2003 LEXUS LS430 engine

Fig. 5: Checking Cylinder'S Compression Pressure
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 19: Exploded View Of Partial Engine Assy Components (1 Of 15)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 20: Exploded View Of Partial Engine Assy Components (2 Of 15)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 21: Exploded View Of Partial Engine Assy Components (3 Of 15)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 22: Exploded View Of Partial Engine Assy Components (4 Of 15)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 23: Exploded View Of Partial Engine Assy Components (5 Of 15)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 24: Exploded View Of Partial Engine Assy Components (6 Of 15)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 25: Exploded View Of Partial Engine Assy Components (7 Of 15)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.