Toyota Highlander manuals

Toyota Highlander Service Manual: Engine (2AZ-FE)

INSPECTION

1. INSPECT ENGINE COOLANT (See page 16-6 )

2. INSPECT ENGINE OIL

3. INSPECT BATTERY

4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSY

5. INSPECT SPARK PLUG (See page 18-3 )

6. 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 help on selecting the DATA LIST.

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:

INSPECT IGNITION TIMING


  1.  Remove the cylinder head cover No. 2.
  2.  Pull out the wire harness as shown in the illustration.

    Connect the clip of the timing light to the engine.

NOTICE: Use a timing light which can detect the first signal.

After checking, be sure to tape the wire harness.

  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: After engine rpm is kept at 1,000 to 1,300 rpm for 5 seconds, check that it returns to idle speed.

  1.  Remove the SST from the DLC3.

    SST 09843-18040

  2.  Check the ignition timing at idle.

    Ignition timing: 5 to 15 BTDC @ idle

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

8. INSPECT ENGINE IDLE SPEED

INSPECT ENGINE IDLE SPEED


(a) Warm up the engine.

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

  1.  Connect the hand-held tester to the DLC3.

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

  2.  Enter DATA LIST MODE on the hand-held tester.

    Idle speed: 610 to 710 rpm

NOTICE:

INSPECT ENGINE IDLE SPEED


(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.
  2.  Check the idle speed.

    Idle speed: 610 to 710 rpm

SST 09843-18030

9. INSPECT COMPRESSION

 INSPECT COMPRESSION


(a) Warm up and stop the engine.

(b) Disconnect the injector connectors.

(c) Remove the ignition coils.

(d) Remove the spark plugs.

(e) Check the cylinder compression pressure.

  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: 1,360 kPa (13.9 kgf/cm2, 198 psi)

Minimum pressure: 0.98 MPa (10 kgf/cm2, 142 psi)

Difference between each cylinder: 100 kPa (1.0 kgf/cm2, 14 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) Immediately check CO/HC concentration at idle and/or 2,500 rpm.

HINT:

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

  1.  Check A/F sensor operation (see page 12-3 ).
  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.  Leaky intake and exhaust valves
  3.  Leaky 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 pressure regulator
  • Defective ECT
  • Defective MAF meter
  • Faulty ECM
  • Faulty injectors
  • Faulty throttle position sensor
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Fan and generator v belt (2AZ-FE)
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