector lever position
(1) P, (2) R, (3) N, (4) D
(1) P, (2) R, (3) N, (4)
DTransaxle range switch
Accelerator pedal
(1) Released
(2) Half depressed
(3) Depressed (1) 400~1,000 mV
(2)Gradually rises
from (1)
(3) 4,500~5,000 mVThrottle position sensor
Brake pedal
(1) Depressed
(2) Released (1) ON
(2) OFF
Brake switch
3 a.
Ignition switch : ST
b. Engine : Stopped Starting test with lever P or
N range
Starting should be
possibleStarting possible or
impossible
4 Warming up
Drive for 15 minutes or
more so that the automatic
fluid temperature becomes
70~90°C Gradually rises to
70~90°C
Oil temperature sensor
5 a.
Engine : Idling
b. Selector lever
position : N A/C switch
(1) ON
(2) OFF
(1) ON
(2) OFF
Triple pressure switch
Accelerator pedal
(1) Released
(2) Half depressed (1) ON
(2) OFF
Idle position switch
(1) 600~900 rpm
(2) Gradually rises
from (1)
(1) Data changes Communication with
engine - ECU
Selector lever position
(1) N→D
(2) N→R Should be no
abnormal shifting
shocks
Time lag should be
within 2 secondsMalfunction when starting
Selector lever position
: N (Carry out on a
flat and straight road) Selector lever position and
vehicle speed
a. Idling in 1st gear
(Vehicle stopped)
b. Driving at constant
speed of 20 km/h in 1st
gear (2) 1st, (4) 3rd, (3)
2nd, (5) 4th
Shift condition
(2) 0%, (4) 100%, (3)
100%, (5) 100% Low and reverse solenoid
valve
(2) 0%, (4) 0%, (3)
0% Underdrive solenoid valve
REPLACEMENT
If you have a fluid changer, use this changer to replace the fluid. If you do not, replace it using the following
procedure.1. Disconnect the hose which connects the transmission and the oil cooler which is within the radiator only in 2.4L
engine(3.3L- the oil cooler is separated).
2. Start the engine and let the fluid drain out.
Running conditions : "N" range with engine idling.
The engine should be stopped within one minute after it is started. If the fluid has all drained out before then,
the engine should be stopped at that point.
3. Romove the drain plug(A) from the bottom of the transmission case to drain the fluid.
4.Install the drain plug via the gasket, and tighten it to the specified torque.
TORQUE :
40~50Nm (4.0~5.0 kgf.m, 29~36 lb - ft)
5. Pour the new fluid in through the oil filler tube.
Stop pouring if the full volume of fluid cannot be poured in.
6. Repeat the procedure in step (2).
Check the old fluid for contamination. If it has been contaminated, repeat the steps (5) and (6).
7. Pour the new fluid in through the oil filler tube.
8. Reconnect the hose which was disconnected in step (1) above and firmly replace the oil level gauge.(In case of
this "replace", this means after wiping off any dirt around the oil level gauge, insert it into the filler tube.)
9. Start the engine and run it at idle for 1~2 minutes.
10. Move the select lever through all positions, and then move it to the "N" position.
11. Drive the vehicle until the fluid temperature rises to the normal temperature (70~80°C), and then check the fluid
level again. The fluid level must be at the HOT mark.
12. Firmly insert the oil level gauge(A) into the oil filler tube.
a.During air bleeding, replenish the fluid supply so that the level never falls below the lower position of the
filter.
b. If air bleeding is done while the vehicle is idling, the air will be broken up and absorbed into the fluid. Be
sure to do the bleeding only while cranking.
c. Reinstall the fuel pump fuse, and start the engine(idling).
d. Turn the steering wheel to the left and the right until there are no air bubbles in the oil reservoir.
Do not hold the steering wheel turned all the way to either side for more than ten seconds.
e. Confirm that the fluid is not milky, and that the level is up to the position specified on the level gauge.
f. Confirm that there is little change in the surface o the fluid when the steering wheel is turned left and right.
a. If the surface of the fluid changes considerably, air bleeding should be done again.
b. If the fluid level rises suddenly when the engine is stopped, it indicates that there is still air in the
system.
c. If there is air in the system, a jingling noise may be heard from the pump and the control valve
may also produce unusual noises. Air in the system will shorten the life of the pump and other
parts.
OIL PUMP PRESSURE TEST (OIL PUMP RELIEF PRESSURE)
1.Disconnect the pressure hose from the oil pump. Connect the special tool between the oil pump and pressure hose
as illustrated.
2. Bleed the air, and then start the engine and turn the steering wheel several times so that the fluid temperature
rises to approximately 50°C (122°F).
3. Set the engine speed to 1,000 rpm.
4. Close the shut- off valve of the special tool and measure the fluid pressure to confirm that it is within the range.
standard vaule :
Relief pressure: 90 +3/- 2 kgf/cm²
Don’t keep the shut- off valve on the pressure gauge closed for longer than seconds.
volume, Subtract the volume of drained oil from 120cc(4.20 oz.) the result is the amount of oil you should drain
from the new compressor (through the suction fitting).
b. Replace the O - rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them.
Be sure to use the right O - rings for R- 134a to avoid leakage.
c. To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other
refrigerant oils.
d. Immediately after using the oil, replace the cap on the container and seal it to avoid moisture absorption.
e. Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint,
wash it off immediately.
f. Adjust the drive belt (Refer to HA - 14)
g. Charge the system and test its performance. (Refer to HA - 9)
INSPECTION
1.Check the plated parts of the disc & hub assembly (A) for color changes, peeling or other damage. If there is
damage, replace the clutch set.
2. Check the pulley (B) bearing play and drag by rotating the pulley by hand. Replace the clutch set with a new one if
it is noisy or has excessive play/drag.
3.Measure the clearance between the pulley (B) and the disc & hub assembly (A) all the way around. If the
clearance is not within specified limits, remove the disc & hub assembly and add or remove shim (gap washer) as
needed to increase or decrease clearance.
Clearance: 0.45 ± 0.1mm (0.018 ± 0.004 in.)
The shims (gap washers) are available in seven thicknesses: 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm
and 1.3mm.
14.Remove the evaporator core(A).
15.Be careful that the inlet and outlet pipe are not bent during heater core removal, and pull out the heater core.
16. Install the heater core in the reverse order of removal.
17. Installation is the reverse order of removal, and note these items :
a. If you're installing a new evaporator, add refrigerant oil (ND - OIL8).
b. Replace the O - rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing
them. Be sure to use the right O - rings for R- 134a to avoid leakage.
c. Immediately after using the oil, replace the cap on the container, and seal it to avoid moisture absorption.
d. Do not spill the refrigerant oil on the vehicle ; it may damage the paint ; if the refrigerant oil contacts the paint,
wash it off immediately
e. Apply sealant to the grommets.
f. Make sure that there is no air leakage.
g. Charge the system and test its performance.
h. Do not interchange the inlet and outlet heater hoses and install the hose clamps securely.
i. Refill the cooling system with engine coolant.