System Diagram

WARNING: This page is about a different car, the 2011 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

ELECTRICAL CONTROL DIAGRAM

Fig 2: Fuel System Electrical Control Diagram
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HIGH PRESSURE SIDE FUEL SYSTEM WIRING DIAGRAM

Fig 3: Identifying High Pressure Side Fuel System Wiring Diagram (1 Of 2)
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Fig 4: High Pressure Side Fuel System Wiring Diagram From Battery
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LOW PRESSURE SIDE FUEL SYSTEM WIRING DIAGRAM

Fig 5: Low Pressure Side Fuel System Wiring Diagram
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COLD START INJECTOR CIRCUIT DESCRIPTION
1. The cold start injector is attached to the intake air surge tank. The cold start injector is designed to improve the ability of the engine to perform a cold start. It operates when the engine coolant temperature is -12°C (10°F) or less, the engine speed is 400 rpm or less, and the starter signal is on.