Preparation

1. The Maxima engine is transverse mounted and rotated 90 degrees clockwise.

2. Record the radio presets.

3. Open the hood and protect the fenders with fender covers.

4. Release the fuel pressure:

A. Remove the fuel pump fuse.

B. Start the engine and let it run until the engine stalls. Turn the ignition switch to "on" and crank the engine several times. This will ensure that no fuel pressure is remaining in the fuel rail. With the key off, reinstall the fuel pump fuse.

C. Connect a fuel pressure gauge to the engine side of the fuel filter to test the function of the fuel pressure regulator.

*D. Start the engine and read the fuel pressure at idle. Record this reading on the repair order. With the vacuum hose removed, the pressure should be less than 45 psi. If the pressure rises above 45 psi, you will need to replace the fuel pressure regulator and check fuel return lines for obstruction later in this procedure.

NOTE:
Damp fuel hoses/fuel pressure regulator may give the impression that the fuel pressure regulator is leaking fuel, however, most incidents are caused by a leaking fuel hose, not the fuel pressure regulator. If the fuel pressure regulator is suspected of leaking, remove the vacuum hose and inspect for fuel in the vacuum hose. Replace the fuel pressure regulator if fuel is found in the vacuum hose.

E. Remove the fuel pump fuse and release the fuel pressure following the procedure in step "4B" above.

F. Remove the fuel pressure gauge.

NOTE:
This may trigger Code 22 in ECCS self diagnosis. Be sure to clear all codes from the ECCS memory before releasing the vehicle to the customer.

G. DISCONNECT THE NEGATIVE BATTERY CABLE.

*NOTE:
The injector circuit has battery voltage applied regardless of ignition switch position. Damage to injectors may occur if the battery is left connected.