Section 151 (Engine Assembly (Inspection)): Inspection

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

INSPECT COOLANT, see ON-VEHICLE 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-ASSEMBLY
INSPECT SPARK PLUG, see INSPECTION .

Fig 1: Measuring Point For Belts Looseness
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT V-RIBBED BELT

Belt deflection:

Pressing force: 98 N (10 kgf, 221 lbf)

BELT DEFLECTION

	New belt mm (in.)	Used belt mm (in.)
V ribbed belt (For fan and generator)	9.1 to 10.5 (0.358 to 0.413)	11.0 to 13.5 (0.433 to 0.531)
V ribbed belt (for vane pump)	8 to 10 (0.315 to 0.394)	11 to 14 (0.433 to 0.551)

Tension:

TENSION

	New belt N (kg, lb)	Used belt N (kg, lb)
V ribbed belt (for fan and generator)	617 to 853 (63 to 87, 139 to 192)	294 to 490 (30 to 50, 66 to 110)
V ribbed belt (for vane pump)	588 to 686 (60 to 70, 132 to 154)	245 to 392 (25 to 40, 55 to 88)

NOTE:

Check the drive belt deflection at the specified point.
When installing a new belt, set its tension value as specified.
When checking a belt used for over 5 minutes, confirm the deflection value is within the specified one.
When reinstalling a belt used for over 5 minutes, perform the check based on the used deflection value.
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 hand-held tester.
  1. Connect the hand-held tester to the DLC3.
  HINT:
  
  Please refer to the hand-held tester operator's manual for further details.
  
  Ignition timing : 8 to 12° BTDC
3. When not using hand-held tester.
  1. Using SST, connect terminals 13 (TC) and 4 (CG) of DLC3.
    SST 09843-18040
    
    Fig 2: Connecting Terminals (TC) And (CG) Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE:
    Be careful not to connect incorrectly. It causes breakage of the engine.
    
    Turn OFF all electrical systems.
    
    Operate the inspection when the cooling fan motor is turned OFF.
  2. Remove the V-bank cover.
  3. Pull out the wire harness as shown. Connect the clip of the timing light to the engine.
    NOTE: Use a timing light which can detect the first signal.
    
    Fig 3: Connecting Clip Of The Timing Light To The Engine
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Inspect ignition timing at idle.
    Ignition timing : 8 to 12° BTDC
    
    NOTE: When checking the ignition timing, the transmission is in neutral position.
    
    HINT:
    
    After engine RPM is kept at 1,000 to 1,300 RPM. for 5 seconds, check that it returns idle speed.
  5. Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.
  6. Inspect ignition timing at idle.
    Ignition timing : 7 to 24° BTDC
  7. Confirm that ignition timing moves to advanced angle when the engine RPM is increased.
  8. Remove the timing light.
INSPECT ENGINE IDLE SPEED
1. Warm up the engine.
2. When using hand-held tester.
  1. Connect the hand-held tester to the DLC3.
  Fig 4: Connecting Tachometer Test Prove To Terminal (TAC) Of DlC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Idle speed: 550 to 650 RPM.
  
  HINT:
  
  Please refer to the hand-held tester operator's manual for further details.
3. When not using hand-held tester.
  1. Using SST, connect the tachometer test prove to terminal 9 (TAC) of DLC3.
    SST 09843-18040
  2. Check the idle speed.
  Idle speed: 550 to 650 RPM.
  NOTE:
  - Check idle speed with cooling fan OFF.
  - Switch off all accessories and air conditioning.
INSPECT COMPRESSION
1. Stop a warm engine.
2. Disconnect the injector connectors.
3. Remove the intake air surge tank. See ADJUSTMENT .
4. Remove the ignition coil.
5. Remove the spark plugs.
6. Inspect cylinder compression pressure.
  SST 09992-00500
  1. Insert a compression gauge into the spark plug hole.
  2. 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 , 145 psi)
    
    Difference between each cylinder:
    
    100 kPa (1.0 kgf/cm ² , 15 psi)
    NOTE:
    Always use a fully charged battery to obtain engine speed of 250 RPM or more.
    
    Check other cylinder's compression pressure in the same way.
    
    This measurement must be done in as short a time as possible.
  3. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again.
  HINT:
  - If adding oil increases the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
  - If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past the gasket.
INSPECT CO/HC
1. Start the engine.
2. Race the engine at 2,500 RPM. for approx. 180 seconds.
3. Insert CO/HC meter testing probe at least 40 cm (1.3 ft) into tailpipe during idling.
4. Immediately check CO/HC concentration at idle and/or 2,500 RPM.
  HINT:
  - Complete the measuring within 3 minutes.
  - When doing the 2 mode (idle and 2,500 RPM) test, the procedure may vary according to local regulations.
5. If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below.
  1. Check heated oxygen sensor operation. See INSPECTION .
  2. See "Symptom Table" for possible causes, and then inspect and correct the applicable causes if necessary.
    
    Fig 6: Symptom Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002