Lexus ES: On-vehicle Inspection

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

To prevent injury due to contact with an operating V-ribbed belt or cooling fan, keep your hands and clothing away from the V-ribbed belt and cooling fan when working in the engine compartment with the engine running or the ignition switch ON.

NOTICE:

This procedure includes the removal/installation of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts.

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PROCEDURE

1. INSPECT ENGINE COOLANT

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2. INSPECT ENGINE OIL

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3. INSPECT BATTERY CONDITION

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4. INSPECT SPARK PLUG

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5. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

(a) Remove the air cleaner filter element sub-assembly.

(b) Visually check that the air cleaner filter element sub-assembly is not damaged or excessively oily. If necessary, replace the air cleaner filter element sub-assembly.

(c) Install the air cleaner filter element sub-assembly.

6. INSPECT V-RIBBED BELT

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7. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY

(a) Remove the V-ribbed belt.

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(b) Turn the V-ribbed belt tensioner assembly clockwise and counterclockwise and check that it turns smoothly and does not catch.

HINT:

If the V-ribbed belt tensioner assembly does not turn smoothly or catches, replace the V-ribbed belt tensioner assembly.

(c) Install the V-ribbed belt.

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8. INSPECT VALVE LASH ADJUSTER ASSEMBLY NOISE

(a) Rev up the engine several times. Check that the engine does not emit unusual noises.

(b) If unusual noises occur, warm up the engine and idle it for 30 minutes or more, then perform the inspection.

HINT:

If any defects or problems are found during the inspection, perform the valve lash adjuster assembly inspection.

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9. INSPECT IGNITION TIMING

(a) Warm up and stop the engine.

(b) Connect the Techstream to the DLC3.

(c) Start the engine and run it at idle.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / Ignition Timing Cylinder #1.

Standard Ignition Timing:

0 to 15° BTDC at idle

(f) Enter the following menus: Powertrain / Engine / Active Test / Activate the TC Terminal / ON.

(g) Monitor Ignition Timing Cylinder #1 of the Data List.

Standard Ignition Timing:

8 to 12° BTDC at idle

(h) Enter the following menus: Powertrain / Engine / Active Test / Activate the TC Terminal / OFF.

(i) Check that the ignition timing advances immediately when the engine speed is increased.

10. INSPECT ENGINE IDLE SPEED

(a) Warm up and stop the engine.

(b) Connect the Techstream to the DLC3.

(c) Start the engine and run it at idle.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / Engine Speed.

(f) Read the value displayed on the tester.

Standard Idle Speed:

600 to 700 rpm

11. INSPECT COMPRESSION

NOTICE:

Keep the spark plug holes free of foreign matter when measuring the compression pressure.

(a) Warm up and stop the engine.

(b) Check for DTCs.

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(c) Remove the No. 1 engine cover sub-assembly.

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(d) Remove the front wheel opening extension pad LH.

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(e) Remove the front wheel opening extension pad RH.

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(f) Remove the No. 1 engine under cover.

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(g) Remove the No. 2 engine under cover assembly.

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(h) Remove the 4 spark plugs.

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(i) Disconnect the fuel injector connector (for Port Injection).

(j) Disconnect the fuel injector connector (for Direct Injection).

(k) Remove the air cleaner cap with air cleaner hose.

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(l) Using an 8 mm socket wrench, remove the 3 bolts to disconnect the throttle body with motor assembly from the intake manifold.

(m) Remove the throttle body gasket from the intake manifold.

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(n) Check the cylinder compression pressure. (1) Insert a compression gauge into the spark plug hole. (2) While cranking the engine, measure the compression pressure. Standard Compression Pressure: 1500 kPa (15.3 kgf/cm2, 218 psi) Minimum Compression Pressure: 1300 kPa (13.3 kgf/cm2, 189 psi) Pressure Difference between Each Cylinder: 200 kPa (2.0 kgf/cm2, 29 psi) or less NOTICE: Always use a fully charged battery to obtain an engine speed of 250 rpm or more. Inspect all cylinders in the same way. Measure the compression pressure as quickly as possible. (3) If the cylinder compression pressure is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect it again. HINT: If adding oil increases the compression pressure, the piston rings and/or cylinder bore may be worn or damaged. If the compression pressure stays low, a valve may be stuck or seated improperly, or there may be leaks in the cylinder head gasket.

(o) Install a new throttle body gasket to the intake manifold.

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(p) Using an 8 mm socket wrench, connect the throttle body with motor assembly to the intake manifold with the 3 bolts. Torque: 10 N·m {102 kgf·cm, 7 ft·lbf}

(q) Install the air cleaner cap with air cleaner hose.

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(r) Connect the fuel injector connector (for Direct Injection).

(s) Connect the fuel injector connector (for Port Injection).

(t) Install the 4 spark plugs.

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(u) Install the No. 2 engine under cover assembly.

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(v) Install the No. 1 engine under cover.

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(w) Install the front wheel opening extension pad LH.

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(x) Install the front wheel opening extension pad RH.

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(y) Install the No. 1 engine cover sub-assembly.

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(z) Clear the DTCs.

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NOTICE:

After the inspection, clear the DTCs, check for DTCs again and make sure the normal system code is output.

12. INSPECT CO/HC

HINT:

This check determines whether or not the idle CO/HC complies with regulations.

(a) Start the engine.

(b) Run the engine at 2500 rpm for approximately 180 seconds.

(c) Insert a CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idle.

(d) Immediately check the CO/HC concentration during idle and when the engine is running at 2500 rpm.

HINT:

When performing a 2 mode (with the engine idling/running at 2500 rpm) test, the measurement procedures are determined by applicable local regulations.

If the CO/HC concentration does not comply with the regulations, perform troubleshooting in the order given below.

(1) Check for DTCs.

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(2) See the following table for possible causes, then inspect the applicable parts and repair them if necessary.

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