Engine (3MZ-FE): Inspection

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT ENGINE COOLANT (See INSPECTION )
INSPECT ENGINE OIL
INSPECT BATTERY (Standard specific gravity: 1.25 to 1.29 at 20°C (68°F)
INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSY
INSPECT SPARK PLUG (See INSPECTION )
INSPECT V-RIBBED BELT
1. Belt deflection:
  Pressing force: 98 N (10 kgf, 22 lbf)
  
  Fig 1: Identifying Belt Deflection Points
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Belt Deflection Specification Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Belt tension:
  
  Fig 3: Belt Tension Specification Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - Check the drive belt deflection at the specified point.
  - When installing a new belt, set its tension value as specified.
  - When inspecting a belt which is used for over 5 minutes, apply the specification of "Used belt".
  - When reinstalling a belt which is used for over 5 minutes, adjust its belt deflection and tension to the intermediate value of each specification in "Used belt".
  - The V-ribbed belt tension and deflection value should be checked after 2 revolutions of engine cranking.
  - When using a belt tension gauge, confirm the accuracy first by using a master gauge.
INSPECT IGNITION TIMING
1. Warm up engine.
2. When using the hand-held tester or OBD II scan tool:
  1. Connect the hand-held tester or OBD II scan tool to the DLC3.
  2. Enter DATA LIST MODE on the hand-held tester or OBD II scan tool.
    Ignition timing: 8 to 12° BTDC
    
    HINT:
    
    Refer to the hand-held tester or OBD II scan tool operation's manual if you need help to select DATA LIST.
3. When not using the hand-held tester or OBD II scan tool:
  1. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.
    SST 09843-18040
    
    Fig 4: Identifying DLC3 Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE:
    Make sure of the terminal numbers before connecting them. Connecting wrong terminals can damage the engine.
    
    Turn OFF all electrical systems before connecting the terminals.
    
    Perform this inspection after the cooling fan motor is turned OFF.
  2. Remove the V-bank cover.
  3. Pull out the engine wire colored by black and red as shown in the illustration.
  4. Connect the tester terminal of the timing light to the engine.
    NOTE: Use a timing light which detects the first signal.
  5. Inspect the ignition timing at idle.
    Ignition timing: 8 to 12Ω BTDC
    
    NOTE: When checking the ignition timing, the transmission is in the neutral position.
    
    HINT:
    
    Run the engine at 1,000 to 1,300 rpm for 5 seconds, then check that the engine speed returns to the idle speed.
  6. Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.
  7. Inspect the ignition timing at idle.
    ignition timing: 7 to 24° BTDC
  8. Confirm that the ignition timing advances when the engine speed is increased.
  9. Remove the timing light.
INSPECT ENGINE IDLE SPEED
1. Warm up the engine.
2. When using the hand-held tester or OBD II scan tool:
  1. Connect the hand-held tester or OBD II scan tool:DLC3.
  2. Enter DATA LIST MODE on the hand-held tester or OBD II scan tool.
    Idle speed: 630 to 730 rpm.
    NOTE:
    When checking the idle speed, the transmission is in the natural position.
    
    Check the idle speed with the cooling fan OFF.
    
    Switch OFF all accessories and air conditioning before connecting the hand-held or OBD II scan tool.
    HINT:
    
    Refer to the hand-held tester or OBD II scan tool operator's manual for further details.
INSPECT COMPRESSION
1. Warm up and stop the engine.
2. Remove the intake air surge tank (see REPLACEMENT ).
3. Disconnect the injector connectors.
4. Remove the ignition coils.
5. Remove the spark plugs.
6. Inspect the cylinder compression pressure.
  1. Insert a compression gauge into the spark plug hole.
    SST 09992-00500
  2. Fully open the throttle.
  3. While cranking the engine, measure the compression pressure.
    Compression pressure: 1.5 MPa (15.3 kgf/cm ² , 218 psi)
    
    Minimum pressure:
    
    1.0 MPa (10.2 kgf/cm ² , 124 psi)
    
    Difference between each cylinder:
    
    100 kPa (1.0 kgf/cm ² , 15 psi)
    NOTE:
    Always use a fully-charge battery to obtain engine speed of 250 rpm or more.
    
    Check the other cylinder's compression pressure in the same way.
    
    This measurement must be done as quickly as possible.
  4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole, then inspect again.
    HINT:
    - If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
    - If pressure stays low, the valve may be sticking or seated improperly, or there may be leakage past the gasket.
INSPECT CO/HC
HINT:

The ECM properly controls the CO/HC concentration in the emission gas.
1. Start the engine.
2. Run the engine at 2,500 rpm for approximately 180 seconds.
3. Insert the CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.
4. Check the CO/HC concentration at idle and/or at 2,500 rpm.
  HINT:
  
  When doing the 2 mode (with the engine is at idle and at 2,500 rpm) tests, these measuring order are prescribed by the applicable local regulations.
  
  If the CO/HC concentration does not comply with the regulations, troubleshoot in the order given below.
  1. Check the heated oxygen sensor operation (see DTC P0136: OXYGEN SENSOR CIRCUIT MALFUNCTION ).
  2. See the figure Fig 7 below for possible causes, then inspect the applicable causes and repair them if necessary.
    
    Fig 7: CO/HC Problem Symptom Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002