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Test NTC-16: Checking Fuel Pressure

NOTE: Possible causes are: fuel filter restricted, fuel line kinked or restricted or fuel pump and filter defective.
  1. Check fuel pressure. Turn ignition off. Release fuel pressure. Remove fuel pump relay from Power Distribution Center (PDC). Start engine and run until engine stalls (removing fuel pump relay will set a DTC). On 2.0L/2.4L engines, connect Fuel Pressure Gauge (C-4799-B) to fuel rail. On 2.5L engine, use Adapter (6539) between fuel rail and chassis supply line, then connect Fuel Pressure Gauge (C-4799-B) to adapter. On all vehicles, reinstall fuel pump relay. Turn ignition on. Using scan tool, actuate ASD fuel system test. Observe and record fuel pressure. If fuel pressure is within 43-53 psi (3.0-3.7 kg/cm2 ), go to next step. If fuel pressure is less than 43-53 psi (3.0-3.7 kg/cm2 ), go to TEST NS-6: LOW FUEL PRESSURE  . If fuel pressure is more than 43-53 psi (3.0-3.7 kg/cm2 ), go to TEST NS-5: HIGH FUEL PRESSURE  .
  2. Start engine. While observing fuel pressure gauge, snap throttle open raising engine speed to more than 3000 RPM. If fuel pressure dropped to less than 35 psi (2.5 kg/cm2 ), go to next step. If fuel pressure did not drop to less than 35 psi (2.5 kg/cm2 ), test is complete.
  3. Turn ignition off. Inspect chassis fuel line to engine for kinks or restrictions. If fuel line is not okay, go to next step. If fuel pressure is okay, release fuel pressure and repair fuel line as necessary. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  4. Release fuel pressure. Remove fuel filter. Inspect fuel filter for a restriction. If fuel filter is okay, go to next step. If fuel filter is not okay, replace fuel filter. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  5. If no other potential causes are remaining, fuel pump is assumed to be defective. Replace fuel pump. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
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