Landcruiser 4WD L6-4.5L (1FZ-FE) (1993)
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Turn the ignition switch ON.
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Measure the fuel pressure.
Fuel pressure: 265 - 304 kPa (38 - 44 psi)
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If pressure is high, replace the fuel pressure regulator.
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If pressure is low, check the following parts:
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Fuel hoses and connections.
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Fuel pump.
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Fuel filter.
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Fuel pressure regulator.
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Fuel pump relay.
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Fuel pump resistor.
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Injectors.
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Remove SST from the data link connector 1 (SST 09843-18020).
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Start the engine.
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Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
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Measure the fuel pressure at idle.
Fuel pressure: 265 - 304 kPa (38 - 44 psi)