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
(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:
HINT:
- After installing the drive belt, check that it fits properly in
the ribbed grooves. Check that the belt has not slipped
out of the groove on the bottom of the crank pulley with
your hand.
- "New belt" is a belt which has been used for less than 5
minutes on a running engine.
- "Used belt" is a belt which has been used on a running engine
for 5 minutes or more.
- After installing a new belt, run the engine for approximately
5 minutes and then recheck the tension.
7. INSPECT IGNITION TIMING
(a) Warm up the engine.
(b) When using the hand-held tester:
Check the ignition timing.
- Connect the hand-held tester to the DLC3.
- 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.
(c) When not using the hand-held tester:
Check the ignition timing.
- Using SST, connect terminals 13 (TC) and 4 (CG)
of the DLC3.
SST 09843-18040
NOTICE:
- Confirm the terminal numbers before connecting
them. Connection with a wrong terminal can damage
the engine.
- Turn off all electrical systems before connecting the
terminals.
- Perform this inspection after the cooling fan motor is
turned off.
- Remove the V-bank cover (see page 14-149 ).
- Pull out the black lead wire harness as shown in the
illustration.
- Connect the tester terminal of the timing light to the
engine.
NOTICE:
Use a timing light which detects the first signal.
- 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.
- Remove the SST from the DLC3.
- Check the ignition timing at idle.
Ignition timing: 7 to 24 BTDC @ idle
- Confirm that the ignition timing moves to the advanced
angle side when the engine rpm is increased.
- Remove the timing light.
8. INSPECT ENGINE IDLE SPEED
(a) Warm up the engine.
(b) When using the hand-held tester:
Check the idle speed.
- Connect the hand-held tester to the DLC3.
- Enter DATA LIST MODE on the hand-held tester.
Idle speed: 650 to 750 rpm
NOTICE:
- When checking the idle speed, the transmission
should be in the neutral position.
- Check the idle speed with the cooling fan off.
- Switch off all accessories and air conditioning before
connecting the hand-held tester.
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.
- Using SST, connect tachometer tester probe to terminal
9 (TAC) of the DLC3.
SST 09843-18030
- 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.
(f) Check the cylinder compression pressure.
SST 09992-00500
- Insert a compression gauge into the spark plug
hole.
- Fully open the throttle.
- 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:
- 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 as quickly as possible.
- 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, the piston rings
and/or cylinder bore may be worn or damaged.
- If pressure stays low, a valve may be stuck or seated improperly,
or there may be leakage in the gasket.
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.
- Check A/F sensor operation (see page 05-649 ).
- See the table below for possible causes, and then inspect and
repair.
CO |
HC |
Problems |
Causes |
Normal |
High |
Rough idle |
- Faulty ignitions:
- Incorrect timing
- Fouled, shorted or improperly gapped plugs
- Incorrect valve clearance
- Leaks in intake and exhaust valves
- Leaks in cylinders
|
Low |
High |
Rough idle
(fluctuating HC reading) |
- Vacuum leaks:
- PCV hoses
- Intake manifold
- Throttle body
- Brake booster line
- Lean mixture causing misfire
|
High |
High |
Rough idle
(black smoke from exhaust) |
- Restricted air filter
- Plugged PCV valve
- Faulty SFI system:
- Faulty fuel pressure regulator
- Defective ECT sensor
- Defective MAF meter
- Faulty ECM
- Faulty injectors
- Faulty throttle position sensor
|
COMPONENTS
OVERHAUL
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(a) Using a dial indicator, measure the thrust clearance while
moving the connecting rod back and forth.
Standard thrust cle ...
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1. REMOVE FRONT WHEEL RH
2. REMOVE ENGINE UNDER COVER NO.1
3. REMOVE FRONT FENDER APRON SEAL RH
4. REMOVE V (COOLER COMPRESSOR TO CRANKSHAFT PULLEY) BELT NO.1
(a) Loosen bolts A a ...
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