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Find the OBD port on the underside of the drivers-side dashboard near the steering column. Its the same size and shape as the end of the OBD-I code scanner.

Plug the scanner into this OBD port.

Put the key into the ignition and turn it to the "ON" position, but dont start the engine.

Wait for the scanner to turn itself on. Some code scanners have to be manually turned on, so you may have to find the "on/off" switch.

Select the command "Retrieve Codes" or something similar -- it varies by scanner brand -- and wait for the code scanner to carry out the command. Write the codes it retrieves down on a piece of paper.

Look up the codes in the scanners manual. Unplug the scanner from the port and have the vehicle serviced or repaired based on the diagnostic information obtained from the codes.

Position the new cylinder head gasket and dowel pins on the cylinder block. Always use a new gasket. Set the crankshaft to top dead center (TDC) position. Align the top dead center (TDC) mark on the crankshaft sprocket with chalk or a marker on the cylinder block.

Install the cylinder head on the block. Measure the diameter of each cylinder head bolt. If the diameter is less than 0.42-inch, replace the cylinder head bolt. Apply engine oil to the bolt threads and under the bolt heads for all of the cylinder head bolts.

Tighten the cylinder head bolts 29 foot-pounds, using a beam-type torque wrench. If you use a preset-type torque wrench, be sure to tighten slowly and do not over-tighten the bolts. If a bolt makes any noise while you are torquing it, loosen the bolt and re-tighten it from the beginning. After torquing, tighten all cylinder head bolts in two steps (90 degrees per step). If you are using a new cylinder head bolt, tighten the bolt an extra 90 degrees.

Install the rocker arm assembly. Connect the water bypass hose. Tighten the connecting pipe mounting bolt and brake booster vacuum line mounting bolts, and then install the harness holder on the bracket. Install the upper radiator hose and heater hose.

Connect the water bypass hose. Install the intake and exhaust manifolds. Install the cam chain. Attach the fuel feed hose. Adjust the valve clearance. Install the drive belt. Clean the battery posts and cable terminals with sandpaper, then assemble them and apply grease to prevent corrosion. After installation, check that all tubes, hoses and connectors are installed correctly. Refill the radiator with engine coolant, and bleed air from the cooling system with the heater valve open. Inspect the idle speed. Check the engine for leaks.

Remove the retaining bolt from the negative battery cable end where it meets the battery with a wrench. Remove the cable from the battery and isolate it from the battery terminals.

Locate the two electrical connectors on the rear of the alternator. Unplug the four-prong connector and set it aside. Remove the nut from the terminal on the back of the alternator then remove the battery wire from the terminal. Set the battery wire off to one side and thread the nut loosely onto the terminal for safekeeping.

Remove the lock nut on the upper mounting bolt at the front of the alternator with a socket and ratchet then slide the upper bolt out of the alternator.

Unscrew the lock nut on the lower mounting bolt with the socket and ratchet, push the alternator towards the engine and remove the belt from the pulley. Slide the lower mounting bolt out of the alternator and mounting bracket then lift the alternator out of the engine compartment.