Diagnosis & Repair (With Hand-Held Tester)

WARNING: This page is about a different car, the 2003 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

For wiring diagram, see Fig 1. For wire color identification, see WIRE COLOR IDENTIFICATION table under COMPUTERIZED ENGINE CONTROLS. For diagnosis and repair, see Fig 2-Fig 6 .

Fig 1: Fuel Pump Control Circuit Wiring Diagram

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Fig 2: Diagnosis & Repair Of Fuel Pump Control Circuit (Step 1-4)

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Fig 3: Diagnosis & Repair Of Fuel Pump Control Circuit (Step 5-7)

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Fig 4: Diagnosis & Repair Of Fuel Pump Control Circuit (Step 8)

Fig 5: Diagnosis & Repair Of Fuel Pump Circuit (Step 9-10)

Fig 6: Diagnosis & Repair Of Fuel Pump Control Circuit (Step 11-12)