LEXUS LS430 2003 Factory Repair Manual

Fig. 2: Identifying Proper Ribbed Grooves
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
7.INSPECT IGNITION TIMING
a. Warm up the engine.
b. Check the ignition timing.
1. Connect the hand-held tester (with CAN VIM) to the DLC3.
2. Enter DATA LIST MODE on the hand-held tester.
Ignition timing 8 to 12° BTDC @ idle
HINT:
Please refer to the han
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51[g the DATA LIST.

Fig. 3: Checking Ignition Timing Connecting Hand-Held Tester DLC3
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8.INSPECT ENGINE IDLE SPEED
a. Warm up the engine.
b. Check the idle speed.
1. Connect the hand-held tester (with CAN VIM) to the DLC3.
2. Enter DATA LIST MODE on the hand-held tester.
Idle speed: 700 to 800 rpm

Fig. 4: Checking Engine Idle Speed Connecting Hand-Held Tester DLC3
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HINT:
Please refer to the hand-held tester operator's manual for further details.
9.INSPECT COMPRESSION
a. Remove the V-bank cover.
b. Remove the air cleaner inlet and intake air pipe.
c. Disconnect the throttle control motor connector.
d. Remove the oil level gauge guide.
e. Remove the 8 i
gnition coils.

f. Remove the spark plugs.
g. Disconnect the 8 injector connectors.
h. Check the cylinder compression pressure.
SST 09992-00500
1. Insert a compression gauge into the spark plug hole.
2. Fully open the throttle.
3. While cranking the engine, measure the compression pressure.
Compression pressure:
1.2 MPa (12.5 kgf/cm
2 , 178 psi)
Minimum pressure: 981 kPa (10.0 kgf/cm
2 , 142 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm
2 , 14 psi)
4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder
throu
gh the spark plug hole and inspect again.

Fig. 5: Checking Cylinder'S Compression Pressure
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HINT:
If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or
damaged.
If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in
the gasket.
i. Connect the 8 injector connectors.
j. Install the spark plugs.
k. Install the 8 ignition coils.
l. Install the oil level gauge guide.
m. Connect the throttle control motor connector.
n. Install the air cleaner inlet and intake air pipe.
o. Install the V-bank cover.
10.INSPECT CO/HC
a. Start the engine.
b. Rev the engine at 2,500 rpm for approximately 180 seconds.

c. Insert CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.
d. Check CO/HC concentration at idle and/or 2,500 rpm.
HINT:
Complete the measuring within 3 minutes.
Check regulations and restrictions in your area when performing 2 mode CO/HC
concentration testing (engine check at both idle speed and at 2,500 rpm).
e. If the CO/HC concentration does not comply with regulations, troubleshoot in the order given
below.
1. Check heated oxygen sensor operation (see DTC P0130, P0150, P2195, P2196, P2197, P2198:
OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1), OXYGEN SENSOR CIRCUIT
MALFUNCTION (BANK 2 SENSOR 1), OXYGEN SENSOR SIGNAL STUCK LEAN
(BANK 1 SENSOR 1)/ (BANK 2 SENSOR 1), OXYGEN SENSOR SIGNAL STUCK RICH
(BANK 1 SENSOR and DTC P0133, P0153: OXYGEN SENSOR CIRCUIT SLOW
RESPONSE (BANK 1 SENSOR 1)/ (BANK 2 SENSOR 1) ).
2. See the table on the next page for possible causes, and then inspect and repair.
Fig. 6: Checking CO/HC Concentration

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Fig. 7: CO/HC Symptom Reference Chart
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REPLACEMENT
1.REMOVE AIR CLEANER INLET NO.1
2.REMOVE FAN AND GENERATOR V BELT
a. Loosen the belt tension by turning the belt tensioner counterclockwise, and remove the V belt.
HINT:
The tension pulle
y has a left-hand thread.

Fig. 8: Removing Fan And Generator V Belt
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3.INSTALL FAN AND GENERATOR V BELT
a. Set the V belt to everything except the idler pulley No. 2, as shown in the illustration.
b. Loosen the V belt by turning the belt tensioner counterclockwise.
c. Then set the V belt to the idler pulle
y.

Fig. 9: Installing Fan And Generator V Belt
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d. After a new belt has been installed, check that the mark is within range B as shown in the
illustration.

Fig. 10: Locating Mark
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4.INSTALL AIR CLEANER INLET NO.1
ADJUSTMENT
1.REMOVE V-BANK COVER
2.REMOVE CYLINDER HEAD COVER SUB-ASSY (See REPLACEMENT
)
3.REMOVE CYLINDER HEAD COVER SUB-ASSY LH (See REPLACEMENT
)
4.SET NO. 1 CYLINDER TO TDC/COMPRESSION
a. Turn the crankshaft damper, and align its groove with timing mark "0" of the timing belt No. 1
cover.