Pressure Regulator Control Inspection

PRESSURE REGULATOR CONTROL INSPECTION (ATX)

WARNING: Fuel line spills and leaks are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line Safety Procedures".




1. Install the fuel pressure gauge.
2. Measure the fuel pressure under the following conditions.




3. If the fuel pressure is not within the specification, carry out either Inspection 1 or Inspection 2.

Inspection 1

1. Stop the engine.
2. Connect the SSTs (NGS tester) to the data link connector 2.
3. Verify that diagnostic trouble code No. P1250 is not displayed. If code No. P1250 is shown, carry out troubleshooting of the code No. P1250.
4. Start the engine and run it at idle.




5. Select the "SIMULATION TEST" function on the NGS tester display.
6. Turn the PRC solenoid valve from OFF to ON by using the "PRCV" and check if the fuel pressure changes.
7. If the pressure changes, check the following PIDs:
(1) ECT
(2) IAT
(3) TPV
8. If the pressure does not change, do as follows.
(1) Stop the engine.
(2) Turn the ignition switch to ON.
(3) Turn the PRC solenoid valve from OFF to ON by using the "PRCV" and check if the operation sound of the valve is heard.
(1) If the operation sound is heard, check the pressure regulator.
(2) If the operation sound is not heard, check the PRC solenoid valve.

Inspection 2

1. Stop the engine.
2. Connect the SSTs (NGS tester) to the data link connector-2.
3. Verify that diagnostic trouble code No. P1250 is not displayed. If code No. P1250 is shown, carry out troubleshooting of the code No. P1250.




4. Select the "PID/DATA MONITOR AND RECORD" function on the NGS tester display.
5. Select the "PRCV" and verify that the PRC solenoid valve is OFF.
6. If the PRC solenoid valve is ON, check the following PIDs:
- ECT
- IAT




7. Select the SIMULATION TEST function on the NGS tester display.
8. Turn the PRC solenoid valve from OFF to ON using the "PRCV" and check if the operation sound of the valve is heard.
(1) If the operation sound is heard, check the following.
Loose or damaged vacuum hose between the pressure regulator, PRC solenoid valve, and intake manifold.
(2) If the operation sound is not heard, check the following:
- PRC solenoid valve.