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14-1
ENGINE MECHANICAL - ENGINE

ENGINE
1404Q-12

INSPECTION
1. INSPECT COOLANT (See page 16-1 )
2. INSPECT ENGINE OIL
3. INSPECT BATTERY
Standard specific gravity: 1.25 to 1.29 at 20_C (68_F)
4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSY
5. INSPECT SPARK PLUG (See page 18-3 )

6. INSPECT V-RIBBED BELT
Measuring Points for Belt Looseness
(a) Belt deflection:
Pressing force: 98 N (10 kgf, 221 lbf)
Generator
New belt Used belt
Vane Pump
mm (in.) mm (in.)
V ribbed belt 9.1 to 10.5 11.0 to 13.5
(For fan and generator) (0.358 to 0.413) (0.433 to 0.531)

Compressor V ribbed belt 8 to 10 11 to 14
Crank Shaft (for vane pump) (0.315 to 0.394) (0.433 to 0.551)
A52000
(b) Tension:
New belt Used belt
N (kg , lb) N (kg , lb)
V ribbed belt 617 to 853 294 to 490
(for fan and generator) (63 to 87 , 139 to 192) (30 to 50 , 66 to 110)
V ribbed belt 588 to 686 245 to 392
(for vane pump) (60 to 70 , 132 to 154) (25 to 40 , 55 to 88)

NOTICE:
S Check the drive belt deflection at the specified point.
S When installing a new belt, set its tension value as
specified.
S When checking a belt used for over 5 minutes, con-
firm the deflection value is within the specified one.
S When reinstalling a belt used for over 5 minutes, per-
form the check based on the used deflection value.
S V-ribbed belt tension and deflection value should be
checked after 2 revolutions of engine cranking.
S When using a belt tension gauge, confirm the accura-
cy first by using a master gauge.
7. INSPECT IGNITION TIMING
(a) Warm up engine.
(b) When using hand-held tester.
(1) Connect the hand-held tester to the DLC3.
HINT:
Please refer to the hand-held tester operator's manual for fur-
ther details.
Ignition timing : 8 to 12_ BTDC

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2300
14-2
ENGINE MECHANICAL - ENGINE

(c) When not using hand-held tester.
TC (1) Using SST, connect terminals 13 (TC) and 4 (CG)
of DLC3.
SST 09843-18040
NOTICE:
S Be careful not to connect incorrectly. It causes break-
age of the engine.
S Turn OFF all electrical systems.
CG A51075 S Operate the inspection when the cooling fan motor is
turned OFF.
(2) Remove the V-bank cover.

(3) Pull out the wire harness as shown in the illustration.
Connect the clip of the timing light to the engine.
NOTICE:
Use a timing light which can detect the first signal.
(4) Inspect ignition timing at idle.
Ignition timing : 8 to 12_ BTDC
NOTICE:
When checking the ignition timing, the transmission is in
Black A52005 neutral position.
HINT:
After engine rpm is kept at 1,000 to 1,300 rpm. for 5 seconds,
check that it returns idle speed.
(5) Disconnect terminals 13 (TC) and 4 (CG) of the
DLC3.
(6) Inspect ignition timing at idle.
Ignition timing : 7 to 24_ BTDC
(7) Confirm that ignition timing moves to advanced
angle when the engine rpm is increased.
(8) Remove the timing light.
8. INSPECT ENGINE IDLE SPEED
(a) Warm up the engine.
(b) When using hand-held tester.
(1) Connect the hand-held tester to the DLC3.
Idle speed: 550 to 650 rpm.
HINT:
Please refer to the hand-held tester operator's manual for fur-
ther details.

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2301
14-3
ENGINE MECHANICAL - ENGINE

(c) When not using hand-held tester.
TAC (1) Using SST, connect the tachometer test probe to
terminal 9 (TAC) of DLC3.
SST 09843-18040
(2) Check the idle speed.
Idle speed: 550 to 650 rpm.
NOTICE:
S Check idle speed with cooling fan OFF.
A52006 S Switch off all accessories and air conditioning.

9. INSPECT COMPRESSION
(a) Stop a warm engine.
(b) Disconnect the injector connectors.
(c) Remove the intake air surge tank. (See page 14-7 )
(d) Remove the ignition coil.
(e) Remove the spark plugs.

(f) Inspect cylinder compression pressure.
SST 09992-00500
(1) Insert a compression gauge into the spark plug
hole.
(2) While cranking the engine, measure the compres-
sion pressure.
Compression pressure:
1.5 MPa (15.3 kgf/cm2, 218 psi)
P19471 Minimum pressure:
1.0 MPa (10.2 kgf/cm2, 145 psi)
Difference between each cylinder:
100 kPa (1.0 kgf/cm2, 15 psi)
NOTICE:
S Always use a fully charged battery to obtain engine
speed of 250 rpm or more.
S Check other cylinder's compression pressure in the
same way.
S This measurement must be done in as short a time as
possible.
(3) If the cylinder compression is low, pour a small
amount of engine oil into the cylinder through the
spark plug hole and inspect again.
HINT:
S If adding oil increases the compression, it is likely that the
piston rings and/or cylinder bore are worn or damaged.
S If pressure stays low, a valve may be sticking or seating
improperly, or there may be leakage past the gasket.

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2302
14-4
ENGINE MECHANICAL - ENGINE

10. INSPECT CO/HC
(a) Start the engine.
(b) Race the engine at 2,500 rpm. for approx. 180 seconds.
(c) Insert CO/HC meter testing probe at least 40 cm (1.3 ft) into tailpipe during idling.
(d) Immediately check CO/HC concentration at idle and/or 2,500 rpm.
HINT:
S Complete the measuring within 3 minutes.
S When doing the 2 mode (idle and 2,500 rpm) test, the procedure may vary according to local regula-
tions.
(e) If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below.
(1) Check heated oxygen sensor operation. (See page 12-6 )
(2) See the table below for possible causes, and then inspect and correct the applicable causes if
necessary.
CO HC Problems Causes
4. Faulty ignitions:
S Incorrect timing
S Fouled, shorted or improperly gapped plugs
Normal High Rough idle
5. Incorrect valve clearance
6. Leaky intake and exhaust valves
7. Leaky cylinders
1. Vacuum leaks:
S PCV hoses
Rough idle S Intake manifold
Low High
(Fluctuating HC reading) S Throttle body
S Brake booster line
2. Lean mixture causing misfire
1. Restricted air filter
2. Plugged PCV valve
3. Faulty EFI systems:
Rough idle S Faulty pressure regulator
High High S Defective water temperature sensor
(Black smoke from exhaust)
S Defective mass air-flow meter
S Faulty ECM
S Faulty injectors
S Faulty throttle position sensor

2005 SIENNA REPAIR MANUAL (RM1163U)

Author : Date : 2303

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