A - General Information

1. System Diagram of SULEV Engine.





2. ADDED OR CHANGED COMPONENTS OF SULEV ENGINE.

3. MAINTENANCE TIPS FOR GASKETS, FUEL INJECTOR GROMMET AND 0-RING.

Gasket

1. Cylinder Head Cover Gasket.

NOTE:
After 105,000 miles or 84 months, inspect every 15,000 miles or 12 months. Check the contact surface between the head cover and head for oil leaks and replace the gasket with a new one, if necessary. Remove the upper timing belt cover and check the engine parts including the cam cap for oil leaks.

2. Oil Pan Liquid Gasket.

NOTE:
After 105,000 miles or 84 months, inspect the oil pan mounting surface for oil leaks every 15,000 miles or 12 months.

3. Intake Manifold Gasket

Replace the gasket with a new one at its replacement interval.





Grommet and 0-ring of Injector

NOTE:
Replace every 100,000 miles. If the injector is removed for inspection, the injector grommet and 0-rings must be replaced with new parts.








Grommet and 0-Ring Part Numbers

4. SERVICE STANDARDS





^ Specification





^ Tightening Torque





^ Labor Op-Codes





5. CVVT (CONTINUOUSLY VARIABLE VALVE TIMING) SYSTEM





The CVVT unit is mounted on the exhaust camshaft and controls the intake valve timing by advancing and retarding the intake camshaft in relation to the exhaust camshaft. The Powertrain Control Module (PCM) controls the amount of timing advance up to 40° (crank angle) 20° (cam angle) depending on engine load and speed. The three main advantages of the CVVT system are:





1. Improved performance at high rpm and increased torque at low rpm through increased volumetric and thermodynamic efficiencies.

2. Improved fuel economy due to better cylinder charge achieved through increased valve overlap.

3. Reduced NOx emissions due to the EGR effect created by optimizing valve overlap.





The CVVT is a vane style unit operated by engine oil. The engine oil specifications have changed specifically for the CVVT unit (Refer to table shown) and are required for the unit to operate properly. Engine oil is diverted past the oil temperature sensor (located on the exhaust side to the right of the # 4 exhaust port), and then through an oil control valve filter (located on the flywheel end of the cylinder head) and then directed to the oil control valve (located on the exhaust side between the # 4 cylinder and the timing chain). The oil control valve is a pulse width modulated solenoid valve controlled by the PCM.








The PCM monitors engine coolant temperature sensor (ECT), intake air temperature sensor (IAT), mass air flow sensor (MAF), crank angle sensor (CKP) and the oil temperature sensor (OTS). When all the sensors meet the criteria to activate the CVVT, the PCM controls the duty cycle of the oil control valve based on engine load and speed. At idle, the CVVT unit is in its fully retarded (default) position. High load at high RPM or part load conditions will advance the intake camshaft timing.

6. ZERO EVAPORATIVE EMISSIONS SYSTEM

The evaporative emissions system has been revised and is now a Zero Emissions Evaporative System. Components generally remain the same; however, joint locations have been reduced, and several components have been integrated.

Components:

a. Fuel Tank - The fuel tank includes an integrated (non-serviceable) fill vent valve, fuel cut (rollover) valve, two way valve and liquid vapor separator.

b. Two 1/4" check valves have been installed in the fuel drain back nipples (one nipple from the filler neck, one nipple from the fuel tank pressure sensor tee). The check valves may remain in the hose when the hose is removed. Be sure the check valve is reinstalled to the tank.

c. Fuel Pump - The fuel pump assembly is new and now includes a secondary 0-ring for sealing the fuel pump to the fuel tank (in addition to the standard packing seal). The number of mounting bolts have increased from 8 to 9.





d. An additional charcoal canister is installed to work in conjunction with the main canister assembly. The secondary canister is located next to the main canister where the air filter used to be located.

e. The canister close valve Air Filter has now been relocated to the left rear wheel well area.

















7. DIAGNOSTIC TROUBLE CODE LIST