Test NS-2A - Checking Fuel System

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Ensure throttle cables are not holding throttle open. Repair throttle as necessary and perform TEST VER-1A . If throttle is okay, go to next step.
Using scan tool, actuate fuel system. Using a stethoscope, listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, perform TEST NS-5A . If fuel pump operation can be heard, turn ignition off and go to next step.
WARNING: Fuel system may be under pressure. Release pressure before connecting fuel pressure gauge. See FUEL PRESSURE RELEASE .
Turn ignition off. Release fuel pressure. Ensure fuel tank is at least 1/4 full. Connect a fuel pressure gauge to fuel rail. Go to next step.
Turn ignition on. Using scan tool, actuate fuel system. Read fuel pressure gauge. If fuel pressure is more than 44 psi (3.1 kg/cm² ), replace fuel filter/regulator and primary fuel filter, and perform TEST VER-1A . If fuel pressure is less than 34 psi (2.3 kg/cm² ), perform TEST NS-4A . If fuel pressure is 34-44 psi (2.3-3.1 kg/cm² ) and vehicle initially started and stalled repeatedly, perform TEST NS-7A . If vehicle did not initially start and stall repeatedly, perform TEST NS-3A .