Fuel Pressure Test

FUEL LINE PRESSURE INSPECTION[LF, L3]

WARNING: Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can ignite and cause serious injury or death and damage. To prevent this, complete the following inspection with the engine stopped.

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See BEFORE SERVICE PRECAUTIONS, L3].) Before Service Precaution
2. Disconnect the negative battery cable.
3. Disconnect the quick release connector (in the engine compartment).




4. Turn the lever of the SST parallel to the hose as shown in the figure.
5. Insert the SST quick release connector into the fuel pipe until a click is heard.
6. Verify that the quick release connector is firmly connected by pulling it by hand.
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 within the specification, inspect the following:
If it less than the specification:
- Fuel pump unit
- Fuel line leakage

If it exceeds the specification:
- Pressure regulator

Fuel pressure (Reference)
350-410 kPa {3.57-4.18 kgf/cm2, 50.8-59.4 psi}

10. Stop the fuel pump using the following procedure: Using M-MDS
1. Stop the fuel pump using the "FP" simulation function.

Without using M-MDS
1. Disconnect the negative battery cable to stop the fuel pump.

11. Measure the fuel hold pressure after >1m5 min.>0m
- If not within the specification, inspect the following:
- Fuel line for clogging or leakage

Fuel hold pressure (Reference)
250 kPa {2.55 kgf/cm2, 36.2 psi} or more

12. Disconnect the SST.
13. Connect the quick release connector.
14. Inspect all related parts by performing "AFTER SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTIONS[LF, L3].) After Service Precaution