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Test NS-3: Checking Fuel System

NOTE: If Powertrain Control Module (PCM) is replaced, PCM must be properly programmed. See POWERTRAIN CONTROL MODULE PROGRAMMING  under PROGRAMMING.
  1. Turn ignition on with engine off. Using scan tool, read Throttle Position (TP) sensor voltage. If TP sensor voltage is 1.5 volts or less, go to next step. If TP sensor voltage is more than 1.5 volts, ensure TP sensor connector is clean and properly connected. If TP sensor connector is okay, replace TP sensor. Perform TEST VER-1A  . If TP sensor connector is not clean or properly connected, repair as necessary. Perform TEST VER-1A  .
  2. Turn ignition off. Ensure throttle cables at throttle body are not holding the throttle open. If throttle cables are not holding throttle open, go to next step. If throttle cables are holding throttle open, repair components as necessary. Perform TEST VER-1A  .
  3. If vehicle is equipped with vehicle theft security system, go to next step. If vehicle is not equipped with vehicle theft security system, go to step  6 .
  4. Turn ignition on with engine off. Using scan tool, read vehicle theft security system status. If scan tool does not indicate FUEL IS ON, go to next step. If scan tool indicates FUEL IS ON, go to step  6 .
  5. 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.
  6. Turn ignition on with engine off. Using scan tool, actuate ASD fuel system test. Check for fuel pump operating sound at fuel pump. Fuel pump is located in the fuel tank. If fuel pump operates, go to next step. If fuel pump does not operate, perform TEST NS-4: FUEL PUMP INOPERATIVE  .
  7. Turn ignition off. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  procedure. Connect fuel pressure gauge to the fuel rail.
  8. Ensure fuel tank is at least 1/4 full. Turn ignition on with engine off. Using scan tool, actuate ASD fuel system test and note fuel pressure. Fuel pressure should be 43-53 psi (3.0-3.7 kg/cm2 ). If fuel pressure is within specification, go to next step. If fuel pressure is more than 53 psi (3.7 kg/cm2 ), perform NS-5: HIGH FUEL PRESSURE  . If fuel pressure is less than 43 psi (3.0 kg/cm2 ), perform NS-6: LOW FUEL PRESSURE  .
  9. Using scan tool, stop actuation of ASD fuel system test. Turn ignition off. Release fuel pressure. Remove test equipment. Attempt to start engine. If engine starts and stalls repeatedly, it may be necessary to check idle air control motor. If engine does not start and stop repeatedly, perform TEST NTC-4: CHECKING ENGINE MECHANICAL SYSTEMS  .
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