B01982
LEXUS
Hand±Held
Tester
B01879
Ohmmeter54
B01880
5
4 Battery
± SFI (2JZ±GE)FUEL PUMP
SF±7
1473 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(f) Connect a LEXUS hand±held tester to the DLC3.
(See step 1 in check fuel pump operation (a) to (e))
(g) Measure the fuel pressure.
Fuel pressure:
304 ± 343 kPa (3.1 ± 3.5 kgf/cm
2, 44 ± 50 psi)
If pressure is high, replace the fuel pressure regulator.
If pressure is low, check the fuel hoses and connections, fuel
pump, fuel filter and fuel pressure regulator.
(h) Disconnect the LEXUS hand±held tester from the DLC3.
(i) Start the engine.
(j) Measure the fuel pressure at idle.
Fuel pressure:
304 ± 343 kPa (3.1 ± 3.5 kgf/cm
2, 44 ± 50 psi)
(k) Stop the engine.
(l) Check that the fuel pressure remains as specified for 5
minutes after the engine has stopped.
Fuel pressure: 147 kPa (1.5 kgf/cm
2, 21 psi) or more
If pressure is not as specified, check the fuel pump, pressure
regulator and/or injectors.
(m) After checking fuel pressure, disconnect the negative (±)
terminal cable from the battery and carefully remove SST
to prevent gasoline from splashing.
SST 09268±45014
(n) Reconnect the fuel inlet hose to the fuel pipe support with
2 new gaskets and the union bolt.
Torque: 29 N´m (300 kgf´cm, 21 ft´lbf)
(o) Reconnect the negative (±) terminal cable to the battery.
(p) Check for fuel leaks.
3. INSPECT FUEL PUMP
(a) Remove the rear seat cushion.
(b) Remove the 3 cap nuts and floor service hole cover.
(c) Disconnect the fuel pump & sender gauge connector.
(d) Using an ohmmeter, measure the resistance between ter-
minals 4 and 5.
Resistance: 0.2 ± 3.0 W at 20°C (68°F)
If the resistance is not as specified, replace the fuel pump.
(e) Inspect the fuel pump operation.
Connect the positive (+) lead from the battery to terminal
4 of the connector, and the negative (±) lead to terminal
5. Check that the fuel pump operates.
NOTICE:
These tests must be done quickly (within 10 seconds)
to prevent the coil burning out.
Keep the fuel pump as far away from the battery as
possible.
Always do the switching at the battery side.
