Toyota Highlander manuals

Toyota Highlander Service Manual: Engine (3MZ-FE)

INSPECTION

1. INSPECT ENGINE COOLANT (See page 16-20 )

2. INSPECT ENGINE OIL

3. INSPECT BATTERY (See page 19-36 )

4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSY

5. INSPECT SPARK PLUG (See page 18-9 )

6. INSPECT V-RIBBED BELT

 INSPECT V-RIBBED BELT


(a) Using a belt tension gauge, check the belt tension.

Belt tension gauge: DENSO BTG-20 (95506-00020) Borroughs No. BT-33-73F

Drive belt tension:

 INSPECT V-RIBBED BELT


 INSPECT V-RIBBED BELT


HINT:

7. INSPECT IGNITION TIMING

(a) Warm up the engine.

INSPECT IGNITION TIMING


(b) When using the hand-held tester: Check the ignition timing.

  1.  Connect the hand-held tester to the DLC3.
  2.  Enter DATA LIST MODE on the hand-held tester.

Ignition timing: 8 to 12 BTDC @ idle

HINT: Please refer to the hand-held tester operator's manual for further details.

INSPECT IGNITION TIMING


(c) When not using the hand-held tester: Check the ignition timing.

  1.  Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

SST 09843-18040

NOTICE:

  1.  Remove the V-bank cover (see page 14-149 ).

INSPECT IGNITION TIMING


  1. Pull out the black lead wire harness as shown in the illustration.
  2.  Connect the tester terminal of the timing light to the engine.

NOTICE: Use a timing light which detects the first signal.

  1.  Check the ignition timing at idle.

Ignition timing: 8 to 12 BTDC @ idle

NOTICE: When checking the ignition timing, the transmission should be in the neutral position.

HINT: Run the engine at 1,000 to 1,300 rpm for 5 seconds, and then check that the engine rpm returns to idle speed.

  1.  Remove the SST from the DLC3.
  2.  Check the ignition timing at idle.

    Ignition timing: 7 to 24 BTDC @ idle

  3.  Confirm that the ignition timing moves to the advanced angle side when the engine rpm is increased.
  4.  Remove the timing light.

8. INSPECT ENGINE IDLE SPEED

(a) Warm up the engine.

INSPECT ENGINE IDLE SPEED


(b) When using the hand-held tester: Check the idle speed.

  1.  Connect the hand-held tester to the DLC3.
  2.  Enter DATA LIST MODE on the hand-held tester.

    Idle speed: 650 to 750 rpm

NOTICE:

INSPECT ENGINE IDLE SPEED


HINT: Please refer to the hand-held tester operator's manual for further details.

(c) When not using the hand-held tester: Check the idle speed.

  1.  Using SST, connect tachometer tester probe to terminal 9 (TAC) of the DLC3.

    SST 09843-18030

  2.  Check the idle speed.

Idle speed: 650 to 750 rpm

9. INSPECT COMPRESSION

(a) Warm up and stop the engine.

(b) Disconnect the injector connectors.

(c) Remove the intake air surge tank (see page 10-20 ).

(d) Remove the 6 ignition coils.

(e) Remove the 6 spark plugs.

INSPECT COMPRESSION


(f) Check the cylinder compression pressure.

SST 09992-00500

  1.  Insert a compression gauge into the spark plug hole.
  2. Fully open the throttle.
  3. While cranking the engine, measure the compression pressure.

Compression pressure: 1.5 MPa (15.3 kgf/cm2, 218 psi)

Minimum pressure: 1.0 MPa (10.2 kgf/cm2, 145 psi)

Difference between each cylinder: 100 kPa (1.0 kgf/cm2, 15 psi)

NOTICE:

  1.  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:

10. INSPECT CO/HC

(a) Start the engine.

(b) Rev the engine at 2,500 rpm for approximately 180 seconds.

(c) Insert CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.

(d) Check CO/HC concentration at idle and/or 2,500 rpm.

HINT: Check regulations and restrictions in your area when performing 2 mode CO/CH concentration testing (engine check at both idle speed and at 2,500 rpm).

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

  1.  Check A/F sensor operation (see page 05-649 ).
  2.  See the table below for possible causes, and then inspect and repair.

CO

HC

Problems

Causes

Normal High Rough idle
  1. Faulty ignitions:
  • Incorrect timing
  • Fouled, shorted or improperly gapped plugs
  1.  Incorrect valve clearance
  2. Leaks in intake and exhaust valves
  3.  Leaks in cylinders
Low High Rough idle (fluctuating HC reading)
  1. Vacuum leaks:
  • PCV hoses
  • Intake manifold
  • Throttle body
  • Brake booster line
  1.  Lean mixture causing misfire
High High Rough idle (black smoke from exhaust)
  1. Restricted air filter
  2. Plugged PCV valve
  3.  Faulty SFI system:
  • Faulty fuel pressure regulator
  • Defective ECT sensor
  • Defective MAF meter
  • Faulty ECM
  • Faulty injectors
  • Faulty throttle position sensor
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