Engine

3UZ-FE ENGINE MECHANICAL: ENGINE: ON-VEHICLE INSPECTION

1. CHECK IGNITION TIMING

(a) When using the Techstream:

(1) Warm up the engine.

(2) Turn the ignition switch OFF.

(3) Connect Techstream to the DLC3.

(4) Turn the ignition switch ON.

(5) Turn the tester ON.

(6) Enter the following menus:

Select: Powertrain / Engine and ECT / Data List / IGN Advance.

Ignition timing:

8 to 12° BTDC @ idle (Transmission in neutral)

2. CHECK ENGINE IDLE SPEED

(a) When using the Techstream:

(1) Warm up the engine.

(2) Connect Techstream to the DLC3.

(3) Turn the tester ON.

(4) Enter the following menus:

Select: Powertrain / Engine and ECT / Data List / Engine Speed.

(5) Inspect the engine idle speed.

Idle speed:

700 to 800 rpm (Transmission in neutral position)

NOTICE:
* Check the idle speed with the cooling fan off.
* Switch off all accessories and A/C before connecting the Techstream.
(5) If the idle speed is not as specified, check the air intake system.

3. CHECK COMPRESSION

(a) Remove the V-bank cover.

(b) Remove the air cleaner inlet and intake air pipe.

(c) Disconnect the throttle control motor connector.

(d) Remove the oil level gauge guide.

(e) Remove the 8 ignition coils.

(f) Remove the 8 spark plugs.

(g) Disconnect the 8 injector connectors.





(h) 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.

Standard compression pressure:

1,226 kPa (12.5 kgf/cm2, 178 psi) or more

Minimum pressure:

981 kPa (10.0 kgf/cm2, 142 psi)

Difference between each cylinder:

98 kPa (1.0 kgf/cm2, 14 psi)

NOTICE:
* Always use a fully charged battery to obtain an 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.
(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, 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.
(i) Connect the 8 injector connectors.

(j) Install the 8 spark plugs.

(k) Install the 8 ignition coils.

(l) Install the oil level gauge guide.

(m) Connect the throttle control motor connector.

(n) Install the air cleaner inlet and intake air pipe.

(o) Install the V-bank cover.

4. CHECK CO/HC





(a) Start the engine.

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

(c) Insert a 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
* Complete the measurement within 3 minutes.
* Check regulations in your area when performing 2 mode CO/HC concentration testing (check at both idle speed and at 2,500 rpm).
(e) If the CO/HC concentration does not comply with regulations, perform troubleshooting in the order given below.

(1) Check the heated oxygen sensor operation P0130.

(2) See the table below for possible causes, and then inspect and repair.