A85669
TC
CG
A82935
Tester Terminal
Engine Wire
14-2
-ENGINE MECHANICALENGINE(3MZ-FE)
2094Authorr:Datee:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
(c)When not using the hand-held tester or OBD II scan tool:
(1)Using SST, connect terminals 13 (TC) and 4 (CG)
of the DLC3.
SST09843-18040
NOTICE:
rMake sure of the terminal numbers before connecting
them. Connecting wrong terminals can damage the
engine.
rTurn OFF all electrical systems before connecting the
terminals.
rPerform this inspection after the cooling fan motor is
turned OFF.
(2)Remove the V-bank cover.
(3)Pull out the engine wire colored by black and red as
shown in the illustration.
(4)Connect the tester terminal of the timing light to the
engine.
NOTICE:
Use a timing light which detects the first signal.
(5)Inspect the ignition timing at idle.
Ignition timing: 8 to 12t BTDC
NOTICE:
When checking the ignition timing, the transmission is in
the neutral position.
HINT:
Run the engine at 1,000 to 1,300 rpm for 5 seconds, then check
that the engine speed returns to the idle speed.
(6)Disconnect terminals 13 (TC) and 4 (CG) of the
DLC3.
(7)Inspect the ignition timing at idle.
Ignition timing: 7 to 24t BTDC
(8)Confirm that the ignition timing advances when the
engine speed is increased.
(9)Remove the timing light.
8.INSPECT ENGINE IDLE SPEED
(a)Warm up the engine.
(b)When using the hand-held tester or OBD II scan tool:
(1)Connect the hand-held tester or OBD II scan tool to the DLC3.
(2)Enter DATA LIST MODE on the hand-held tester or OBD II scan tool.
Idle speed: 630 to 730 rpm
NOTICE:
rWhen checking the idle speed, the transmission is in the neutral position.
rCheck the idle speed with the cooling fan OFF.
rSwitch OFF all accessories and air conditioning before connecting the hand-held tester or OBD
II scan tool.
HINT:
Refer to the hand-held tester or OBD II scan tool operator’s manual for further details.
P19471
Compression Gauge
-ENGINE MECHANICALENGINE(3MZ-FE)
14-3
2095Authorr:Datee:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
9.INSPECT COMPRESSION
(a)Warm up and stop the engine.
(b)Remove the intake air surge tank (see page 11-13).
(c)Disconnect the injector connectors.
(d)Remove the ignition coils.
(e)Remove the spark plugs.
(f)Inspect the cylinder compression pressure.
(1)Insert a compression gauge into the spark plug
hole.
SST09992-00500
(2)Fully open the throttle.
(3)While cranking the engine, measure the compres-
sion pressure.
Compression pressure:
1.5 MPa (15.3 kgf/cm2, 218 psi)
Minimum pressure:
1.0 MPa (10.2 kgf/cm2, 145 psi)
Difference between each cylinder:
100 kPa (1.0 kgf/cm2, 15 psi)
NOTICE:
rAlways use a fully-charged battery to obtain engine
speed of 250 rpm or more.
rCheck the other cylinder’s compression pressure in
the same way.
rThis measurement must be done as quickly as pos-
sible.
(4)If the cylinder compression is low, pour a small
amount of engine oil into the cylinder through the
spark plug hole, then inspect again.
HINT:
rIf adding oil increases the compression, the piston rings
and/or cylinder bore may be worn or damaged.
rIf pressure stays low, the valve may be sticking or seated
improperly, or there may be leakage past the gasket.
10.INSPECT CO/HC
HINT:
The ECM properly controls the CO/HC concentration in the emission gas.
(a)Start the engine.
(b)Run the engine at 2,500 rpm for approximately 180 seconds.
(c)Insert the CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.
(d)Check the CO/HC concentration at idle and/or at 2,500 rpm.
HINT:
When doing the 2 mode (with the engine is at idle and at 2,500 rpm) tests, these measuring order are pre-
scribed by the applicable local regulations.
If the CO/HC concentration does not comply with the regulations, troubleshoot in the order given below.
(1)Check the heated oxygen sensor operation (see page 05-126).
14-4
-ENGINE MECHANICALENGINE(3MZ-FE)
2096Authorr:Datee:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
(2)See the table below for possible causes, then inspect the applicable causes and repair them if
necessary.
COHCProblemsCauses
NormalHighRough idle
5.Faulty ignitions:
rIncorrect timing
rFouled, shorted or improperly gapped plugs
6.Incorrect valve clearance
7.Leaks in intake and exhaust valves
8.Leaks in cylinders
LowHighRough idle(Fluctuating HC reading)
1.Vacuum leaks:
rPCV hoses
rIntake manifold
rThrottle body
rBrake booster line
2.Lean mixture causing misfire
HighHighRough idle(Black smoke from exhaust)
1.Restricted air filter
2.Plugged PCV valve
3.Faulty SFI systems:
rFaulty pressure regulator
rDefective engine coolant temperature sensor
rDefective mass air flow meter
rFaulty ECM
rFaulty injectors
rFaulty throttle body
14193-03
A78698
B
A
C
A78699
A
B
A78699
A
B
A78698
B
A
C
-ENGINE MECHANICALDRIVE BELT(3MZ-FE)
14-5
2097Authorr:Datee:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
DRIVE BELT(3MZ-FE)
REPLACEMENT
1.REMOVE FRONT WHEEL RH
2.REMOVE FRONT FENDER APRON SEAL RH
3.REMOVE V (COOLER COMPRESSOR TO
CRANKSHAFT PULLEY) BELT NO.1
(a)Loosen bolts A and B.
(b)Loosen the adjusting bolt C, then remove the V-ribbed
belt.
4.REMOVE VANE PUMP V BELT
(a)Loosen bolts A and B, then remove the V-ribbed belt.
5.INSTALL VANE PUMP V BELT
(a)Install the V-ribbed belt on each pulley.
(b)Using a bar, adjust the V-ribbed belt tension, then tighten
bolt B.
Torque: 43 Nm (439 kgfcm, 32 ftlbf)
(c)Tighten bolt A.
Torque: 43 Nm (439 kgfcm, 32 ftlbf)
6.INSTALL V (COOLER COMPRESSOR TO
CRANKSHAFT PULLEY) BELT NO.1
(a)Install the V-ribbed belt on each pulley.
(b)Tighten the adjusting bolt C, then adjust the V-ribbed belt
tension.
(c)First tighten bolt A, then tighten bolt B.
Torque:
18 Nm (178 kgfcm, 13 ftlbf) for bolt A
58 Nm (591 kgfcm, 43 ftlbf) for bolt B。