Test NS-3: Checking Fuel System

NOTE: Possible causes are: defective Throttle Position (TP) sensor, throttle stuck open or defective Powertrain Control Module (PCM).

NOTE: After making any repair during this testing procedure, perform TEST VER-1A: NO START VERIFICATION .

Turn ignition on. Using scan tool, read Throttle Position (TP) sensor voltage. If voltage is less than 1.5 volts, go to next step. If voltage is 1.5 volts or more, disconnect TP sensor connector. Inspect harness connector and clean/repair as necessary. If connector is okay, replace TP sensor.
Turn ignition off. Ensure throttle cable is not holding throttle open. If throttle cable is not holding throttle open, go to next step. If throttle cable is holding throttle open, repair as necessary.
If vehicle is not equipped with a factory theft security system, go to next step. If vehicle is equipped with a factory theft security system, go to step 6 .
Turn ignition on. Using scan tool, observe theft system status. If scan tool does not display fuel is ON, go to next step. If scan tool displays fuel is ON, go to step 6 .
Problem exists in the vehicle anti-theft system. Diagnose and repair vehicle anti-theft system as necessary. See appropriate ANTI-THEFT SYSTEMS article in ACCESSORIES & EQUIPMENT.
Turn ignition on. Using scan tool, actuate ASD fuel system test and check for fuel pump operation. If fuel pump is operating, go to next step. If fuel pump is not operating, repair fuel pump circuit. See TEST NS-4: FUEL PUMP INOPERATIVE .
Turn ignition off. Remove fuel pump relay from Power Distribution Center (PDC). PDC is located in engine compartment, next to air cleaner. See Figure . Start engine and run until engine stalls (removing fuel pump relay will set a DTC). Connect Fuel Pressure Gauge (C-4799-B) to fuel rail. Install fuel pump relay. Turn ignition on. Using scan tool, actuate ASD fuel system test. Observe and record fuel pressure. If fuel pressure is more than 46-51 psi (3.2-3.6 kg/cm² ), go to next step. If fuel pressure is less than 46-51 psi (3.2-3.6 kg/cm² ), go to TEST NS-5: HIGH FUEL PRESSURE .
Turn ignition off. Observe fuel pressure gauge. If fuel pressure is not less than 46-51 psi (3.2-3.6 kg/cm² ), go to next step. If fuel pressure is less than 46-51 psi (3.2-3.6 kg/cm² ), go to TEST NS-6: LOW FUEL PRESSURE .
Attempt to start vehicle. If vehicle repeatedly started and stalled, go to TEST NTC-8: CHECKING IDLE AIR CONTROL MOTOR . If engine does not repeatedly start and stall, go to TEST NTC-4: CHECKING ENGINE MECHANICAL SYSTEMS .