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Engine Mechanical (Service Information): Overview Lexus IS III

Mechanical 2 illustrations ~1601 words

Scheme 31

Scheme 31: PROCEDURE
Scheme 31: PROCEDURE
  1. INSPECT ENGINE COOLANT Refer to «REPLACEMENT [04/2013 - ]»(ref-665707-S15789455382014102400000)
  2. INSPECT ENGINE OIL Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(/lexus/is/iii-2013-2016/remont/lubrication-system/#lubrication-system-inspection)
  3. CHECK BATTERY CONDITION Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(ref-665711-S19112603242014102400000)
  4. CHECK SPARK PLUG Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(/lexus/is/iii-2013-2016/remont/ignition-system/#ignition-system-inspection)
  5. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Remove the air cleaner filter element sub-assembly. Visually check that the air cleaner filter element sub-assembly is not excessively damaged or oily. HINT: If necessary, replace the air cleaner filter element sub-assembly. If there is any dirt or clogs in the air cleaner filter element sub-assembly, clean it with compressed air. If any dirt or clogs remain even after cleaning the air cleaner filter element sub-assembly with compressed air, replace it. Install the air cleaner filter element sub-assembly.
  6. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY Remove the V-ribbed belt. Refer to «REMOVAL [04/2013 - ]»(ref-665703-S25978130992014102400000) Check that nothing is caught in the V-ribbed belt tensioner assembly by turning it clockwise and counterclockwise. HINT: If a malfunction exists, replace the V-ribbed belt tensioner assembly. Install the V-ribbed belt. Refer to «INSTALLATION [04/2013 - ]»(ref-665703-S21534369332014102400000)
  7. INSPECT VALVE LASH ADJUSTER ASSEMBLY NOISE Rev up the engine several times. Check that the engine does not emit unusual noises. If unusual noises occur, warm up the engine and idle it for 30 minutes or more, then perform the preceding inspection. HINT: If any defects or problems are found during the preceding inspection, perform valve lash adjuster assembly inspection. See step 2
  8. INSPECT IGNITION TIMING Warm up and stop the engine. HINT: A warmed up engine should have an engine coolant temperature of over 80°C (176°F), an engine oil temperature of 60°C (140°F), and the engine speed should be stabilized. When using the Techstream: Check the ignition timing. Connect the Techstream to the DLC3. Start the engine and run it at idle. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / IGN Advance. Powertrain > Engine > Data List Tester Display IGN Advance Standard Ignition Timing 7 to 17° BTDC at idle NOTE: Check the ignition timing with the cooling fans off. Turn off all electrical systems and the A/C. When checking the ignition timing, the transmission should be in neutral or park. Check that the ignition timing advances immediately when the engine speed is increased. Enter the following menus: Powertrain / Engine / Active Test / Connect the TC and TE1 / ON. Powertrain > Engine > Active Test Active Test Display Connect the TC and TE1 Data List Display IGN Advance Monitor IGN Advance. Perform the Active Test. Standard Ignition Timing 8 to 12° BTDC at idle NOTE: When checking the ignition timing, the transmission should be in neutral or park. When not using the Techstream: Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3. *a DLC3 SST: 09843-18040 NOTE: Confirm the terminals before connecting them. Connecting the wrong terminals may result in damage to electrical components. Check the ignition timing with the cooling fans off. Turn off all the electrical systems and the A/C. When checking the ignition timing, the transmission should be in neutral or park. Remove the V-bank cover sub-assembly. See step 3 Connect the timing light probe to the ignition coil wire for the No. 1 cylinder. NOTE: Use a timing light that detects primary signals. Start the engine and run it at idle. Check the ignition timing at idle. Standard Ignition Timing 8 to 12° BTDC at idle NOTE: When checking the ignition timing, the transmission should be in neutral or park. HINT: Run the engine at 1000 to 1300 rpm for 5 seconds, and then check that the engine rpm returns to engine idle speed. Disconnect terminals 13 (TC) and 4 (CG) of the DLC3. Check the ignition timing at idle. Standard Ignition Timing 7 to 17° BTDC at idle Confirm that the ignition timing advances immediately when the engine idle speed is increased. Remove the timing light probe from the engine. Install the V-bank cover sub-assembly. See step 104
