Fuel Pressure: Testing and Inspection

FUEL PRESSURE INSPECTION

CHECK FUEL PRESSURE
(a) Check that the battery positive voltage is above 12 volts.
(b) Disconnect the negative (-) terminal cable from the battery.





(c) Remove the union bolt and 2 gaskets and disconnect the fuel inlet pipe from the delivery pipe.

HINT:
- Put a suitable container or shop rag under the delivery pipe.
- Slowly loosen the union bolt.





(d) Install the fuel inlet pipe and SST (pressure gauge) to the delivery pipe 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.
(g) Turn the ignition switch ON and TOYOTA hand-held tester main switch ON.

NOTICE:
Do not start the engine.

(h) Select the active test mode on the TOYOTA hand-held tester.
(i) Please refer to the TOYOTA hand-held tester operator's manual for further details.
(j) If you have no TOYOTA hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector.
(k) Reconnect the negative (-) terminal cable to the battery.
(l) Turn the ignition switch ON.
(m) Measure the fuel pressure.
Fuel pressure:
265 - 304 kPa (2.7 - 3.1 kgf/sq.cm, 38 - 44 psi)
If pressure is high, replace the fuel pressure regulator. If pressure is low, check these parts:
- Fuel hoses and connections
- Fuel pump
- Fuel filter
- Fuel pressure regulator
- Injectors
(n) Remove the TOYOTA hand-held tester.
(o) Start the engine.
(p) Measure the fuel pressure at idle.
Fuel pressure:
206 - 255 kPa (2.1 - 2.6 kgf/sq.cm, 31 - 37 psi)
If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
(q) Stop the engine.
(r) 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 injector.
(s) 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
(t) Reconnect the fuel inlet pipe to the delivery pipe with 2 new gaskets and the union bolt.

Torque: 29 N.m (300 kgf.cm, 22 ft.lbf)

(u) Reconnect the negative (-) terminal cable to the battery.
(v) Check for fuel leakage.