Test NS-2A: Checking Fuel System
- Turn ignition on, with engine off. Using scan tool, actuate ASD fuel system test. Using a mechanic's stethoscope, listen for fuel pump operation at fuel tank. If fuel pump operation can be heard, stop ASD fuel system test and go to next step. If fuel pump operation cannot be heard, stop ASD fuel system test. Perform TEST NS-5A: CHECKING FUEL PUMP
.
- Ensure throttle cable is not holding throttle open. Repair throttle cable as necessary. Perform TEST VER-1A. If throttle cable is okay, go to next step.
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE
.
- Turn engine off. Release fuel pressure. Connect fuel pressure gauge to fuel rail. Turn ignition on, with engine off. Using scan tool, actuate ASD fuel system test. Allow fuel pressure gauge to stabilize. Stop ASD fuel system test. If fuel pressure is more than 54.2 psi (3.96 kg/cm2
), replace fuel filter/pressure regulator. Perform TEST VER-1A. If fuel pressure is 54.2 psi (3.96 kg/cm2
) or less, go to next step.
- Turn ignition off. If fuel pressure is less than 44.2 psi (3.23 kg/cm2
), perform TEST NS-4A: REPAIRING LOW FUEL PRESSURE. If fuel pressure is 44.2 psi (3.23 kg/cm2
) or more, go to next step.
- Ensure ignition is off. Attempt to start engine. If engine starts and stalls, perform TEST NS-7A: CHECKING IDLE AIR CONTROL MOTOR
. If engine does not start and stall, go to next step.
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION
. For circuit identification and wiring diagram, see WRANGLER
wiring diagram in WIRING DIAGRAMS article.
- Turn ignition on, with engine off. Using scan tool, actuate any fuel injector. Listen for fuel injector operation. If fuel injector is operating, perform TEST NS-3A: CHECKING ENGINE MECHANICAL SYSTEM. If fuel injector is not operating, repair open ASD output circuit to fuel injectors. Perform TEST VER-1A.