2003 LEXUS LS430 check engine

OK:
As shown in the illustration
HINT:
As vehicle speed increases, the cycle of the signal waveform narrows.
Fig. 88: Identifying Signal Waveform

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3.INSPECT TACHOMETER
a. Check operation
b. Connect the tune-up test tachometer and start the engine.
Vehicle conditionDriving at approx. 20 Km/h (12 mph)

ON-VEHICLE INSPECTION
1.CHECK COOLING SYSTEM FOR LEAKS
a. Fill the radiator with coolant and attach a radiator cap tester.
Fig. 1: Checking Cooling System For Leaks

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b. Warm up the engine.
c. Using a radiator cap tester, increase the pressure inside the radiator to 137 kPa (1.4 kgf/cm
2, 19.9

psi), and check that the pressure does not drop.
If the pressure drops, check the hoses, radiator and water pump for leaks. If no external leaks are found,
check the heater core, cylinder block and head.
2.CHECK ENGINE COOLANT LEVEL AT RESERVOIR
a. Check that the engine coolant level is between the LOW and FULL lines when the engine is cold.
If the engine coolant is low, check for leaks and add "TOYOTA Super Long Life Coolant" to the
FULL line.
If "TOYOTA Super Long Life Coolant" is not available, use a similar high quality ethylene glycol
based non-silicate, non-amino, non-nitrite and non-borate coolant with long-life hybrid organic acid
technology. Do not substitute plain water for engine coolant.
3.CHECK ENGINE COOLANT QUALITY
a. Remove the radiator cap.
b. Check if there are any excessive deposits of rust or scale around the radiator cap and radiator filler
hole, Also, the coolant should be free from oil.
HINT:
If excessively dirty, clean the coolant passage and replace the coolant.
c. Reinstall the radiator cap.
INSPECTION
1. INSPECT THERMOSTAT
HINT:
The thermostat is stamped with the valve openin
g temperature.

ON-VEHICLE INSPECTION
1.CHECK COOLING FAN SYSTEM
a. Look at the chart below. Check that when the cooling fan is in the condition on the left, its
operation is what is written on the right.
Standard when engine coolant temperature is below 82°C (180°F):
CONDITION AND OPERATION SPECIFICATION
If the fan does not operate as specified, proceed to next step.
2.INSPECT COOLING FAN MOTOR
a. Remove the air cleaner inlet No. 1.
b. Disconnect the 2 connectors.
c. Connect the battery and ammeter.
d. Check that the fan rotates smoothly, and then check the amperage on the ammeter.
Standard: 9.2 to 11.0 A at 20° C (68° F)
If the result is not as specified, replace the fan motor.
If the fan operates, proceed to the next step.
ConditionOperation (Fan Speed)
Ignition ON at engine stoppingNot rotating
A/C switch OFF at idle speedNot rotating
A/C switch ON at idle speedRotating (Low speed)
Disconnect ECT sensor connector at idle speedRotating (High speed)

Fig. 14: Adding Coolant To Full Line For Radiator And Reservoir
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5.CHECK FOR ENGINE COOLANT LEAKS
6.INSTALL AIR CLEANER INLET NO.1 (See REPLACEMENT
)
7.INSTALL V-BANK COVER
COMPONENTS

Fig. 21: Installing Water Inlet Housing With Bolts
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11.INSTALL TIMING BELT IDLER SUB-ASSY NO.2 (See OVERHAUL
)
12.INSTALL TIMING BELT (See REPLACEMENT
)
13.INSTALL RADIATOR ASSY (See REPLACEMENT
)
14.REFILL ENGINE COOLANT (See REPLACEMENT
)
15.CONNECT BATTERY NEGATIVE TERMINAL
16.CHECK FOR ENGINE COOLANT LEAKS (See ON
-VEHICLE INSPECTION )
17.INSTALL ENGINE UNDER COVER NO.1
INSPECTION
1.INSPECT WATER PUMP ASSY
a. Visuall
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4e0044[ge.

If leakage is found, replace the water pump and timing belt.
b. Turn the pulley, and check that the water pump bearing moves smoothly and quietly.
If it moves roughly or noisily, replace the water pump.
Fig. 22: Inspecting Water Pump Assy

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REPLACEMENT
1.REMOVE AIR CLEANER INLET NO.1 (See REPLACEMENT
)
2.DRAIN ENGINE COOLANT (See REPLACEMENT
)
3.REMOVE THERMOSTAT
a. Remove the 3 nuts and disconnect the water inlet from the water inlet housing.
b. Remove the thermostat.
c. Remove the
gasket from the thermostat.

Fig. 25: Installing Water Inlet With Nuts
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5.REFILL ENGINE COOLANT (See REPLACEMENT
)
6.CHECK FOR ENGINE COOLANT LEAKS (See ON
-VEHICLE INSPECTION )
7.INSTALL AIR CLEANER INLET NO.1 (See REPLACEMENT
)
ON-VEHICLE CLEANING
1.INSPECT FINS BLOCKAGE
a. Check that the radiator and condenser are not blocked with leaves, dirt, or insects. Clean the hose
connection.
If the fins are clo
gged, wash them with water or a steam cleaner and dry with compressed air.