Inspecting Fuel System

WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE .

Ensure throttle cables are not holding throttle open. If throttle is held open, repair as required. Perform TEST VER-1. If throttle is not held open, using scan tool, read Throttle Position (TP) sensor voltage.
If voltage is less than 1.5 volts, go to next step. If voltage is more than 1.5 volts, disconnect TP sensor connector. Inspect terminals. Repair as required. Perform TEST VER-1 . If terminals are okay, replace TP sensor. Perform TEST VER-1.
If vehicle is not equipped with factory vehicle theft alarm, go to next step. If vehicle is equipped with factory vehicle theft alarm, read theft alarm status using scan tool. If scan tool displays FUEL ON, go to next step. If scan tool does not display FUEL ON, see TESTS W/CODES - BODY CONTROL COMPUTER article in ENGINE PERFORMANCE.
Using scan tool, actuate fuel system. Listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, go to TEST NS-5A . If fuel pump operation can be heard, turn ignition off.
Ensure fuel tank is at least 1/4 full. Release fuel pressure. Install a fuel pressure gauge in fuel supply line. Turn ignition on. Using scan tool, actuate fuel system. Read fuel pressure gauge reading.
If pressure is more than 53 psi (3.7 kg/cm² ), go to TEST NS-4B . If fuel pressure is less than 53 psi (3.7 kg/cm² ), go to next step.
If fuel pressure is less than 43 psi (3 kg/cm² ), go to TEST NS-4A . If fuel pressure is more than 43 psi (3 kg/cm² ), go to next step.
If vehicle initially started and stalled repeatedly, go to TEST NS-7A . If vehicle did not initially start and stall repeatedly, go to TEST NS-3A.