  9. INSPECT ENGINE IDLE SPEED Warm up and stop the engine. HINT: A warmed up engine should have an engine coolant temperature of over 80°C (176°F), an engine oil temperature of 60°C (140°F), and the engine idle speed should be stabilized. When using the Techstream: Connect the Techstream to the DLC3. Start the engine and run it at idle. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Engine Speed. Powertrain > Engine > Data List Tester Display Engine Speed Read the value displayed on the tester. Standard Idle Speed 650 to 750 rpm NOTE: Check the idle speed with the cooling fans off. Turn off all the electrical systems and the A/C. When checking the engine idle speed, the transmission should be in neutral or park. When not using the Techstream: Using SST, connect a tachometer probe to terminal 9 (TAC) of the DLC3. *a DLC3 NOTE: Be sure to connect the tachometer to the correct terminal. Connecting the wrong terminals can cause damage to electrical components. SST: 09843-18030 Turn the engine switch ON (IG). Inspect the engine idle speed. Standard Idle Speed 650 to 750 rpm NOTE: Check the engine idle speed with the cooling fans off. Turn off all the electrical systems and the A/C. When checking the engine idle speed, the transmission should be in neutral or park. Turn the engine switch off. Disconnect the tachometer probe from terminal 9 (TAC) of the DLC3.
  10. INSPECT COMPRESSION NOTE: Keep the intake manifold and spark plug holes free of foreign matter when measuring the compression pressure. Warm up and stop the engine. HINT: A warmed up engine should have an engine coolant temperature of over 80°C (176°F), an engine oil temperature of 60°C (140°F), and the engine idle speed should be stabilized. Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665554-S38092923772014102400000) Remove the 6 spark plugs. Refer to «PROCEDURE - Step 3»(ref-665751-S23724193242014102400000) Remove the cool air intake duct seal. Refer to «PROCEDURE - Step 1»(ref-665772-S17684216972014102400000) Remove the inlet No. 1 air cleaner. See step 20 Disconnect the throttle with motor body connector. Disconnect the 2 injector driver connectors as shown in the illustration. *a Release *b Move Check the cylinder compression pressure. Insert a compression gauge into the spark plug hole. Fully open the throttle. While cranking the engine, measure the compression pressure. Standard Compression Pressure 1400 kPa (14.3 kgf/cm 2, 203 psi) Minimum Compression Pressure 980 kPa (10.0 kgf/cm 2, 142 psi) Pressure Difference between each Cylinder 100 kPa (1.0 kgf/cm 2, 15 psi) or less NOTE: Always use a fully charged battery to obtain an engine speed of 250 rpm or more. Inspect the other cylinders in the same way. Measure the compression pressure as quickly as possible. 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 engine 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. Connect the 2 injector driver connectors as shown in the illustration. *a Move Connect the throttle with motor body connector. Install the inlet No. 1 air cleaner. See step 74 Install the cool air intake duct seal. Refer to «PROCEDURE - Step 3»(ref-665772-S40987981332014102400000) Install the 6 spark plugs. Refer to «PROCEDURE - Step 1»(ref-665751-S29802334862014102400000) Clear the DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665554-S38092923772014102400000) NOTE: After the inspection, clear the DTCs, check for DTCs again and make sure the normal system code is output.
  11. INSPECT CO/HC HINT: This check determines whether the idle CO/HC complies with regulations. Start the engine. Keep the engine speed at 2500 rpm for approximately 180 seconds. Insert a CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idle. Immediately check the CO/HC concentration during idle and when the engine is running at 2500 rpm. HINT: When performing the 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. Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665554-S38092923772014102400000) See the following table for possible causes, then inspect and correct the applicable causes if necessary. CO HC Problem Cause Normal High Rough idle Faulty ignition: Incorrect valve timing Fouled, shorted or improperly gapped spark plugs Incorrect valve clearance (valve lash adjuster assembly) Leaks in intake or exhaust valves Leaks in cylinders Low High Rough idle (Fluctuating HC reading) Vacuum leaks: PCV hoses Intake manifold Throttle with motor body assembly Lean mixture causing misfire High High Rough idle (Black smoke from exhaust) Restricted air cleaner filter element sub-assembly Plugged PCV valve Faulty SFI system: Fuel pressure regulator assembly Engine coolant temperature sensor Mass air flow meter sub-assembly ECM Fuel injector assemblies Throttle position sensor (built in throttle with motor body assembly)

Scheme 32

Scheme 32: ILLUSTRATION
Scheme 32: ILLUSTRATION

*1 V-BANK COVER SUB-ASSEMBLY *2 INLET NO. 1 AIR CLEANER *3 COOL AIR INTAKE DUCT SEAL *4 V-RIBBED BELT N*m (kgf*cm, ft.*lbf): Specified torque

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