Fuel Pressure: Testing and Inspection

FUEL LINE PRESSURE INSPECTION [L3 WITH TC]

Low Pressure Line (From the Fuel Tank to the High Pressure Fuel Pump)

WARNING:
- Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death. Fuel can also irritate skin and eyes. To prevent this, always complete the "BEFORE SERVICE PRECAUTION". (See Before Service Precaution.)

CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting using cloth or soft brush, and make sure that it is free of foreign material.

1. Complete the "BEFORE SERVICE PRECAUTION". (See Before Service Precaution.)

2. Remove the battery cover. Removal and Replacement

3. Disconnect the negative battery cable.

CAUTION:
- The quick release connector may be damaged if the tab is turned too far. Do not turn the tab over the stopper.

4. Disconnect the quick release connector from the fuel tank. (See Service and Repair.)

5. Push the SST quick release connector into the fuel pipe and plastic fuel hose into the SST until a click is heard.

6. Turn the lever parallel to the hose of the SST as shown.






7. Start the fuel pump using the following procedure:
Using M-MDS
1 Connect the M-MDS to the DLC-2.





2 Start the fuel pump using the "FP" simulation function.

Without using M-MDS
1 Remove the fuel pump relay.






CAUTION:
- Be careful to short the specified terminal as shorting the wrong terminal of the main fuse block may cause a malfunction.
2 Using a jumper wire, short fuel pump relay terminals C and D and connect the negative battery cable to start the fuel pump.






8. Operate the fuel pump for 10 s.

9. Measure the fuel line pressure.

- If not as specified, inspect the following:

Zero or low
- FP circuit
- FP
- Fuel line (clogged)
- Fuel leakage inside pressure regulator

High
- Pressure regulator for high pressure cause

Fuel line pressure
- 410-490 kPa {4.2-4.9 kgf/cm2, 60-71 psi}

10. Turn the ignition switch to the LOCK position.

11. Measure the fuel hold pressure after 5 min.

- If not as specified, inspect the following:

- FP hold pressure
- Fuel injector for leakage
- Fuel line for improper routing, kinks or leakage

Fuel hold pressure
- More than 230 kPa {2.3 kgf/cm2, 33 psi}

12. Disconnect the SST.

13. Connect the quick release connector. (See Service and Repair.)

14. Complete the "AFTER SERVICE PRECAUTION". (See After Service Precaution)

High Pressure Line (From the High Pressure Fuel Pump to the Fuel Injector)

1. Inspect the fuel pressure sensor. (See Testing and Inspection.)

2. Inspect the high pressure fuel pump. (See High Pressure Fuel Pump Inspection.)