Fuel Pressure: Testing and Inspection
FUEL PRESSURE INSPECTION
CHECK FUEL PRESSURE
(a) Check the battery voltage is above 12 V.
(b) Disconnect the negative (-) terminal cable from the battery.
(c) Remove the union bolt and 2 gaskets, disconnect the fuel inlet hose from the fuel filter.
CAUTION:
- Put a suitable container or shop towel under the fuel filter.
- Slowly loosen the union bolt.
(d) Install the fuel inlet hose and SST (pressure gauge) to the fuel filter with the 3 gaskets and SST (union bolt). SST 09268-45012
Torque: 29 N.m (300 kgf.cm, 22 ft.lbf)
(e) Wipe off any splattered gasoline.
(f) Connect the TOYOTA hand-held tester to the DLC3.
(1) Turn the ignition switch ON and TOYOTA hand-held tester main switch ON.
NOTICE: Do not start the engine.
(2) Select the ACTIVE TEST mode on the TOYOTA hand-held tester.
(3) Please refer to the TOYOTA hand-held tester operator's manual for further details.
(4) If you have no TOYOTA hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector.
(g) Reconnect the negative (-) terminal cable to the battery.
(h) Turn the ignition switch ON.
(i) Measure the fuel pressure.
Fuel pressure: 226-275 kPa (2.3-2.8 kgf/Sq. cm, 33-40 psi)
If pressure is high, replace the fuel pressure regulator. If pressure is low, check the following parts:
(1) Fuel hoses and connections
(2) Fuel pump
(3) Fuel filter
(4) Fuel pressure regulator
(j) Remove the TOYOTA hand-held tester from the DLC3.
(k) Start the engine.
(l) Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
(m) Measure the fuel pressure at idle.
Fuel pressure: 226 - 275 kPa (2.3-2.8 kgf/Sq. cm, 33-40 psi)
(n) Reconnect the vacuum sensing hose to the fuel pressure regulator.
(o) Measure the fuel pressure at idle.
Fuel pressure: 167-216 kPa (1.7 - 2.2 kgf/Sq. cm, 24-31 psi)
If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
(p) Stop the engine.
(q) Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.
Fuel pressure: 147 kPa (1.5 kgf/Sq. cm, 21 psi) or more
If pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.
(r) After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing. SST 09268-45012
(s) Reinstall the fuel inlet hose to the fuel filter with 2 new gaskets and the union bolt.
Torque: 29 N.m (300 kgf.cm, 22 ft.lbf)
(t) Reconnect the negative (-) terminal cable to the battery.
(u) Check for fuel leaks.
3. TAKE OUT FLOOR CARPET
4. REMOVE SPARE WHEEL COVER
5. REMOVE SPARE WHEEL
6. REMOVE SERVICE HOLE COVER
7. DISCONNECT FUEL PUMP & SENDER GAUGE CONNECTOR
8. INSPECT FUEL PUMP RESISTANCE
Using an ohmmeter, measure the resistance between terminals 4 and 5.
Resistance: 0.1 - 3.0 Ohms at 20°C (68°F)
If the resistance is not as specified, replace the fuel pump, lead wire or fuel pump bracket.
9. INSPECT FUEL PUMP OPERATION
Connect a tester lead from terminal 4 of the connector to the positive (+) terminal of the battery; connect another tester lead from terminal 5 of the connector to the negative (-) terminal of the battery.
NOTICE:
- These tests must be performed quickly (within 10 seconds) to prevent the coil from burning out.
- Keep the fuel pump as far away from the battery as possible.
- Always connect or disconnect at the battery. If operation is not as specified, replace the fuel pump, lead wire or fuel pump bracket.
10. RECONNECT FUEL PUMP & SENDER GAUGE CONNECTOR
11. INSTALL SERVICE HOLE COVER
12. INSTALL SPARE WHEEL
13. INSTALL SPARE WHEEL COVER
14. INSTALL FLOOR CARPET